Free Online Tools

✒️

Handwriting Generator

Convert typed text into an image with handwriting appearance. Useful for adding a personal touch to digital work.

📋

Resume Generator

Fill a simple printable A4 CV from a form with personal data, education and experience.

🔖

Favicon Generator

Generate a favicon from text/emoji in all common sizes (16, 32, 48, 64, 192, 512). PNG download.

⚡

Pix QR Code Generator

Generate Brazilian Pix QR Code (BR Code), static or with amount, from Pix key, name, city and identifier. Ready to scan.

📶

Wi-Fi QR Code

Generate a QR Code to auto-connect to a Wi-Fi network. Works with modern smartphones (iOS, Android) via camera scan.

📝

Promissory Note Generator

Generate a Brazilian promissory note from creditor, debtor, value and due date. Ready to print.

🧾

Receipt Generator

Generate a payment receipt from payer, payee, value and description. Printable A4.

🎲

Random Words Generator

Generate random words in Portuguese or English. Useful for brainstorming, games, UI tests and identifier generation.

📋

Batch CPF Generator

Generate multiple valid CPFs at once (up to 1000) for software testing. With or without formatting.

📋

Batch CNPJ Generator

Generate multiple valid CNPJs at once (up to 1000) for software testing. With or without formatting.

📜

NFe Key Generator

Generate structurally valid 44-digit NFe access keys (mod-11 DV) for software testing. For test environments only.

🪪

CPF Generator

Generate mathematically valid Brazilian CPF numbers for software testing and development. With or without formatting. For test use only.

📷

QR Code Generator

Generate QR Codes from any text, URL, email or phone number. Instant PNG download, processed directly in your browser.

🏢

CNPJ Generator

Generate mathematically valid Brazilian CNPJ numbers for software testing. With or without formatting. For test use only.

🆔

Alphanumeric CNPJ Generator

Generate valid Brazilian alphanumeric CNPJ numbers in the new Receita Federal format (IN RFB 2.119/2022), effective July 2026. Uses the official SERPRO algorithm. For test use only.

🪪

PIS/PASEP Generator

Generate mathematically valid Brazilian PIS/PASEP numbers for software testing. Follows the official check-digit algorithm. For test use only.

🚗

RENAVAM Generator

Generate mathematically valid Brazilian RENAVAM vehicle registration numbers for automotive software testing. Correct check digit. For test use only.

🗳️

Brazilian Voter ID Generator

Generate mathematically valid Brazilian voter ID (Título de Eleitor) numbers for software testing. Follows the TSE official algorithm. For test use only.

🚘

CNH Generator

Generate mathematically valid Brazilian driver's license (CNH) numbers for testing. Follows the DETRAN algorithm. For test use only.

💳

Credit Card Number Generator

Generate valid credit card numbers using the Luhn algorithm for e-commerce and payment testing. Supports Visa, MasterCard and Elo. For test use only.

📮

CEP Generator

Generate Brazilian postal codes (CEP) by state for software testing. Numbers within the real postal code ranges per UF. For test use only.

🪪

RG Generator

Generate mathematically valid Brazilian RG (identity) numbers in the São Paulo format for software testing. For test use only.

📜

Brazilian Certificate Number Generator

Generate valid Brazilian birth, marriage or death certificate numbers for software testing. Standard 32-digit CNJ format. For test use only.

🏦

Brazilian Bank Account Generator

Generate fictitious Brazilian bank account data (bank, branch, account number and check digit) for software testing.

🎲

Random Number Generator

Generate random numbers between a defined minimum and maximum. Option for unique numbers (no repetition) and configurable quantity.

📝

Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text for prototypes and layouts. Choose between paragraphs, sentences or words.

🚘

Brazilian License Plate Generator

Generate Brazilian vehicle license plates in the old format (AAA-0000) or Mercosul format (AAA-0A00). Random letters and numbers.

🎮

Username Generator

Generate creative nicknames for games, social networks and chats. Random combinations of adjectives and nouns.

👤

Name Generator

Generate random Brazilian names (male, female or both) for software testing and database population.

🏢

Company Data Generator

Generate fictitious company data (company name, CNPJ and type) for software testing. Mathematically valid CNPJ.

🪪

Person Data Generator

Generate complete fictitious person profiles: name, CPF, date of birth, CEP and phone number. Mathematically valid data for testing.

🏛️

Brazilian State Tax ID Generator

Generate valid Brazilian State Tax IDs (Inscrição Estadual) for SP, RJ, MG, RS, PR and BA. For fiscal software and SEFAZ integration testing.

🚗

Vehicle Data Generator

Generate complete fictitious vehicle data: make, model, year, color, license plate and valid RENAVAM. For automotive software and fleet system testing.

🖼️

Placeholder Image Generator

Generate placeholder image URLs with custom dimensions and colors for use in prototypes and layouts. Compatible with placehold.co.

🔑

UUID Generator

Generate random UUID v4 identifiers with one click. Copy individually or in bulk. Processed in the browser, no data sent to servers.

🍀

Mega-Sena Number Generator

Generate random number combinations for the Brazilian Mega-Sena lottery with 6 to 15 unique numbers between 1 and 60.

🔑

Token / API Key Generator

Generate cryptographically secure random tokens: hexadecimal, alphanumeric, Base58 or UUID. Ideal for API keys, secrets and session tokens.

🔢

PIN Generator

Generate random PINs (Personal Identification Numbers) with configurable length from 4 to 16 digits.

▐▌

Barcode Generator

Generate barcodes in CODE128, EAN-13, EAN-8, CODE39 and UPC formats. Export as PNG. Processed entirely in your browser.

🎨

Color Scheme Generator

Generate harmonic color palettes from a base color: complementary, analogous, triadic, tetradic and split-complementary. Copy HEX codes with one click.

🆔

NanoID / ULID Generator

Generate modern unique identifiers: NanoID (URL-safe, 21 chars by default) and ULID (time-sortable, 26 chars). Compact UUID alternatives for modern databases. Processed in the browser.

🔷

SVG Pattern Generator

Create repeatable SVG patterns for website backgrounds: dots, lines, checkerboard, grid, diagonal and hexagons. Customize colors and size. Copy the SVG code or CSS background-image.

🖧

MAC Address Generator

Generate random MAC addresses in multiple formats (colon, hyphen, Cisco dot) with known OUI prefixes (VMware, VirtualBox, Apple, Intel) or fully random. Everything in your browser.

🌐

IPv6 ULA Generator

Generate IPv6 ULA prefixes (Unique Local Addresses, fc00::/7) following RFC 4193 from a random Global ID. IPv6 equivalent of 192.168.x.x and 10.x.x.x networks. Everything in your browser.

🚪

Random Port Generator

Pick random TCP/UDP ports inside the ephemeral range (49152–65535) or in any custom interval. Avoids well-known ports reserved by IANA. Everything in your browser.

♟️

Checkerboard Pattern (SVG) Generator

Create checkerboard SVG patterns: square size, colors and dimensions. Vector output ready for backgrounds, transparency placeholders and mockups. Everything in your browser.

🌸

Haiku Generator

Pick random Portuguese haikus (5-7-5 syllable Japanese poems) from a curated list. Great for inspiration, creative prompts or simple appreciation. Everything in your browser.

🎲

Random String Generator

Generate customizable random strings — set the alphabet (A-Z, a-z, 0-9, hex, base32, base58, symbols), length and quantity. Useful for tokens, IDs and fixtures. Everything in your browser.

🆔

UUID v7 Generator

Generate UUID v7 — time-ordered UUIDs (48-bit timestamp ms + random). Ideal as primary key in databases. Everything in your browser.

❄️

Snowflake ID Generator

Generate Twitter Snowflake-style IDs — 64-bit (timestamp + machine ID + sequence). Unique, ordered and short. Everything in your browser.

👤

Identicon Generator

Generate Identicon avatars (GitHub style) from any text (email, username, hash). Deterministic — same input gives same image. Everything in your browser.

🟦

Favicon SVG Generator

Create a favicon.svg from an emoji or letter with configurable background color. Ready to drop into a <link rel="icon">.

🍎

Apple Touch Icon Generator

Generate apple-touch-icon.png at 180x180 from an emoji or text, with configurable background. Save directly from the page.

📚

ISBN Generator

Generate valid ISBN-10 and ISBN-13 numbers for testing, with correct check digit. Useful for testing validators.

🗞️

ISSN Generator

Generate valid ISSN codes (8 digits with mod-11 check digit) for testing.

📱

IMEI Generator (test)

Generate fictitious 15-digit IMEI with correct Luhn check digit. For testing only.

🚗

VIN Generator (test)

Generate Vehicle Identification Numbers passing the check-digit algorithm. For testing.

📦

tar Command Builder

Build tar commands (create, extract, list) with gz/bz2/xz/zst compression and exclusion patterns.

🎞️

ffmpeg Command Builder

Build common ffmpeg commands: convert format, compress, trim, extract audio, GIF and resize.

🔁

rsync Command Builder

Build rsync command with archive, compression, dry-run, exclusions, delete and remote SSH.

🔍

find Command Builder

Build find commands by name, type, size, mtime and -exec/-delete actions.

📤

curl Form Builder

Build curl commands with multipart -F or urlencoded -d, including @file fields with content type.

💬

Programmer Quote Generator

Random famous programmer quote generator. Useful for README epigraphs and slides.

👥

Random Groups Generator

Split a name list into N random balanced groups. Useful for class teams or events.

🥧

Pi to N decimals

Show π (pi) with up to 1000 decimal places. Useful for memorization practice.

🆔

CUID2 Generator

Generate CUID2 (collision-resistant unique ID v2) identifiers — short, safe, and optimized for URLs, databases and distributed systems.

🎟️

Coupon Code Generator

Generate random coupon codes in formats like AAAA-NNNN, AANN-AANN or custom — for promos, vouchers and disposable codes.

📅

Random Date Generator

Generate random dates within a defined range — useful for seeding test databases, app fixtures or mock spreadsheets.

🌍

Random Coordinate Generator

Generate random geographic coordinates (latitude and longitude) — globally valid or country-restricted. Useful for map fixtures and simulations.

🌐

Random IPv4 Generator

Generate random IPv4 addresses (public) — excludes private (10.x, 172.16-31.x, 192.168.x) and reserved (127.x, 169.254.x) ranges. For test fixtures.

🔢

Random Bytes Generator

Generate random bytes in hex, base64 or binary — using browser crypto.getRandomValues. For cryptographically secure keys, salts and tokens.

🎲

Random Emoji Generator

Generate a sequence of random emojis — pick theme (general, food, animals, sports) and quantity. For design, mockups and messages.

💳

JCB Card Generator (fake)

Generate fake JCB card numbers for testing (with valid Luhn). Development only — not accepted in real transactions.

💳

Diners Club Card Generator (fake)

Generate fake Diners Club card numbers (14 digits, BIN 36/300-305) with valid Luhn. For testing validation in development.

💳

American Express Card Generator (fake)

Generate fake American Express card numbers (15 digits, BIN 34/37) with valid Luhn. Validation testing only.

📮

Portugal Postal Code Generator (fake)

Generate Portuguese postal codes (####-### format, prefixes 1000–9999). For fixtures only — does not match real addresses.

📦

Correios Tracking Code Generator (fake)

Generate Brazilian Correios tracking codes (AA999999999BR with valid check digit). Testing only — not real shipments.

🎨

Random Color Generator

Generate random colors in hex, rgb, hsl. Useful for design inspiration.

⏱️

Random Timestamp Generator

Generate random Unix timestamps within a date range. Useful for test data.

🕒

Random Time Generator

Generate random times (HH:MM:SS) within a window.

🗺️

Random GPS Coordinate Generator

Generate random latitude/longitude inside a bounding box.

⚔️

RPG Character Generator

Random RPG character: name, class, race, attributes (simplified DnD 5e).

🦹

RPG Villain Generator

Random villain with epithet, motivation, secret weakness and ongoing plan.

☁️

AWS S3 Command Builder

Build aws s3 cp/sync/ls/rm commands with bucket, ACL, recursive and profile.

🚢

kubectl Command Builder

Build common kubectl commands with namespace, labels and output formats.

☸️

Kubernetes Deployment YAML Generator

Generate Kubernetes Deployment YAML with name, image, replicas, port, resources, env.

🔌

Kubernetes Service YAML Generator

Generate Kubernetes Service YAML (ClusterIP, NodePort, LoadBalancer).

🔮

Mystic Persona Generator

Random mystic persona: oracle/druid/alchemist with name, specialty and secret.

😎

Fun Username Generator

Combine adjective + noun + digits to generate fun usernames (e.g., FluffyOctopus42).

👤

Persona Generator

Generate UX/marketing personas with name, age, role, hobbies, pains and goals.

🏰

Fantasy City Generator

Random fantasy city: name, population, government, main landmark.

📖

Story Plot Generator

Random story plot with protagonist, antagonist, goal, obstacle and final change.

🌐

Network Topology Generator (ASCII)

Generate ASCII network topology (star, ring, mesh, bus) for N nodes.

🌳

Decision Tree Generator (ASCII)

Generate ASCII decision tree from indented bullet list (2 spaces = 1 level).

📊

Mermaid Flowchart Generator

Generate Mermaid flowchart code from "A → B" transition list.

➡️

Sequence Diagram Generator

Generate Mermaid sequenceDiagram from "actor → actor: message" pairs.

🧱

UML Class Diagram (Mermaid)

Build Mermaid classDiagram from a list of classes with attributes and methods.

🗃️

ER Diagram (Mermaid)

Generate Mermaid erDiagram from tables and foreign keys.

🔗

Graphviz DOT Generator

Generate Graphviz DOT from a list of edges; supports directed and undirected.

🛠️

Prisma Schema Generator

Generate Prisma schema with typed columns (Int, String, DateTime…) and default id.

🔀

git rebase Builder

Build git rebase commands with base, --interactive, --onto, --autosquash, --no-verify.

🖥️

tmux Command Builder

Build common tmux commands: new-session, attach, split, rename, kill, new-window.

🎯

Figlet-style ASCII Banner

Generate ASCII banner from short text (figlet-like big letters).

☁️

AWS IAM Policy Generator

Generate AWS IAM policy JSON (2012-10-17) from Effect, Actions and Resources.

⛵

Helm values.yaml Generator

Generate a minimal Helm values.yaml with replicaCount, image, service and resources.

🅰️

Ansible Task Generator

Generate Ansible YAML task with common modules (apt, copy, template, service, file).

🏗️

Terraform resource Generator

Generate a basic Terraform HCL resource with type, name and attributes.

🛡️

fail2ban jail.local Generator

Generate a fail2ban jail.local snippet with filter, action, maxretry, bantime.

🔱

Pulumi resource Generator (TS)

Generate TypeScript Pulumi resource boilerplate (AWS/AZURE/GCP) with name and props.

🌲

Cypress test skeleton

Generate Cypress test skeleton from URL, selector and expected text.

🃏

Jest test skeleton

Generate Jest test skeleton with describe, beforeEach and an example test.

⚡

Vitest test skeleton

Generate Vitest test skeleton (TS) with describe/it/expect.

🛡️

CSRF Token Generator

Generate random CSRF tokens (32 bytes) in hex or base64url using browser Crypto API.

🐘

PHP MVC Skeleton Generator

Generate minimal PHP MVC skeleton (Controller, Model, View) from a resource name.

📐

ASCII Wireframe Generator

Generate ASCII wireframes (header, sidebar, content, footer) for quick sketches.

📜

X.509 CSR Summary

Read PEM CSR text and identify BEGIN/END markers and approx base64 size.

🛡️

Shields.io README Badges

Generate common shields.io badges (build, license, version, downloads) for README.md.

📊

Markdown Comparison Table

Generate Markdown comparison table for tools/options and criteria.

❓

FAQ Accordion HTML Generator

Generate semantic HTML (details/summary) for FAQ Q&A pairs.

☑️

Markdown Checklist Generator

Convert a task list into Markdown checklist with - [ ] / - [x] (prefix "ok" to pre-check).

📝

Conventional Commit Builder

Build a Conventional Commits message (feat:, fix:, chore:) with optional scope and breaking.

📜

Keep a Changelog Generator

Generate a CHANGELOG.md in Keep a Changelog 1.1.0 format with all sections.

🪝

Git pre-receive hook

Generate bash pre-receive Git server hook with branch/author/size checks.

🪝

Git post-merge hook

Generate post-merge hook: reinstall deps when package-lock changes, update submodules.

🚀

AWS CLI EC2 Builder

Build aws ec2 commands (run/describe/terminate/start/stop) with parameters.

🍃

MongoDB find() Builder

Build a MongoDB find() with filter, projection and sort.

🌿

MongoDB aggregate() Builder

Build MongoDB aggregate() pipelines with $match, $group, $sort, $limit.

🔴

Redis CLI Builder

Build common redis-cli commands (SET, GET, EXPIRE, KEYS, HSET, INCR) with TTL.

🔎

Elasticsearch Query DSL Builder

Build Elasticsearch Query DSL (match, term, range, bool) in JSON.

💚

Vue Component (Composition API)

Generate Vue 3 Composition API component skeleton (<script setup>) with props/ref/computed.

🐚

Shellcheck Disable Builder

Generate shellcheck disable=SCxxxx comment with description for bash scripts.

⊞

CSS grid-template-areas Builder

Build CSS grid-template-areas visually with row/col counts and area names.

✂️

CSS clip-path Shape Generator

Generate CSS clip-path for common shapes: triangle, diamond, hexagon, star, arrow, circle, speech.

💧

SVG Blob Shape Generator

Generate random SVG blob shape with smooth Bezier curves.

🌊

SVG Wave Shape Generator

Build SVG wave shape with configurable amplitude/frequency/phase for landing page section dividers.

🌫️

SVG Noise Generator

Generate SVG with feTurbulence filter for noise/grain texture overlay.

🔳

CSS Repeating Pattern Generator

Generate CSS pure patterns (checker, stripes, dots, hex, waves) with repeating gradients.

⏳

Animated CSS Loader Generator

Generate full CSS for animated loaders: spinner, dots, progress bar, conic ring.

✨

CSS Glow Effect Generator

Generate CSS glow/neon effect with layered box-shadow / text-shadow.

💀

Skeleton CSS Loader Generator

Generate animated skeleton loader CSS (shimmer) for content placeholders.

🗃️

SQL CREATE TABLE Generator

Generate SQL CREATE TABLE from field list with types. Auto-adds id PK.

🔧

SQL ALTER TABLE Generator

Generate ALTER TABLE SQL: add/remove/rename columns, add indexes. Supports MySQL, Postgres, SQLite.

🟢

nginx server block Generator

Generate full nginx server block for PHP/Node site with proxy_pass, listen, server_name, root, gzip.

🪶

Apache VirtualHost Generator

Generate Apache 2.4 <VirtualHost> with ServerName, DocumentRoot, logs and RewriteEngine.

➰

SVG Divider Generator

Create SVG section dividers (waves, triangles, curves, zig-zag) with height/color.

🎞️

SVG Grain Generator

Create SVG grain effect using feTurbulence + feDisplacementMap.

🧾

Payment Receipt Generator

Generate a simple payment receipt (BR): payer, payee, amount in words, date and description. Print-ready text output.

📜

Simple Power of Attorney Generator

Generate a simple power-of-attorney text (BR-style) granting specific powers to a third party. Not legal advice.

🏠

Residence Declaration Generator

Generate a residence declaration (BR-style), common as proof of address for public agencies. Ready to print and sign.

✈️

Minor Travel Authorization Generator

Generate travel authorization for unaccompanied minor (BR domestic). For use with notary signature.

🎨

Stable Diffusion Prompt Builder

Build structured prompts for Stable Diffusion / Midjourney with subject, style, quality, lighting, camera. Negative prompt supported.

📋

Invoice Header Generator

Generate the HTML header of a professional invoice: logo, company name, tax data, number and date. Print/PDF-ready.

🔖

Text Watermark Generator

Apply a diagonal watermark over a long text (e.g., "CONFIDENTIAL") — HTML with print-ready CSS.

⏰

Vercel Cron Generator

Build a cron entry for vercel.json (scheduled jobs). Covers hourly, daily, weekly and custom presets.

↪️

.htaccess Redirect Generator

Generate Apache redirect rules for .htaccess with 301 (permanent) or 302 (temporary). Supports multiple rules.

↪️

Nginx Redirect Generator

Generate Nginx redirect rules (return 301/302) for location blocks. Accepts list of "from to" pairs.

🔁

.htaccess RewriteRule Generator

Generate RewriteRule (mod_rewrite) rules for .htaccess. Includes [L,R=301,QSA] flags and regex capture groups.

📝

HTML Form Generator from JSON

Read a JSON schema with fields (label, name, type, required) and generate a complete HTML form with styled inputs and validation attrs.

🏦

IBAN Bank Account Generator (fake, PT)

Generate fake IBAN account numbers in PT format. Test data only — not real accounts.

🆔

Brazilian RG Generator (with issuer)

Generate fake Brazilian RG numbers (XX.XXX.XXX-X) with issuer (SSP-SP, etc.) and fake date.

🏢

Random CNAE Generator

Pick a random CNAE (Brazilian Activity Classification) from 60 common activities. For mockups and registration tests.

🏭

Fake Company with CNAE

Generate fake company data: legal name, brand, valid CNPJ, primary CNAE and address. For test seeds.

🇧🇷

DARF Code Generator (Brazilian Federal Revenue)

Pick a DARF revenue code from the official list (0190 IRPF, 0561 IRRF, etc.). For mockups and fiscal-system tests.

📡

Anatel Homologation Code Generator (BR)

Generate a fake Anatel homologation code (XXXXX-YY-AAAAA). For mockups testing electronic products in Brazil.

⚡

ANEEL UC Code Generator (electric utility)

Generate fake Brazilian electric utility UC code (10 digits). For tests.

💊

Anvisa Registry Code Generator

Generate fake Anvisa drug/cosmetic registry code (1.NNNN.NNNN.NNN-N). For pharma mockups.

⚖️

Court Decision Number Generator (BR)

Generate fake Brazilian court decision number (Tribunal/Year/Sequence). For prototyping legal systems.

⚖️

CNJ Lawsuit Number Generator

Generate fake CNJ-format lawsuit number (NNNNNNN-DD.AAAA.J.TR.OOOO) with valid official check digits.

🎮

Twitch User ID Generator (fake)

Generate fake Twitch user IDs (numeric, 9-10 digits). For testing apps that consume the API.

❄️

Discord Snowflake ID Generator

Generate Discord-style Snowflake IDs (Twitter-like, 64-bit, timestamp-embedded). For bot mockups and library tests.

🎵

TikTok User ID Generator (fake)

Generate fake TikTok user IDs (19-digit Snowflake-like). For scraper and analytics tests.

🔓

CORS Headers Builder

Build a full set of CORS headers for an API: Access-Control-Allow-Origin, Methods, Headers, Credentials and Max-Age.

☁️

AWS S3 IAM Policy Generator

Generate an IAM JSON policy for AWS S3: read-only, write, full access or per-bucket custom. IAM-paste-ready.

📇

PIS Number with Date Generator

Generate fake Brazilian PIS/PASEP numbers paired with fake registration dates. For test seed data.

🚗

CNH (BR Driver License) Card Generator (fake)

Generate fake Brazilian driver license card data — number, category, issue/expiry date, issuer. For mockups.

📋

RG with History Generator

Generate a fake RG with 3 issuances (different dates/issuers) — simulates renewal history. For systems with audit trail.

🧾

ISS Service Code Generator

Generate fake ISS (Brazilian municipal service tax) codes from LC 116/2003 list. For service invoice tests.

📋

Decision Tracking Code Generator

Generate fake decision-tracking codes (ISTMT-YYYY-NNNN) for mocking governance and approval flows.

🌾

NIRF Rural Property Code Generator

Generate fake NIRF (Brazilian Federal Rural Property) codes — 8 digits. For rural property and ITR tax systems.

🏘️

CRECI (Real Estate Broker) Code Generator

Generate fake Brazilian CRECI broker codes (State-Number, e.g., SP-12345). For real estate mockups.

💸

Multi-type Pix Key Generator

Generate random Pix keys of 4 types: CPF, email, cellphone or EVP (UUID v4). For diverse test data.

📊

DAS-MEI Barcode Generator

Generate fake DAS-MEI tax slip barcode (Brazilian MEI), Febraban 47-digit format.

🚌

Bus Ticket Generator (fake)

Generate fake bus ticket: ticket #, origin, destination, date, time, seat, company. For travel mockups.

✈️

Flight Ticket Generator (fake)

Generate fake flight ticket: PNR, flight number, IATA origin/destination, date, class, seat. For mockups.

🎓

School Enrollment ID Generator

Generate fake school enrollment ID (YYYY+8 digits-D). For school system mockups.

📜

PA/DPA Administrative Process Generator

Generate fake Brazilian administrative/disciplinary process codes (AGENCY/YEAR/NUMBER). For government mockups.

⚖️

MP (Public Prosecution) Code Generator

Generate fake Brazilian Public Prosecutor procedure codes: PIC, NF (Notice of Fact), investigation procedure.

☁️

AWS IAM Trust Policy Generator

Generate AWS IAM Trust Policy JSON for Lambda, EC2, ECS, and other services. Defines who can assume the role.

🏪

MEI Full Profile Generator (BR)

Generate fake complete MEI profile: business name, valid CNPJ, CCMEI, CNAE activity and address. For test seeds.

🆔

CNPJ MEI Generator (root /0001)

Generate fake CNPJs always with /0001-XX terminus (root, MEI standard). DV by official algorithm.

📋

CEST Code Generator (BR Tax Substitution)

Generate CEST codes (Brazilian Tax Substitution Specifier) in XX.XXX.XX format. Picks from 28 official segments.

🏷️

NCM Code Generator (Mercosur)

Pick NCM codes (Mercosur Common Nomenclature, 8 digits) with generic description. For fiscal invoice mockups.

📑

Quote Number Generator

Generate fake quote numbers (ORC-YYYY-NNNNN: year + sequence). Configurable: custom prefix and count.

🛒

Order Code Generator

Generate short alphanumeric order codes (ORD-XXXX-9999) or long with timestamp (ORD-1700000000-XXXX). For e-commerce.

🧾

NF-e Sequential Number Generator

Generate the NF-e sequential number (9 digits) followed by series (3 digits). Not the 44-digit access key.

🚛

CT-e Sequential Number Generator

Generate fake CT-e (Brazilian e-Bill of Lading) sequential number (9 digits + series). For logistics mockups.

📦

MDF-e Number Generator

Generate fake MDF-e numbers (Brazilian Electronic Manifest) used to link CT-e and NF-e in a trip.

🏗️

BDI (Construction) Generator

Generate BDI (Indirect Costs) for construction quotes: profit, ISS, PIS, COFINS, contingencies. TCU standard.

🇧🇷

IBGE UF Codes List

List the 27 IBGE Brazilian state codes (11-53) with abbreviation and name. For UF dropdown population.

🏙️

IBGE Municipality Code Generator

Generate fake IBGE municipality code (7 digits: UF + 5 + DV). For mockups and state validation tests.

🏢

Condominium Profile Generator

Generate fake condominium profile: name, CNPJ, city registration, monthly fee and unit count. For real estate mockups.

🏬

Apartment Number Generator (with block)

Generate apartment identifiers (block + floor + unit) — Block A, Apt 304, etc. For real estate seeds.

🚗

Parking Spot Code Generator

Generate parking spot identifiers: sector (A-F), level (basement, ground) and number. For garage/mall mockups.

📶

Wi-Fi SSID Generator

Generate creative Wi-Fi SSIDs: theme (family, office, aggressive, fantasy) + optional numeric suffix.

🔐

Secure Random String Generator

Generate random strings with specific classes: lowercase, uppercase, digits, symbols. For passwords, tokens, codes. Uses crypto.getRandomValues.

👤

Creative Username Generator

Generate creative usernames combining adjective + animal/object + number (e.g., ninja_dragon_42). For sign-ups and profiles.

🌐

Special MAC Address Generator

Generate special MAC addresses: broadcast, multicast, random unicast, or with custom OUI (Apple, Intel, Samsung).

💊

Medical Prescription Generator (mockup)

Generate fake medical prescription with patient, doctor, CRM, medications. MOCKUP ONLY.

📋

Medical Certificate Generator (mockup)

Generate fake medical leave certificate. Includes patient, symbolic ICD-10, doctor, days. MOCKUP ONLY.

🧾

Invoice Mockup Text Generator

Generate plain-text invoice mockup: issuer, recipient, line items, total. NOT FISCALLY VALID — testing only.

🎬

Cinema Ticket Generator (mockup)

Generate fake cinema ticket: movie, room, session, seat, ticket type (3D, IMAX). For mockups.

🏦

Bank Receipt Mockup Generator

Generate fake bank transfer/Pix/TED receipt text. For UI testing — NEVER use in real transactions.

🚂

Train Ticket Mockup

Generate fake train ticket: origin/destination, class, coach, seat, time. For mockups (Eurail/SNCF style).

🚓

Traffic Fine Mockup Generator

Generate fake traffic fine: plate, violation, location, value, points. For mockups and CTB study. Not real.

✈️

Airline E-ticket Code Generator

Generate airline e-ticket code (13 digits: XXX-NNNNNNNNNN, IATA format). For check-in mockups.

🛵

Ride/Food App Order Code Generator

Generate short alphanumeric order codes for apps (Uber, iFood, 99) — 8 uppercase chars. For mockups.

📦

International Tracking Code Mockup

Generate international tracking codes in common formats: AliExpress (LP/RW/RU), 4PX, Yanwen. For e-commerce mockups.

🛒

Shopify ID Generator (cart/product)

Generate Shopify-format numeric IDs (12-15 digits) for carts, products and orders. For e-commerce mockups.

📋

Bulk CPF Generator

Generate many valid Brazilian CPFs at once (1 per line). For populating test databases.

🏢

Bulk CNPJ Generator

Generate many valid Brazilian CNPJs at once (1 per line).

🔢

MD4 Hash Generator

Compute the MD4 hash of a string. MD4 is legacy (1990), used by NTLM. Do not use for passwords.

🔢

BLAKE3 Hash Generator

Educational BLAKE3 placeholder (sha-256 variant). For production use @noble/hashes.

🔢

Whirlpool Hash Generator

Educational Whirlpool placeholder via SHA-512.

🔢

RIPEMD-160 Hash Generator

Educational RIPEMD-160 placeholder via SHA-1.

🐅

Tiger Hash Generator

Educational Tiger placeholder via SHA-256.

🔑

JWT HS256 Secret Generator

Generate a strong 256-bit secret for JWT HMAC-SHA256 signing, in Base64 or Hex.

🎲

Random Base91 String

Generate a random Base91-encoded string (more compact than Base64).

❄️

Discord Snowflake Generator

Generate a Discord-style Snowflake ID (with embedded timestamp) for testing.

🐦

Twitter Snowflake Generator

Generate a Twitter-style Snowflake ID (epoch=2010-11-04) for testing.

🐳

docker run Command Builder

Build a docker run command with image, name, ports, volumes, env vars and daemon flag.

💾

mysqldump Command Builder

Build a mysqldump command with host, user, db and common flags.

🐘

pg_dump Command Builder

Build a pg_dump command with host, user, db, format and output file.

📡

tcpdump Command Builder

Build a tcpdump command with interface, BPF filter, output file and verbosity.

🛡️

iptables Rule Builder

Build an iptables rule for INPUT/OUTPUT/FORWARD with protocol, port, action.

🔍

nmap Command Builder

Build an nmap scan command with target, port range, scan type and service detection.

📜

MIT License Generator

Generate the MIT license text filled with your name and year.

📜

Apache 2.0 License Generator

Generate the Apache 2.0 license header with copyright.

📜

GPL-3.0 License Generator

Generate the GNU GPL v3.0 header with name and year.

📜

BSD 2-Clause License Generator

Generate BSD 2-Clause license text with name and year.

📜

BSD 3-Clause License Generator

Generate BSD 3-Clause license text.

📜

MPL 2.0 License Generator

Generate MPL 2.0 header — weak copyleft compatible with proprietary.

📜

ISC License Generator

Generate ISC license text — simplified BSD 2-Clause equivalent.

📜

Unlicense Generator

Generate the Unlicense (public domain) text.

📜

WTFPL Generator

Generate the WTFPL text.

🛒

E-commerce Order ID Generator

Generate order codes in typical e-commerce format (PREFIX-YYYYMMDD-XXXX).

🎫

Support Ticket ID Generator

Generate support ticket numbers (AAAA.NNNNN.XX).

🏷️

meta author Tag

Build <meta name="author"> from author name.

🤖

meta robots Tag

Build <meta name="robots"> with directives.

🔗

link prefetch Tag

Build <link rel="prefetch"> for early resource fetching.

🔗

link preload Tag

Build <link rel="preload"> with as= directive.

🎨

color-scheme Meta

Build <meta name="color-scheme"> for light/dark hints.

🎨

theme-color Meta

Build <meta name="theme-color"> for browser bar color (mobile).

🎶

Escala Pentatônica

Gera escala pentatônica maior ou menor a partir da tônica.

🎸

Progressão de Acordes (I-IV-V)

Gera progressões clássicas em uma tonalidade (I-IV-V, I-V-vi-IV, ii-V-I).

🎸

Afinação Drop D (Guitarra)

Mostra a afinação Drop D padrão para guitarra (DADGBE) com frequências.

🌈

Paleta Monocromática

Gera 5 tons monocromáticos a partir de uma cor base, variando luminosidade.

🔄

Paleta Complementar

Gera cor complementar (180° na roda HSL) a partir de uma cor base.

🔺

Paleta Triádica

Gera 3 cores espaçadas 120° na roda HSL a partir de uma cor base.

🎨

Paleta Análoga

Gera 3 cores próximas (±30° em HSL) a partir de uma cor base.

🔷

Paleta Tetrádica

Gera 4 cores espaçadas 90° na roda HSL.

🌑

Tons (Shades) de uma Cor

Gera 5 tons mais escuros da cor base, mesclando com preto.

☀️

Tints (Mais Claros) de uma Cor

Gera 5 versões mais claras da cor base, mesclando com branco.

🌐

Cor Web-Safe Mais Próxima

Encontra a cor web-safe (216 cores, múltiplos de 51) mais próxima da informada.

👁️

Simulador Daltonismo (Protanopia)

Simula como uma cor é percebida por daltônicos do tipo protanopia (matriz aprox).

🐈

Gerador Nome de Gato

Sugere nomes criativos para gatos.

🐕

Gerador Nome de Cachorro

Sugere nomes para cachorros.

🦜

Gerador Nome de Pássaro

Sugere nomes para pássaros (canários, calopsitas, papagaios).

🇯🇵

Nome Bebê Japonês

Sugere nomes japoneses unisex.

🇮🇹

Nome Bebê Italiano

Sugere nomes italianos.

🇫🇷

Nome Bebê Francês

Sugere nomes franceses.

🇩🇪

Nome Bebê Alemão

Sugere nomes alemães.

🇪🇸

Nome Bebê Espanhol

Sugere nomes espanhóis.

🌙

Nome Bebê Árabe

Sugere nomes árabes.

🇷🇺

Nome Bebê Russo

Sugere nomes russos.

🇬🇷

Nome Bebê Grego

Sugere nomes gregos.

🧝

Nome de Elfo (RPG)

Sugere nomes para elfos em RPG/fantasia.

👹

Nome de Orc (RPG)

Sugere nomes para orcs/orquídeas em RPG.

🧙

Nome de Mago (RPG)

Sugere nomes para magos.

⚔️

Nome de Cavaleiro

Sugere nomes para cavaleiros medievais.

🪓

Nome de Anão (RPG)

Sugere nomes para anões em RPG.

🗡️

Nome de Bárbaro

Sugere nomes para personagens bárbaros.

🌿

Nome de Druida

Sugere nomes para druidas em RPG.

🚀

Nome de Startup Tech

Gera ideias para nomes de startups.

🏪

Nome de Loja

Sugere nomes para lojas.

🍽️

Nome de Restaurante

Sugere nomes para restaurantes.

☕

Nome de Cafeteria

Sugere nomes para cafeterias.

💈

Nome de Barbearia

Sugere nomes para barbearias.

🐾

Nome de Petshop

Sugere nomes para petshops.

🎙️

Nome de Podcast

Sugere nomes para podcasts.

📝

Nome de Blog

Sugere nomes para blog.

👗

Nome de Marca Moda

Sugere nomes para marcas de moda/roupa.

🎸

Nome de Banda Rock

Sugere nomes para bandas rock.

🤘

Nome de Banda Metal

Sugere nomes para bandas metal.

🌟

Nome de Banda Pop

Sugere nomes para bandas pop.

📣

Slogan Curto

Combina template + palavra-chave para um slogan curto.

💻

Nome de Produto SaaS

Gera ideias para nomes de produtos SaaS.

✨

Tagline de Marketing

Gera taglines genéricas.

🌐

Nome de Domínio Curto

Sugere nomes curtos para domínio.

💡

Conselho Aleatório

Mostra um conselho aleatório motivacional.

🌟

Frase Motivacional

Mostra uma frase motivacional aleatória.

🎨

Prompt MidJourney

Constrói prompt MidJourney com parâmetros de estilo, aspect ratio e versão.

🖼️

Prompt Stable Diffusion

Constrói prompt SD com positive, negative, sampler e CFG.

🤖

Prompt DALL-E

Constrói prompt para DALL-E com estilo e tamanho.

💬

Prompt ChatGPT (R-T-C-F)

Constrói prompt no formato Role-Task-Context-Format.

🔍

Prompt Code Review

Prompt para revisão automatizada de código.

📧

Prompt E-mail Formal

Prompt para gerar e-mail formal a partir de um briefing.

💡

Prompt Brainstorm

Prompt para brainstorm criativo.

🌍

Prompt Traduzir + Tom

Prompt para tradução com adaptação de tom.

📝

Prompt Resumir em Bullets

Prompt para resumir texto em N bullets.

🚀

Prompt Elevator Pitch

Prompt para criar elevator pitch.

📧

Botão E-mail Bulletproof

Gera HTML de botão para e-mail compatível com Outlook.

✍️

Assinatura de E-mail

Gera HTML de assinatura para e-mail corporativo.

🪪

Cartão de Visita HTML

Gera card visual para web/print de cartão de visita.

🎓

Certificado HTML

Gera certificado de conclusão em HTML imprimível.

⏳

Página Coming Soon

Gera template HTML "em breve" simples.

❌

Página 404 HTML

Gera template HTML para página 404.

🔧

Página Manutenção HTML

Gera template HTML para página em manutenção.

🍪

Banner de Cookies HTML

Gera banner de cookies com botão aceitar.

🔔

Notificação Toast HTML

Gera elemento toast/notificação para UI web.

🪟

Modal HTML

Gera estrutura HTML básica de modal/dialog.

💬

Tooltip HTML/CSS

Gera tooltip CSS-only com data-attribute.

📄

Fatura/Invoice HTML

Gera template de fatura simples.

📋

CV/Resume HTML

Gera template de currículo HTML imprimível.

📨

Formulário Contato HTML

Gera HTML de form contato básico.

📊

Progress Bar HTML

Gera barra de progresso HTML com %.

✂️

CSS Clip-Path Polígono

Gera CSS clip-path polygon() com pontos definidos.

⭐

CSS Clip-Path Estrela

Gera clip-path de estrela com N pontas.

📐

CSS cubic-bezier()

Gera função cubic-bezier(x1,y1,x2,y2).

📦

CSS Box-Shadow Multi

Gera box-shadow com múltiplas camadas.

✨

CSS Text-Shadow Stack

Gera text-shadow neon empilhado.

🌫️

CSS @keyframes fade

Gera animação fadeIn/fadeOut configurável.

💡

CSS Glow Neon

Gera efeito glow neon em borda/sombra.

📐

aspect-ratio → padding-bottom

Converte aspect-ratio em padding-bottom % (fallback CSS antigo).

📏

CSS clamp() Tipográfico

Gera clamp(min, vw, max) para fonte fluida.

📦

CSS Container Query

Gera @container query com tamanho mínimo.

📜

CSS Scroll Snap

Gera scroll-snap-type horizontal/vertical.

♿

CSS Focus Ring Acessível

Gera focus ring acessível seguindo WCAG.

🎨

CSS Cor de Seleção

Gera ::selection com cor customizada.

📏

CSS Scrollbar Customizada

Gera CSS de scrollbar customizada (WebKit + Firefox).

🎭

CSS Mask Image Gradiente

Gera mask-image com gradiente linear (fade na borda).

🫧

SVG Blob

Gera um blob orgânico SVG com curvas suaves.

🌊

SVG Onda

Gera onda SVG decorativa.

⭐

SVG Estrela N Pontas

Gera SVG de estrela com N pontas.

🔄

SVG Spinner Loading

Gera spinner de loading SVG animado.

📈

SVG Sparkline

Gera mini gráfico (sparkline) a partir de valores.

🍩

SVG Progress Ring

Gera ring de progresso SVG (0-100).

❤️

SVG Coração

Gera ícone SVG de coração colorido.

👤

SVG Avatar Iniciais

Gera avatar SVG com iniciais do nome.

🔮

SVG Favicon Emoji

Gera favicon.svg com um emoji.

🍩

SVG Donut Chart

Gera donut chart SVG de 2 fatias.

💪

Hashtags Fitness IG

Hashtags populares para fitness/treino.

🍔

Hashtags Comida IG

Hashtags para fotos de comida.

✈️

Hashtags Viagem IG

Hashtags para fotos de viagem.

👗

Hashtags Moda IG

Hashtags para fotos de moda.

💻

Hashtags Tech IG

Hashtags sobre tecnologia.

💄

Hashtags Beleza IG

Hashtags para beleza/maquiagem.

🎵

Hashtags TikTok Trends

Hashtags virais TikTok.

💼

Hashtags LinkedIn

Hashtags profissionais LinkedIn.

🐾

Hashtags Pets IG

Hashtags para fotos de pets.

🎨

Hashtags Arte Digital

Hashtags para arte digital/ilustração.

👼

Nome de Anjo da Guarda

Sorteia nome de anjo (Cabala/tradição cristã).

🏛️

Deusa da Mitologia

Sorteia nome de deusa de várias mitologias.

🆔

Username Aleatório

Gera username de 8 caracteres com tema (gamer/dev/poetic).

🎼

Círculo de Quintas

Exibe a sequência completa do círculo de quintas (maior) a partir de Dó.

🎺

Gerador de Modo Grego

Gera as notas do modo grego escolhido a partir de uma tônica (Iônio, Dórico, Frígio, Lídio, Mixolídio, Eólio, Lócrio).

🎻

Análise por Cifra Romana

Mostra acordes diatônicos (I-ii-iii-IV-V-vi-vii°) na tonalidade maior escolhida.

🎸

Extensões Jazz (7/9/11/13)

Gera notas de um acorde com tensões: 7M, 9, 11 ou 13 a partir da fundamental.

🪕

Nomes dos Graus da Escala

Lista os 7 graus de uma escala maior com nomes (Tônica, Supertônica, Mediante, Subdominante, Dominante, Superdominante, Sensível).

🎯

OKR Builder (1 Objetivo + 3 KR)

Monta OKR formatado: 1 objetivo qualitativo + 3 key results quantitativos.

🗓️

Gerador de Time Blocking

Cria blocos de tempo a partir de hora inicial, duração de cada bloco e quantos blocos. Ex: 09:00, 50 min, 6 blocos.

📋

Kanban 3 Colunas Gerador

Distribui tarefas em 3 colunas: To Do | Doing | Done. Use prefixo > para Doing, ✓ para Done.

📅

Template de Revisão Semanal

Gera template de weekly review GTD: vitórias, desafios, aprendizados, próximos passos.

📓

Template de Diário Reflexivo

Gera template diário: gratidão (3), foco do dia, energia (1-10), reflexão noturna.

🛡️

OAuth State CSRF Token

Gera valor "state" criptograficamente aleatório (32 bytes base64url) para mitigar CSRF.

🔐

OAuth PKCE Verifier + Challenge

Gera code_verifier (43-128 chars) e code_challenge S256 (usa SubtleCrypto se disponível).

📋

Template PRD (Product Requirements)

Gera template de PRD com seções padrão (problema, usuários, métricas, escopo).

🧩

Template Design Doc

Gera template de Design Doc de engenharia (contexto, design, alternativas, plano).

📕

Template Runbook

Gera template de runbook operacional (alertas, diagnóstico, mitigação).

🩺

Template Postmortem

Gera template de postmortem blameless (resumo, timeline, root cause, ações).

📨

Template RFC

Gera template de RFC (Request for Comments) para discussão técnica.

🏛️

Template ADR (Architectural Decision)

Gera template de ADR no padrão Michael Nygard.

📄

Template 1-Pager

Gera template de 1-Pager executivo (problema, solução, métricas, ask).

📑

Template SOW (Statement of Work)

Gera template de SOW contratual (escopo, entregáveis, prazos, pagamento).

📖

Template README

Gera README.md completo com badges, instalação, uso, testes, contribuição.

🤝

Template CONTRIBUTING

Gera CONTRIBUTING.md (issues, PRs, código de conduta, estilo).

🔐

TOTP Secret Generator

Generate a random Base32 secret (160 bits) for TOTP/HOTP (Google Authenticator, Authy, 1Password). Also creates a ready otpauth:// URL.

🛡️

OAuth State Generator

Generate secure random state tokens (128 bits) for CSRF protection in OAuth 2.0 flows. Recommended by RFC 6749.

🎲

DnD Dice Roller

Roll dice in DnD notation (e.g. 1d20+3, 4d6, 2d10-1). Supports multiple dice, +/- modifiers and shows each result.

🎯

Boggle Board Generator

Generate a 4×4 Boggle board with random letters following the classic dice frequencies. Useful for creating word puzzle games.

🔢

Magic Square Generator

Generate odd-order magic squares (3x3 up to 11x11) using De la Loubère's method. Rows, columns and diagonals all sum to the same value.

🧩

Easy Sudoku Generator

Generate a valid 9x9 Sudoku board on easy mode (around 40 clues). Includes the full solution for reference.

🏴‍☠️

Pirate Ipsum Generator

Generate fake text in pirate speak ("Arrr! Avast ye! Ahoy matey…"). A fun alternative to traditional Lorem Ipsum for mockups.

🕵️

Codename Generator

Generate random codenames in secret-agent style: adjective + noun + number (e.g. Silent Falcon 07, Blue Storm 42).

🏆

Fantasy Team Name Generator

Generate fictional sports team names in fantasy style: imaginary city + mythical animal. Useful for game projects, mockups and RPGs.

⚔️

RPG Fantasy Character Generator

Create complete fantasy RPG characters: random name, race, class, alignment, background trait and main attribute. A great starting point for campaigns.

🗃️

Mock SQL Data Table Generator

Generates a CREATE TABLE + 5 mock INSERTs based on the table name you provide.

🔮

Mock GraphQL Schema Generator

Generates a basic GraphQL schema (type, Query, Mutation) from the resource name.

🧬

TypeORM Entity Generator from Table

Generates a TypeORM (TypeScript) class with @Entity, @PrimaryGeneratedColumn and basic columns from a table name.

🦊

Sequelize Model Generator from Table

Generates a Sequelize (JS) model with sequelize.define, columns and timestamps from a table name.

🍃

Mongoose Model Generator from Collection

Generates a Mongoose (JS) Schema + model with basic fields and timestamps from a collection name.

▲

Prisma Model Generator from Table

Generates a Prisma model block (schema.prisma) with id, name, email and timestamps from a table name.

🧶

Knex Migration Generator from Table

Generates a Knex (JS) migration with createTable and dropTable from a table name.

🐦

Flyway Migration Generator from Table

Generates a Flyway file (V1__create_table.sql) with CREATE TABLE from a table name.

🌊

Liquibase Changelog Generator from Table

Generates a Liquibase changelog (YAML) with a createTable changeSet from a table name.

🟦

TypeScript Interface Generator from Table

Generates a TypeScript interface from a table name — id number, name/email string, createdAt Date.

🎹

Piano Chord Generator

Generates the notes of a major, minor, diminished or augmented chord from the given root note.

🎶

Musical Scale Generator

Generates the 7 notes of major, natural minor, harmonic minor and blues scales from a tonic.

🎸

Pop Chord Progression Generator

Generates progressions I-V-vi-IV, ii-V-I and others from a major key, showing each degree as a chord.

☘️

Celtic Baby Name Generator

Generates Celtic (Irish, Scottish, Welsh) baby names with meaning — pick masculine or feminine.

🦓

African Baby Name Generator

Generates African baby names (Swahili, Yoruba, Akan) with meaning — bank with 200+ names by gender.

🤖

Dystopian Character Name Generator

Generates cyberpunk/dystopian character names with corporate surnames, numbers and tactical designations.

⚔️

Medieval Knight Name Generator

Generates medieval names with noble titles (Sir, Lady, Lord of…) for RPG or fiction writing.

🍣

Sushi Dish Name Generator

Creates fictional sushi dish names (Hosomaki with truffled salmon) — useful for menus and roleplay.

🍸

Cocktail Name Generator

Generates creative names for signature cocktails using bartender patterns (adjective + noun + place).

🍺

Craft Beer Name Generator

Generates craft beer names following real patterns (animal + feeling, place + style).

🥗

Poke Restaurant Name Generator

Generates names for poke houses and restaurants using current gastronomy marketing patterns.

🏘️

Condo / Real Estate Name Generator

Creates names for real estate developments (Residencial Parque das Acácias) using market patterns.

🚀

B2B SaaS Startup Name Generator

Generates short B2B startup names (.ai/.io, prefixes like 'Up', 'Sync') and suggests TLDs.

🧑

Fake Social Profile Generator

Generates fictional profile (name, DiceBear avatar, bio, handle) for social network mockups — not for production.

💬

Fake Blog Comments Generator

Generates N varied fictional comments (positive, negative, neutral, question) for comment section mockups.

💭

Fake Chat Conversation Generator

Generates fictional chat dialogue between two personas (support, sales, couple) — outputs JSON or text.

📄

Fake Resume CV Generator

Generates fictional resume (name, experience, education, skills) — for prototypes of job portals.

🏢

Fake Company Address Generator

Generates fictional company with full Brazilian address (street, number, district, ZIP, city, state) for mocks.

🧾

Fake Invoice Generator

Generates fictional invoice in printable text — multiple items, totals and taxes computed.

📦

Fake E-commerce Order Generator

Generates fictional e-commerce order with products, prices, shipping, total, status — useful for UI tests.

📊

Fake Leads CSV Generator

Generates CSV with N fictional leads (name, email, phone, company, role) for CRM and import tests.

📅

Fake iCal Events Generator

Generates N fictional events in .ics format (appointments, deadlines) for Google/Outlook integration tests.

📃

Fake Paginated JSON Generator

Generates JSON with fake pagination structure (page, pageSize, total, items) to mock a REST API.

🖼️

Image Color Palette Extractor (local)

Extracts a dominant palette from a local image (simple k-means) — processing runs 100% in the browser.

🎯

Random AA Contrast Color Generator

Generates two random colors that satisfy WCAG AA (4.5:1) contrast for text on background.

🖍️

Approximate CMYK Paint Color

Approximates a digital RGB color as a physical paint mix (CMYK + white) — useful for traditional artists.

💄

Palette as CSS Variables

Takes a hex palette and exports it as a CSS variables block (:root { --primary-50: ... }) ready to use.

🃏

Random Tarot Card Generator

Draws a card from the Major or Minor Arcana with description and upright/reversed meanings — no real divination, just a dataset.

💳

Stripe Test Cards Generator

Interactive list of official Stripe test cards by scenario (success, decline, 3DS, fraud, expired) for sandbox use.

🪪

Fake Brazilian RG by State

Generates RG numbers following the visual format of each Brazilian state (SP, MG, RJ, RS…) for testing — fictional, no legal validity.

📱

Fake Brazilian Mobile Number

Creates valid Brazilian mobile numbers in (DDD) 9XXXX-XXXX format with your choice of real area code to seed test databases.

📖

Random Bible Verse Generator

Draws a verse from a curated list with reference (book, chapter, verse) — great for daily social posts.

🌊

SVG Wave Divider Generator

Create SVG section dividers as waves, peaks or curves with customizable height, frequency, opacity and color. Download SVG or copy directly.

📊

Code 128 Barcode Generator

Generate Code 128 barcodes (A, B and C) for any text/number with PNG and SVG download — ideal for labels and logistics.

🔲

Data Matrix Generator

Create compact 2D Data Matrix (ECC 200) codes for industrial parts and traceability. Supports text and numbers with PNG/SVG download.

📑

PDF417 Barcode Generator

Create PDF417 barcodes (driver license / boarding pass style) for long text, with PNG and SVG download and error level control.

📊

Bulk UTM URL Generator (CSV)

Generate UTM URLs in bulk from a matrix of sources, mediums and campaigns. Exports a CSV list ready for tracking in a spreadsheet.

🌫️

Noise SVG Texture Generator

Create noise (grain) textures in SVG using feTurbulence for modern backgrounds. Control frequency, octaves and output color.

🎲

Random Fake JWT Generator

Generate a JWT with random header/payload/signature (no valid signature) for mocking OAuth flows in local development.

🇳🇱

Fake Dutch BSN Generator

Generate a valid Burgerservicenummer (BSN) Dutch citizen number (9 digits with 11-test) — for form testing only.

🇮🇹

Fake Italian Codice Fiscale Generator

Generate an Italian Codice Fiscale with valid checksum from name/date — for signup form testing only.

🌸

Portuguese Haiku Generator

Create a 5-7-5 syllable haiku in Portuguese by drawing themed words (nature, seasons) — useful for creative inspiration.

📮

Random Brazilian Address Generator

Generate a fake address with street, number, neighborhood, city, state and ZIP — complete for forms and fixtures.

🔢

Screen Lock PIN Generator

Generate a numeric PIN avoiding weak sequences (1234, 0000, common dates, repeats) with security level options.

🌫️

BlurHash Generator

Generate a compact BlurHash string from an image to use as a blurred placeholder in apps and sites while the image loads.

🖼️

ThumbHash Generator

Create ThumbHashes (modern alternative to BlurHash) ~25 bytes that render colored thumbnails as placeholders before the real image.

🔑

SSH Keypair Generator (Ed25519)

Generate Ed25519 SSH keypairs client-side ready to use in ~/.ssh/, with SHA256 fingerprint and OpenSSH format.

🔐

PGP/GPG Keypair Generator

Create OpenPGP keys (RSA or Curve25519) with custom user ID and expiration, ready for ASCII armor and GnuPG import.

🎲

EFF Large Passphrase Generator

Generate memorable passwords using the official EFF Large list (7776 EN words), with per-word entropy and custom separator.

🌐

Complete Favicon Package Generator

From an image, generate a complete zip with ICO, favicon-16/32, apple-touch, Android Chrome 192/512 and site.webmanifest for PWA.

🔑

XKCD Passphrase Generator (PT-BR)

Generate memorable xkcd-style passphrases (4-6 separated words) using a Brazilian Portuguese dictionary with computed entropy.

🏦

Fake BIC/SWIFT Generator

Generate structurally valid BIC/SWIFT codes (8 or 11 chars) for international payment testing. They do not match real banks.

🌍

Multi-country IBAN Generator

Generate structurally valid IBANs (MOD-97) for 40+ countries (DE, FR, ES, IT, PT, NL, BE, GB) for QA of payment gateways.

🪟

browserconfig.xml Generator

Create `browserconfig.xml` with tiles for Windows/IE11 from PNGs of 70×70 to 310×310. Includes background color and logo.

📡

RSS 2.0 → Atom 1.0 Converter

Convert a pasted RSS 2.0 feed into an equivalent Atom 1.0 feed, preserving title, author, links and dates. Ready to publish.

📰

JSON Feed v1.1 Generator

Generate JSON Feed v1.1 (jsonfeed.org) feeds from items (title, URL, content, date). Output ready for `application/feed+json`.

📧

BIMI Record Generator

Create DNS BIMI (Brand Indicators for Message Identification) records with the logo SVG URL and optional VMC for visual email authentication.

🔒

MTA-STS Policy Generator

Generate the MTA-STS policy file (RFC 8461) and matching TXT record to enforce TLS for email transport between servers.

📊

TLS-RPT Record Generator

Build DNS TLS-RPT records (RFC 8460) to receive SMTP TLS failure reports via email or HTTPS.

🪪

OpenID Discovery Generator

Generate the OpenID Connect Discovery JSON (RFC 8414) with endpoints, scopes, grants and supported algorithms for your OP.

🎨

Image Color Palette Generator

Upload an image and extract 3 to 24 dominant colors via k-means clustering. Export as HEX, RGB, CSS variables or Tailwind.

🖼️

Open Graph Image Generator

Create 1200×630 Open Graph images with title, description, author, logo and custom background. Export as ready-to-use PNG.

📐

Graph Paper SVG Generator

Generate squared, millimeter, ruled, isometric or dot-grid paper as printable SVG sized for A4/Letter.

🏁

Checker Pattern SVG Generator

Create a configurable checker (chessboard) SVG pattern with two colors and cell size, perfect for backgrounds and fallbacks.

🟣

Polka Dot SVG Generator

Generate a configurable polka-dot SVG pattern with color, radius and spacing — exports as a CSS background.

🔷

Isometric Grid SVG Generator

Generate an isometric SVG grid with configurable 30 degree angle for game maps and isometric diagrams.

🎨

Split-Complementary Palette Generator

Generate a split-complementary color palette (base + 2 colors adjacent to the complement) with hex, RGB and HSL.

🎲

Yahtzee Score Card Generator

Generate a printable Yahtzee score card as PDF/PNG with up to 6 players and all categories.

🆔

TSID Generator (Time-Sorted ID)

Generate 64-bit time-sorted TSIDs ideal for distributed DB PKs, with timestamp decoder.

🎲

UUID v8 Custom Generator

Generate custom UUIDs v8 (RFC 9562) with arbitrary 122-bit payload useful for hierarchical or shard-aware IDs.

🔐

JWKS EC Generator (P-256/P-384/P-521)

Generate a JWKS (JSON Web Key Set) with EC key (P-256/P-384/P-521) ready for /.well-known/jwks.json endpoint, with kid and use.

🔁

RRULE iCal Generator (RFC 5545)

Generate RFC 5545 recurrence rules (RRULE) with FREQ, BYDAY, INTERVAL, COUNT/UNTIL preview of next 10 occurrences.

📖

Classic Quote of the Day (PT-BR)

Deterministic daily quote by date from PT-BR literary classics (Pessoa, Drummond, Machado, Cecilia, Bandeira).

📡

MQTT Topic Builder

Build MQTT topics with + and # wildcards, validate hierarchy, and suggest patterns (Sparkplug B, Homie 4).

🔐

Multi-Algorithm .htpasswd Generator

Creates .htpasswd files for Apache and Nginx with bcrypt, APR1, SHA-256, SHA-512 or crypt, with multiple users in a single export.

⭕

Emoji Favicon SVG Generator (Circle)

Creates SVG favicon with any emoji centered inside a customizable colored circle, exporting as SVG and PNG 32/64/128px.

🔑

SSH known_hosts Lines Generator

Builds valid lines for the ~/.ssh/known_hosts file from host, port, key type and fingerprint, with optional HMAC hashing.

📧

Full mailto: Link Generator (CC/BCC)

Builds complex mailto: links with multiple recipients, CC, BCC, subject and body properly encoded, ready for HTML or QR Code.

✅

Markdown Comparison Table Generator

Visual interface to build comparison tables in Markdown with checkmarks, icons and color cells via emoji, ideal for READMEs.

🔐

.env File Generator by Stack

Creates complete .env and .env.example files for common stacks (Next.js, Django, Rails, Laravel, Vite) with placeholders and documented comments.

⬡

SVG Honeycomb Pattern Generator

Generates a tileable SVG with a hexagon (honeycomb) pattern parameterized by size, gap and two colors.

🔀

SVG Zigzag Pattern Generator

Generates a tileable SVG with zigzag (chevron) lines parameterized by amplitude, frequency, color and thickness.

📐

SVG Diagonal Stripes Pattern Generator

Generates a tileable SVG with alternating diagonal stripes in two colors, controlling angle, width and gap.

🧱

SVG Brick Pattern Generator

Generates a tileable SVG simulating brick masonry with alternating offset, parameterizing dimensions and mortar.

♟️

CSS Checker Pattern Generator

Generates pure CSS code with repeating-conic-gradient or linear-gradient to render a checker pattern without images.

⏰

Cron Timezone Shifter

Converts a crontab expression from one timezone to another, shifting hour/minute and handling day-of-week wrap.

🌀

Spirograph SVG Generator

Generate hypotrochoid and epitrochoid (spirograph) figures in SVG adjusting outer radius, inner radius and offset, exporting for design and print.

📈

Lissajous SVG Generator

Create Lissajous figures in SVG adjusting X and Y frequencies, phase and damping, with PNG export for design and educational physics.

💵

Guilloche Pattern SVG Generator

Generate interlocking guilloche patterns in SVG used in banknotes, certificates and stamps, with control over radii, nodes and rotational symmetry.

🐝

Honeypot Form Field Generator

Generate HTML+CSS snippets for an anti-spam honeypot field (input invisible to bots, accessible to humans) with optional timestamp.

Ⓜ️

Monogram SVG Generator

Create initials monograms in SVG with serif and script fonts, interlocked or stacked layouts, and circular or heraldic frames.

🗣️

SSML Builder (Speech)

Build SSML (Speech Synthesis Markup) documents compatible with Alexa, Google and Polly with break, prosody, emphasis, phoneme and voice tags.

📇

vCard QR Code Generator

Generate QR Code containing vCard 3.0 with name, phone, email, company, URL, and address, scannable by phone camera.

📱

SMS QR Code Generator

Generate QR Code that, when scanned, opens the SMS app with pre-filled number and message (SMSTO: format).

📍

Geolocation QR Code Generator

Generate QR Code with coordinates (geo:lat,lng) or Google Maps link, opening map apps directly at the location.

💶

SEPA Transfer QR Code Generator

Generate EPC069-12 standard QR Code for SEPA transfers in Europe, with IBAN, beneficiary, amount, and description.

👷

Random CBO Generator (Brazil)

Generate valid codes from the Brazilian Classification of Occupations (CBO 2002) with 6 digits, occupation name, and major group.

📷

Instagram Snowflake Generator

Generate Snowflake IDs in the format used by Instagram (54 bits, epoch 2011-01-01), with timestamp, shard, and sequence.

🎨

Coordinated Pantone Palette Generator

From a Pantone color, generate a coordinated palette (complementary, analogous, triadic) with approximate Pantone matches.

📊

GitHub Readme Stats SVG Generator

Build a stats SVG (github-readme-stats style) with username, theme and metrics — filled in manually, no API needed.

🫧

Animated CSS SVG Blob Generator

Build an SVG blob with CSS-animated morphing (animation/keyframes), ready to paste into a landing page.

🍪

LGPD Cookie Banner (Categories) Generator

Generate HTML/JS for an LGPD-compliant cookie banner with 4 categories (essential, analytics, marketing, preferences) and granular toggles.

☕

Coffee Brew Ratio Recipe Generator

Generate step-by-step recipes (V60, Aeropress, French Press, Cold Brew) with coffee/water ratio, grams, bloom and pour times.

🍞

Bakers Percentage Bread Recipe Generator

Given total flour weight and hydration percentage, generate a full recipe (water, salt, yeast) in baker's percentage.

🅰️

Letter Favicon SVG Avatar Generator

Generates SVG favicon with 1-2 initial letters on circular or square colored background (optional gradient). Single-file SVG output.

🖼️

Letter Avatar PNG Generator

Creates round PNG avatar (256x256) with name initials in a color derived from hash. Useful for chat UIs and profiles without photos.

🎮

Pixel Art Palette Generator (Lospec Style)

Generates 4/8/16/32 color palettes optimized for pixel art with retro presets (Game Boy, NES, PICO-8, Sweetie-16). Export .hex and .gpl.

🔑

EFF Short Wordlist 1 Passphrase Generator

Generate passphrases using the EFF Short Wordlist (1296 easy-to-type words), different from EFF Large. Shows entropy per word.

🔐

EFF Short Wordlist 2 Passphrase Generator (Prefix)

Uses EFF Short Wordlist 2 (1296 words with unique 3-letter prefixes) for faster autocomplete in apps.

🎬

Fountain Screenplay Formatter

Takes a script in Fountain syntax (plain text with conventions) and renders a formatted HTML preview in screenplay style (Courier, centered headings).

🧙

Hobbit/Halfling Name Generator (RPG)

Generates Tolkien-style hobbit/halfling names (Bilbo, Frodo, Samwise) with thematic surname for D&D tables.

👹

Tiefling Name Generator (RPG)

Generates infernal names for D&D tiefling (virtue + demonic name) with approximate pronunciation.

🐉

Dragon Name Generator (RPG)

Generates epic ancient dragon names with guttural syllables (Vermithrax, Sardiokar) for fantasy campaigns.

😇

Aasimar Name Generator (RPG)

Generates celestial names for D&D aasimar combining angelic roots and divine suffixes for characters of light.

🎨

Munsell Color to Hex Sample Generator

Generates hex samples from Munsell notation (Hue Value/Chroma — e.g. 5R 4/14) used in soils, art and aesthetics.

♿

Deuteranopia Accessible Palette Generator

Generates a safe palette for deuteranopes (most common form of color blindness) ensuring CVD-pre-simulated distinguishability.

💿

Schema MusicAlbum JSON-LD

Build Schema.org MusicAlbum JSON-LD with name, artist (byArtist), release date, genre, label and tracklist (itemListElement of MusicRecording with ISO 8601 duration PT3M42S).

🔭

WebFinger JRD Builder (RFC 7033)

Build a JRD (JSON Resource Descriptor) for WebFinger (.well-known/webfinger) responses with acct: subject, aliases, properties and links (rel, type, href) — as used by Mastodon/ActivityPub.

🔑

.netrc File Builder

Build a ~/.netrc file (curl, ftp, git credential) with multiple 'machine HOST' entries (login, password, optional account) and a single 'default' fallback. Rejects passwords with '#' or whitespace (which break parsers) and reminds you to chmod 600.

🖧

Locally-Administered Unicast MAC Generator

Generate random MAC addresses with the U/L bit = 1 (locally administered) and I/G = 0 (unicast) — the first octet always lands at x2, x6, xA or xE, avoiding collisions with real OUIs. Formats: colon, hyphen, Cisco dot and bare.

🔀

Thue-Morse Sequence

Generate the first terms of the Thue-Morse sequence, the binary sequence whose n-th bit is the parity of the number of ones in the binary representation of n. It is cube-free and appears in chess, music and combinatorial game theory.

🔣

Kolakoski Sequence

Generate the first terms of the Kolakoski sequence, the self-describing sequence of 1s and 2s whose run lengths reproduce the sequence itself. One of the simplest examples of a self-referential mathematical object.

🌀

Recamán Sequence

Generate the first terms of the Recamán sequence: starting at 0, at each step n you subtract n if the result is positive and not yet visited, otherwise you add n. Famous for its visual pattern of arcs and the open question of whether it covers every integer.

📊

Farey Sequence

Generate the Farey sequence of order n: all irreducible fractions between 0 and 1 whose denominator does not exceed n, in increasing order. Neighboring fractions satisfy the mediant and unit-determinant property, the basis of Ford circles.

🧩

Integer Partitions p(n)

Compute p(n), the number of ways to write an integer as a sum of positive integers regardless of order, and list the partitions for small values. A central function in the theory of partitions studied by Euler and Ramanujan.

🔢

Stirling Numbers (Second Kind)

Generate row n of the Stirling numbers of the second kind S(n,k), which count the ways a set of n elements can be partitioned into k non-empty subsets. They appear in combinatorics, in converting between powers and falling factorials, and in partition theory.

📐

Eulerian Numbers

Generate row n of the triangle of Eulerian numbers A(n,k), which count how many permutations of n elements have exactly k ascents (positions where the next value is larger). Each row sums to n! and they link to Eulerian polynomials and permutation statistics.

🌀

Motzkin Numbers

Generate the first Motzkin numbers, which count the ways to draw non-crossing chords between points on a circle, among many other combinatorial interpretations. The sequence starts 1, 1, 2, 4, 9, 21, 51, 127 and is a cousin of the Catalan numbers.

🔢

Schröder Numbers

Generate the first large Schröder numbers, which count the lattice paths from (0,0) to (n,n) using right, up and diagonal steps without crossing the main diagonal. The sequence starts 1, 2, 6, 22, 90, 394, 1806 and appears in subdivision and parenthesization problems.

🔺

Narayana Numbers (Triangle)

Generate row n of the Narayana triangle N(n,k) = C(n,k)·C(n,k−1)/n, which refines the Catalan numbers: each row sums to a Catalan number. They count, for example, the Dyck paths of length 2n with exactly k peaks. A symmetric, elegant triangle.

🔢

Central Delannoy Numbers

Generate the first central Delannoy numbers, which count the paths from (0,0) to (n,n) on a grid using east, north and northeast (diagonal) steps. The sequence starts 1, 3, 13, 63, 321, 1683 and relates to the Schröder numbers and lattice geometry.

➗

Bernoulli Numbers

Generate the Bernoulli numbers B(0) to B(n) as exact fractions. These rationals appear in sums of integer powers, in the Taylor series of trigonometric functions and in the Riemann zeta function. They start 1, −1/2, 1/6, 0, −1/30, 0, 1/42 and the odd ones above 1 are zero.

🔢

Lah Numbers

Generate row n of the Lah numbers L(n,k) = C(n−1,k−1)·n!/k!, which count the ways a set of n elements can be partitioned into k non-empty ordered lists. They are the coefficients that convert rising factorials into falling ones and appear in combinatorics and umbral calculus.

🔺

Tetrahedral Numbers

Generate the tetrahedral numbers, which count how many spheres form a triangular-based pyramid: T(n) = n(n+1)(n+2)/6. The sequence starts 1, 4, 10, 20, 35, 56 and is the three-dimensional version of the triangular numbers (each term is the sum of triangulars up to n).

🔻

Square Pyramidal Numbers

Generate the square pyramidal numbers, which count the spheres stacked in a square-based pyramid: P(n) = n(n+1)(2n+1)/6 — also the sum of the first n perfect squares. The sequence starts 1, 5, 14, 30, 55, 91 and is famous for the cannonball problem.

⭐

Star Numbers

Generate the star numbers, which count the dots of a centered six-pointed star (hexagram): S(n) = 6n(n−1) + 1. The sequence starts 1, 13, 37, 73, 121, 181. They are centered figurate numbers related to the centered hexagonal numbers.

🔢

Pronic (Oblong) Numbers

Generate the pronic numbers (also called oblong or heteromecic), the product of two consecutive integers: P(n) = n(n+1). The sequence starts 0, 2, 6, 12, 20, 30, 42. They are twice the triangular numbers and the sum of the first n even numbers.

📐

Pythagorean Triples Generator

Generate the Pythagorean triples (a, b, c) with a² + b² = c² up to a maximum hypotenuse, marking which are primitive (sides with no common factor). Uses Euclid's formula with pairs of integers m > n. Useful in geometry, trigonometry and number theory.

🔢

Sphenic Numbers

Generate the sphenic numbers, the integers that are the product of exactly three distinct primes, such as 30 = 2·3·5 and 42 = 2·3·7. The sequence starts 30, 42, 66, 70, 78, 102, 105, 110. Every sphenic number has exactly eight divisors.

🌲

Binary Heap Builder

Build a binary heap (min or max) by inserting a sequence of numbers one by one with the sift-up operation. Shows the final heap array and its level-by-level structure. The heap is the basis of the priority queue and of heapsort.

🎲

Subsets Generator (Power Set)

Generate all subsets of a set — the power set —, which for n elements are 2ⁿ subsets, including the empty set and the set itself. Useful in combinatorics, brute force and case enumeration.

🎲

Combinations Generator (k of n)

List all combinations of k elements chosen from a set of n, without repetition and regardless of order — that is C(n,k) combinations. Unlike permutations, {1,2} and {2,1} count as the same. Useful in draws, testing and combinatorial analysis.

✅

CPF Validator

Validate Brazilian CPF numbers instantly using the official algorithm. Useful for testing document validation in applications. No data sent to servers.

📋

Batch CPF Validator

Validate a list of CPFs (one per line) and see which are valid and which are not. No data sent to servers.

📋

Batch CNPJ Validator

Validate a list of CNPJs (one per line) with a summary of valid, invalid and total. No data sent to servers.

🔑

Pix Key Validator

Validate Brazilian Pix keys of any type: CPF, CNPJ, email, phone (+55) or random UUID. Detects the type automatically.

📦

Tracking Code Validator

Validate the format of Brazilian Correios tracking codes (AA123456789BR). Identifies the service prefix and the country.

✅

Alphanumeric CNPJ Validator

Validate the new Brazilian alphanumeric CNPJ format (IN RFB 2.119/2022): 12 alphanumeric characters plus 2 mod-11 check digits.

📜

NFe Key Validator

Validate Brazilian electronic invoice access keys (44 digits) with mod-11, state code and model checks. Decomposes the fields for audit.

🏦

IBAN Validator

Validate any international IBAN following ISO 13616 (mod-97) with country and length checks. Runs entirely in your browser — no data is sent anywhere.

✅

CNPJ Validator

Validate Brazilian CNPJ numbers instantly using the official algorithm. Useful for testing fiscal document validation. No data sent to servers.

✅

PIS/PASEP Validator

Validate Brazilian PIS/PASEP numbers using the official check-digit algorithm. No data sent to servers. Free and no sign-up.

✅

RENAVAM Validator

Validate Brazilian RENAVAM vehicle registration numbers using the official DENATRAN algorithm. No data sent to servers.

✅

Brazilian Voter ID Validator

Validate Brazilian voter ID (Título de Eleitor) numbers using the official TSE algorithm. No data sent to servers.

✅

CNH Validator

Validate Brazilian driver's license (CNH) numbers using the official DETRAN algorithm. No data sent to servers.

✅

Credit Card Validator

Validate credit card numbers using the Luhn algorithm. Identifies the card brand and verifies the check digit, no data sent to servers.

✅

RG Validator

Validate Brazilian RG numbers in the SP format (9 digits + check digit). Browser-side verification, no data sent to servers.

✅

Brazilian Certificate Number Validator

Validate Brazilian birth, marriage or death certificate numbers in the 32-digit CNJ format. Browser-side verification.

✅

Brazilian State Tax ID Validator

Validate Brazilian State Tax IDs (Inscrição Estadual) for SP, RJ, MG, RS, PR and BA. Browser-side verification.

✅

Brazilian Bank Account Validator

Validate Brazilian bank account numbers by check digit for major banks (Bradesco, Itaú, Banco do Brasil, Santander and Caixa). Browser-side verification.

📧

Email Validator

Check if an email address is valid. Analyzes structure, domain and local part. Processed in the browser, no data sent to any server.

🔗

URL Validator

Check if a URL is valid and analyze its parts: protocol, domain, path, parameters and hash. Processed in the browser.

🆔

UUID Validator

Validate UUIDs (v1, v3, v4, v5, v7) and identify the version. Accepts with or without hyphens, upper or lower case. Everything in your browser.

🖧

MAC Address Validator

Validate MAC addresses in colon (xx:xx:xx:xx:xx:xx), hyphen, Cisco (xxxx.xxxx.xxxx) or no-separator formats. Identifies unicast/multicast and local/universal. Everything in your browser.

🌐

IP Validator (v4 and v6)

Validate IPv4 and IPv6 addresses with auto-detection. Shows class (A/B/C/D/E), private vs public, loopback, multicast and canonical format. Everything in your browser.

🎨

Hex Color Validator

Validate hex colors in #RGB, #RGBA, #RRGGBB or #RRGGBBAA format and convert between them. Everything in your browser.

🚗

Vehicle Plate Validator (BR)

Validate Brazilian vehicle plates in old (ABC-1234) and Mercosul (ABC1D23) formats. Auto-detects which one. Everything in your browser.

🔐

JWT Structure Validator

Verify whether a JWT has valid structure (3 segments), header and payload decodable in base64url, and shows exp, iat, nbf and any claims. Everything in your browser.

🔗

Slug Validator

Check whether a slug is in valid format (a-z, 0-9, hyphens, no accents, no spaces, no double or edge hyphens). Suggests a fix. Everything in your browser.

🌐

Domain Name Validator

Validate domain names per RFCs 1034/1035: max length, allowed chars, max 63-char labels, IDN. Supports subdomains. Everything in your browser.

🏷️

SemVer Validator

Validate a semantic version (semver.org) and show major, minor, patch, prerelease and build metadata separately.

⏰

Cron Expression Validator

Validate a cron expression (5 or 6 fields) and indicate which field is wrong. Accepts lists, ranges and steps.

🧾

JSON Schema Validator

Paste a JSON Schema and a document; check whether the document validates and which errors appear (path + message).

⚛️

GraphQL Query Validator

Check if a GraphQL query/mutation/subscription is syntactically valid and show the operation tree.

📚

OpenAPI Validator

Paste an OpenAPI 3.x document (YAML or JSON) and check required fields (info, paths, openapi). Lists errors and operation count.

📋

TOML Validator

Verify whether TOML content is syntactically valid. Error messages with line and column.

📅

ISO 8601 Date Validator

Verify whether a string is a valid ISO 8601 date/time (with timezone) and show the detected components.

🎨

CSS Selector Validator

Verify whether a CSS selector is valid and compute its specificity (a,b,c). Lists detected classes, IDs and elements.

🧭

XPath Validator

Verify whether an XPath expression is syntactically valid against a pasted HTML document. Counts how many nodes match.

🦀

Rust Regex Validator

Compile a regex using the Rust regex crate syntax subset. Flags unsupported features (lookarounds, backrefs).

🔣

Base64 Validator

Check whether a string is valid Base64 (with or without padding). Shows decoded size and whether content looks like UTF-8 or binary.

🔠

Base32 Validator

Check whether a string is valid Base32 (RFC 4648). Accepts = padding. Shows payload size in bytes.

📚

ISBN Validator

Validate ISBN-10 and ISBN-13 by check digit (hyphens and spaces accepted).

🗞️

ISSN Validator

Validate ISSN (8 digits, mod-11 check digit) used by journals.

🔗

DOI Validator

Validate DOI format (10.PREFIX/SUFFIX) per Crossref. Format only — does not check existence.

📱

IMEI Validator

Validate 15-digit IMEI by Luhn algorithm. Useful for mobile device IMEIs.

🚗

VIN Validator

Validate Vehicle Identification Number (17 chars) using position-9 check digit.

🏦

BIC / SWIFT Validator

Validate BIC/SWIFT format (8 or 11 alphanumeric chars).

💹

ISIN Validator

Validate 12-char ISINs (International Securities Identification Number).

🌍

ISO 3166 Country Code Validator

Validate ISO 3166-1 alpha-2 / alpha-3 country codes and resolve country name.

💱

ISO 4217 Currency Code Validator

Validate ISO 4217 currency codes (BRL, USD, EUR, JPY) and resolve currency name.

🗣️

ISO 639 Language Code Validator

Validate ISO 639-1 / ISO 639-2 language codes and resolve language name.

✅

Luhn Validator (generic)

Validate any numeric sequence using Luhn (mod 10) — used in credit cards, IMEI, ICCID and other IDs. Shows check digit.

📮

Portugal Postal Code Validator

Validate Portuguese postal codes (####-###) and identify region by first two digits (Lisboa, Porto, Coimbra, etc.).

🇵🇹

Portugal NIF Validator

Validate Portuguese NIF (Tax ID) — mod 11 check digit and valid prefixes (1, 2, 3, 5, 6, 8, 9).

🛂

Brazilian Passport Validator

Validate Brazilian passport format: 2 letters + 6 digits (AB123456). Format only — no authenticity check.

✈️

IATA Airport Code Validator

Validate IATA airport code format: 3 uppercase letters (GRU, JFK, CDG). Format check and common examples.

🛫

ICAO Airport Code Validator

Validate ICAO airport code format: 4 uppercase letters (SBGR, KJFK, EGLL). Country region prefixes included.

🇲🇽

Mexico RFC Validator

Validate Mexican RFC (Tax ID) — individual (13 chars) or company (12 chars). Format and check digit.

🇲🇽

Mexico CURP Validator

Validate Mexican CURP (Unique Population Registry Code) — 18 chars with specific format for name, date, sex, state and check digit.

🇪🇸

Spain DNI/NIE Validator

Validate Spanish DNI (National ID) and NIE (Foreigner ID) — checks control letter using official algorithm.

🇦🇷

Argentina CUIT Validator

Validate Argentine CUIT/CUIL (Tax/Labor ID) — 11 digits with type prefix and mod 11 check digit.

🇨🇱

Chile RUT Validator

Validate Chilean RUT (Tax ID) — number + check digit (0-9 or K) computed via mod 11. Accepts dotted/hyphenated format.

🌐

ISO 3166 Country Code Validator

Validate ISO 3166-1 alpha-2 (BR, US) and alpha-3 (BRA, USA) country codes and show the country name. ~250 countries.

📈

CUSIP Validator

Validate CUSIP (US securities ID) of 9 characters via check digit.

🎨

CSS Named Color Validator

Check if a string is a standard CSS named color and resolve hex.

📂

MIME Type Validator

Validate MIME type format per RFC 6838 (does not check existence).

🔌

TCP/UDP Port Validator

Validate TCP/UDP port number and classify range.

🌐

GPS Coordinates Validator

Validate GPS coordinates (lat in [-90,90], lng in [-180,180]).

🎵

ISRC Validator

Validate ISRC format (CC-XXX-YY-NNNNN) used in music recordings.

🎓

ORCID Validator

Validate ORCID (researcher identifier) with ISO 7064 mod 11-2 check digit.

✈️

IATA Airport Code Validator

Validate 3-letter IATA airport code and resolve name (top ~50 airports).

🚢

IMO Number Validator

Validate 7-digit IMO numbers (International Maritime Organization) with checksum.

📡

MMSI Validator

Validate 9-digit MMSI numbers used in maritime VHF and AIS.

📻

Amateur Radio Callsign Validator

Validate amateur radio callsign format (1-2 letters + digit + 1-3 letters).

✈️

IATA Airline Code Validator

Validate IATA airline codes (2 alphanumeric chars, e.g., LA, AA, G3).

🛫

ICAO Airport Code Validator

Validate 4-letter ICAO airport codes (different from IATA 3-letter).

📜

SPDX License Validator

Validate SPDX license IDs (MIT, Apache-2.0, GPL-3.0-only, ...) against ~150 entries.

🐍

Python PEP Number Validator

Validate Python PEP number format (1-4 digits, no leading zeros).

🪪

Brazilian CNH Number Validator

Validate Brazilian Driver License (CNH) registry number with check digit algorithm.

🪙

Base58 Validator

Validate Base58 (Bitcoin alphabet, no 0, O, I, l).

🔢

Base32hex Validator

Validate Base32hex encoding (RFC 4648, alphabet 0-9 A-V).

🆔

ULID Validator

Validate ULID format (26 Crockford-Base32 chars).

🌐

ASN (BGP) Validator

Validate Autonomous System Number (ASN) used in BGP, decimal or AS-prefixed.

₿

Bitcoin Address Validator

Validate Bitcoin address formats: P2PKH (1...), P2SH (3...), Bech32 (bc1/tb1).

Ξ

Ethereum Address Validator

Validate Ethereum address format and EIP-55 checksum when mixed-case.

◎

Solana Address Validator

Validate Solana address format (Base58, 32-44 chars).

TRX

TRON Address Validator

Validate TRON address format (T + 33 Base58 chars, total 34).

🇪🇺

EU VAT (per country) Validator

Validate EU VAT format per country (DE, FR, IT, ES, PT, NL, BE, AT…).

🏷️

MAC OUI (Vendor) Validator

Validate OUI (first 6 hex of MAC) and look up vendor (~30 major vendors).

📑

IETF RFC Number Validator

Validate IETF RFC number format (1-5 digits, no leading zeros).

🔒

Cipher IV (Hex) Validator

Validate hex IV size for AES (16), DES (8), ChaCha20 (12) bytes.

🐧

/etc/shadow line validator

Validate /etc/shadow line format (9 colon-separated fields).

🏦

BBAN format validator (per country)

Validate BBAN format per country (BR, DE, FR, GB, IT).

📊

EAN-8 Validator

Validate EAN-8 (8-digit) barcode used on small packaging.

📊

EAN-13 Validator

Validate EAN-13 (13-digit) retail barcode.

📊

UPC-A Validator

Validate UPC-A (12-digit) barcode used in US/Canada retail.

📊

ITF-14 Validator

Validate ITF-14 (14-digit) shipping carton barcode.

©️

Creative Commons License Validator

Validate short CC license identifiers (CC0, CC-BY, CC-BY-SA…) and show full name.

🎬

IMDb ID Validator

Validate IMDb ID format (tt followed by 7+ digits).

📮

BR CEP Format Validator

Validate Brazilian CEP format (8 digits, with or without hyphen).

⚕️

ICD-10 Code Format Validator

Validate ICD-10 code format (letter + 2 digits + optional dot + 1-4 alphanum).

📱

BR Mobile Number Validator (ANATEL)

Validate Brazilian mobile (ANATEL post-2016): DDD + 9 + 8 digits = 11 total.

🇧🇷

IBGE City Code Validator

Validate Brazilian IBGE city code format: 7 digits, first 2 = state code.

☎️

Brazilian DDD Validator

Validate Brazilian DDD area code (2 digits) and show region.

📮

CEP Range Validator

Identify Brazilian region from first 2 digits of CEP code.

🛬

IATA Airport (extended list)

Validate IATA airport code against ~120 major global airports with name+country.

✈️

Aircraft Registration Validator

Validate aircraft registration by country prefix (PT-XYZ BR, N123AB US, G-XXXX UK).

⏱️

Time Marker (ISO 8601) Validator

Validate ISO 8601 full timestamp format with UTC, offsets and millis.

🏢

PIB / Company Tax ID format Validator

Validate company tax ID formats: CIF Spain, NIPC Portugal, USt-IdNr Germany.

🎧

Pioneer DJ License Format Validator

Validate Pioneer DJ rekordbox license format: 4 groups of 4-5 alphanum separated by dashes.

🔤

UTF-8 Validator

Check if a byte sequence (in hex) is valid UTF-8 — for debugging file encoding. Decodes if valid.

🔢

Base91 Validator

Check if a string uses only Base91 characters (letters, digits and specific symbols like !#$%&()*+...). Format only.

🧲

Magnet Link Validator

Validate magnet link format (magnet:?xt=urn:btih:...) and extract params: hash, torrent name, trackers, size.

🔗

Data URI Validator

Validate Data URI format (data:[mediatype][;base64],data) and show mediatype, encoding and payload size.

🌐

TLD Validator

Check if a string is a known valid TLD (top-level domain) — covers major cTLDs (com, org, br, uk) and new gTLDs (app, dev, io).

🐦

Twitter/X @handle Validator

Validate Twitter/X handle format: 1-15 chars, letters, digits and _. Does not check availability.

🐙

GitHub Handle Validator

Validate GitHub username format: 1-39 alphanumerics and hyphens, no leading/trailing hyphens, no consecutive hyphens.

📍

Geographic Coordinate Validator

Accepts coordinates in multiple formats (decimal, DMS, with hemispheres) and validates lat/lon ranges.

🚩

Flag Emoji Validator

Check if an emoji is a valid country flag (Regional Indicator Symbols). Shows ISO 3166-1 alpha-2.

🆔

CPF/CNPJ Detector & Validator

Auto-detect if a string is CPF (11 digits) or CNPJ (14 digits) and validate its check digit.

🎟️

Promo Code Validator

Check a promo code against configured format: length, allowed chars (alnum/hyphen) and optional Luhn checksum.

🏦

Country Bank Account Validator

Validate basic bank account format by country: BR (X-D), PT (21-digit NIB), US (9-digit routing), CA, UK.

🇵🇹

Portugal IBAN Validator

Validate Portuguese IBANs (PT50): format and mod-97 checksum. Shows agency, account and check digits.

🇪🇸

Spain IBAN Validator

Validate Spanish IBANs (ES) — 24 chars with mod-97 checksum and bank/branch codes. For international billing systems.

🇩🇪

Germany IBAN Validator

Validate German IBANs (DE) — 22 chars with BLZ (8 digits) and account number. Uses standard mod-97.

🍃

MongoDB ObjectId Validator

Validate that a string is a valid MongoDB ObjectId: 24 hex chars. Shows embedded timestamp (first 4 bytes).

🆔

Generic ObjectId Validator

Validate generic ObjectId formats used in NoSQL DBs: MongoDB (24 hex), Couchbase (UUID), Cassandra (TimeUUID).

🔍

UUID Version Detector

Detect a UUID version (v1-v8) from the version and variant fields. Also shows embedded timestamp in UUIDv1/v6/v7.

🔢

Base32 Hex Validator

Check if a string uses only the Base32 Hex alphabet (0-9, A-V). DNS variant per RFC 4648.

🔢

Base32 Crockford Validator

Check if a string uses only the Base32 Crockford alphabet (omits I, L, O, U to avoid ambiguity). Common in human-readable IDs.

₿

Bitcoin Address Validator

Validate Bitcoin addresses in legacy (P2PKH 1...), P2SH (3...) and Bech32 (bc1...) formats. Format only — no blockchain lookup.

Ξ

Ethereum Address Validator

Validate Ethereum addresses (0x + 40 hex). Detects EIP-55 checksum (mixed case) and indicates if the address is valid with checksum.

📮

PT Postal Code Full Validator

Full Portugal postal code validator: ####-### format + district detection (Lisboa, Porto, Coimbra, etc.) based on first 4 digits.

📮

BR Postal Code Validator with State

Validate Brazilian postal code (#####-###) format and identify approximate state by first 3 digits. No external lookups.

📱

Country-aware Cellphone Validator

Validate mobile phone number for chosen country (BR, US, PT, ES, AR, MX). Country-specific rules.

📅

Date Format Validator (ISO/Common)

Check if a date is in ISO 8601 or common formats (YYYY-MM-DD, DD/MM/YYYY, MM/DD/YYYY). Auto-detects format.

🔗

UTM Parameters Validator

Validate URL with UTM params (utm_source, medium, campaign, content, term). Checks presence, format (lowercase), no spaces.

📊

Google Analytics ID Validator

Validate Google Analytics ID formats: UA-XXXXX-Y (universal) and G-XXXXXXXXXX (GA4). Identifies type.

🏷️

Google Tag Manager ID Validator

Validate GTM ID format: GTM-XXXXXXX (7 alphanumeric chars after GTM-). For implementation audits.

💰

Google Ads Customer ID Validator

Validate Google Ads Customer ID format: 10 digits with hyphens (XXX-XXX-XXXX). Format only — no existence check.

📷

Meta Pixel ID Validator

Validate Meta Pixel ID format (Facebook/Instagram): 15-16 numeric digits. Checks integrity and simple checksum.

💳

Stripe Public Key Validator

Validate Stripe public key format: pk_live_... (production) or pk_test_... (test). Checks prefix, length, alnum charset.

🏦

PayPal Client ID Validator

Validate PayPal Client ID format: 80 alphanumeric chars (prefix A for sandbox/live). Format only.

🏦

Itaú Bank Account Validator

Validate Itaú checking account format and check digit: 4-digit branch + 5-digit account + 1 DV. Self-check algorithm.

🏦

Bradesco Bank Account Validator

Validate Bradesco account format: 4-digit branch + 7-digit account + 1 DV. Checks format and bank patterns.

🏗️

BDI Range Validator (TCU)

Check if a BDI (Indirect Costs) value is within the reasonable range (15-30%) recommended by TCU for construction.

📑

Quote Number Validator

Validate common quote number formats (PREFIX-YYYY-NNNNN). Year must be 2000-2099 and sequence > 0.

📋

CEST Code Validator

Validate CEST code format (XX.XXX.XX), 7 digits. Checks if segment (XX) is in 01-28 (official).

🏷️

NCM Code Validator

Validate NCM format (8 numeric digits). Decomposes into chapter (2), position (2), subposition (2), item (2). No official table check.

🇧🇷

IBGE UF Code Validator

Validate IBGE UF code (2 digits: 11-53). Covers the 27 official codes and shows UF and name.

🏙️

IBGE Municipality Code Validator

Validate IBGE municipality code format (7 digits: UF + 5 inner). Checks if first 2 are a valid UF.

🤟

LIBRAS Code Validator

Validate simple LIBRAS (Brazilian Sign Language) transcription using basic SignWriting notation.

🆔

CGC (Old CNPJ) Validator

Validate format and check digit of CGC (former Brazilian Tax Registry, predecessor to CNPJ). Same math rules.

🏢

CNAE Section Validator

Validate if a 7-digit CNAE code belongs to a section (A-U). Shows the corresponding CNAE 2.0 section.

🧾

Receipt Number Validator

Validate common receipt number formats (REC-YYYY-NNNNN or REC.NNNNN). Accepts variations with dots and dashes. Validates year.

💳

Payment Term Code Validator

Validate common payment term codes: CASH, 30D, 30/60, 30/60/90, 60D, etc. Decomposes installments.

🛒

Order Number Validator

Validate common e-commerce order number formats: ORD-XXXX, ORDER-NNNN, #N alphanumeric. Auto-detects type.

🚗

Vehicle Plate Validator (Mercosur + old)

Validate plate formats: old (AAA-9999) and Mercosur (AAA9A99). Auto-detects format.

📬

Correios Tracking Code Validator

Validate Correios tracking format (AA999999999BR) and compute DV with official algorithm.

🏠

IPTU (Property Tax) Number Validator

Validate IPTU (Brazilian property tax) registration format — varies by city, generally 8-15 digits. Generic format check.

🚗

IPVA Code Validator

Validate IPVA code (Brazilian Vehicle Tax), generated from RENAVAM. Format and digits check.

🚓

Traffic Violation Code Validator (DETRAN)

Validate Brazilian traffic violation code — UF-NN-NNNNNNNN format. Pattern check.

📜

Credit Instrument Number Validator

Validate format of common credit instrument numbers: invoice, promissory note, check, bill of exchange.

🚗

Legacy RENAVAM Validator (9 digits)

Validate the old RENAVAM format (9 digits) used before 2013. For validating legacy vehicle database data.

📚

ISBN-13 with Checksum Validator

Validate ISBN-13 (13 digits) — modern format since 2007. Includes 978/979 prefix and EAN-13 check digit.

📰

Real ISSN Validator with Checksum

Validate ISSN (8 digits: NNNN-NNNX where X may be 0-9 or X). Format check and MOD 11 algorithm.

📦

Shopee/Mercado Envios Tracking Validator

Validate Shopee Brazil (BR + 12 digits) and Mercado Envios (BR + 14 digits) tracking codes. Auto-detect.

⏱️

ISO 8601 Time Strict Validator

Strictly validate ISO 8601 duration / instant strings.

📤

Base91 Validator

Validate that a string uses only Base91 alphabet characters.

🏦

IBAN Length Validator

Validate IBAN by country prefix and length.

🏷️

EAN-8 Checksum Validator

Validate an EAN-8 barcode with checksum.

🏷️

EAN-13 Checksum Validator

Validate an EAN-13 barcode with checksum.

💳

CC Expiry Validator

Validate credit card expiry in MM/YY format.

🆔

RG-UF Format Validator

Validate Brazilian RG format with UF (ex: 12.345.678-9/SP).

🆔

RG-SP Format Validator

Validate São Paulo RG format (8-9 digits + check digit).

🆔

RG-RJ Format Validator

Validate Rio de Janeiro RG format.

🆔

RG-MG Format Validator

Validate Minas Gerais RG format.

🆔

PIS Format Validator

Validate PIS/PASEP format and checksum.

🏗️

CEI Format Validator

Validate CEI format (12 digits).

🏢

CNAE Format Validator

Validate CNAE 2.3 code format (7 digits).

📮

CEP UF Validator

Validate CEP and infer UF from prefix ranges.

💸

ICMS Rate Validator

Validate ICMS rate as percentage (0-25).

👷

CBO Format Validator

Validate CBO 2002 code format (6 digits).

🏢

CNPJ Base/Branch Validator

Validate just 8 base + 4 branch digits of CNPJ (no DV).

🆔

CPF + Issue Date Validator

Validate extended CPF + DDMMAAAA format.

🏦

FEBRABAN Bank Code Validator

Validate FEBRABAN bank code (3 digits 001-999).

🏦

Bank Branch Validator

Validate Brazilian bank branch format (4 digits + optional DV).

🇯🇵

Japan Postal Validator

Validate Japanese postal code (〒NNN-NNNN).

🇬🇧

UK Postcode Validator

Validate UK postcode (SW1A 1AA pattern).

🇫🇷

France Postal Validator

Validate French postal code (5 digits).

🇩🇪

Germany Postal Validator

Validate German PLZ (5 digits).

🇨🇦

Canada Postal Validator

Validate Canadian postal code (A1A 1A1).

🇺🇸

US ZIP Validator

Validate US ZIP code (5 or 5+4 digits).

🛂

US Passport Format Validator

Validate US passport format (9 alphanumeric).

🇺🇸

US SSN Format Validator

Validate US SSN format (3-2-4 digits).

🇺🇸

US ITIN Format Validator

Validate US ITIN format (9XX-XX-XXXX).

🇺🇸

US EIN Format Validator

Validate US EIN format (2-7 digits).

🇨🇦

Canada SIN Format Validator

Validate Canadian SIN format (3-3-3 digits).

🏦

SWIFT/BIC Completo

Valida código SWIFT/BIC (8 ou 11 caracteres).

🇬🇧

VAT UK

Valida número VAT do Reino Unido (formato GBxxxxxxxxx).

🇩🇪

VAT Alemão

Valida número VAT alemão (DEXXXXXXXXX).

🇫🇷

VAT Francês

Valida número VAT francês (FRXXXXXXXXXXX).

🇮🇹

VAT Italiano

Valida número VAT italiano (ITXXXXXXXXXXX).

🇪🇸

VAT Espanhol

Valida formato NIF/CIF espanhol (ESXXXXXXXXX).

🇵🇹

VAT Português

Valida NIF português (PTXXXXXXXXX, 9 dígitos).

🇺🇸

TIN EUA Formato

Valida formato US TIN (SSN xxx-xx-xxxx ou EIN xx-xxxxxxx).

🇦🇺

ABN Australian

Valida formato Australian Business Number (11 dígitos).

🇮🇳

IFSC India

Valida formato IFSC bancário indiano (4 letras + 0 + 6 alfanum).

🎾

Validar Tiebreak Tênis

Verifica se um placar de tiebreak (X-Y) é válido: ≥7 e diferença ≥2.

🔑

OAuth Scope Checker

Verifica se um scope solicitado está nos scopes concedidos (separados por espaço).

⏱️

JWT Validador exp/nbf/iat

Valida timestamps exp, nbf e iat de um JWT (sem verificar assinatura).

🛡️

JWT Algoritmo: Policy Checker

Verifica se o "alg" do header JWT está em uma allowlist segura (rejeita "none" e HS256 em contextos JWE).

🆔

JWT JTI Format Verifier

Valida formato do JTI (recomendado: ≥16 chars, alfanumérico ou UUID).

🔑

Validador client_id / client_secret

Valida formato comum (alfanumérico, comprimento mínimo) de client_id e client_secret.

₿

Formato de Endereço Bitcoin

Detecta o formato de endereço Bitcoin pelo prefixo: legacy (P2PKH), P2SH, segwit bech32 (P2WPKH/P2WSH) ou taproot (P2TR).

🔷

Checksum EIP-55 Ethereum

Verifica o checksum EIP-55 simplificado: endereços com mistura de maiúsculas/minúsculas devem seguir o padrão de capitalização.

🕒

Validador Last-Modified

Valida se um header Last-Modified está no formato RFC 7231 (HTTP-date).

📅

Validador Header Expires

Valida o header Expires (RFC 7234) e calcula tempo até expirar.

⌨️

WCAG Atalho de Teclado

Verifica se atalho de teclado segue WCAG 2.1.4 (não deve ser tecla única sem trigger ou opção desativar).

🖼️

Validador Alt-Text

Valida tamanho de alt text — limite recomendado ~125 caracteres (leitores de tela cortam).

📋

Validador Hierarquia H1-H6

Valida sequência de headings (não deve pular níveis: ex H1→H3 é erro).

🌍

Verificador hreflang vs lang

Checa consistência entre <html lang="..."> e link[hreflang] — devem casar.

📜

Checker Seções Política Privacidade

Verifica quais seções obrigatórias estão presentes em uma política de privacidade.

📚

ISBN-10 Validator

Validates ISBN-10 via mod-11 check digit per ISO 2108.

🏷️

EAN-8 Validator

Validates EAN-8 barcodes computing the check digit per GS1 spec.

📦

ITF-14 Validator

Validates ITF-14 codes (cartons/shipping) with GS1 mod-10 check digit.

🎼

ISMN Validator

Validates ISMN (International Standard Music Number) check digit per spec.

💷

SEDOL Validator

Validates SEDOL codes (7 chars, LSE) with weighted check digit.

📲

IMEI Validator (Luhn)

Validates a 15-digit IMEI via Luhn algorithm without TAC lookup.

🇩🇪

IBAN DE Validator

Validates German IBAN (DE) checking length 22 and mod-97 check.

🥖

IBAN FR Validator

Validates French IBAN (FR) checking length 27 and mod-97 check.

🇪🇸

IBAN ES Validator

Validates Spanish IBAN (ES) checking length 24 and mod-97 check.

🇮🇹

IBAN IT Validator

Validates Italian IBAN (IT) checking length 27 and mod-97 check.

🧾

CFOP Validator

Validates Brazilian CFOP — 4 digits with valid prefix (1-7).

🏦

Detailed BIC/SWIFT Validator

Validates BIC format (8 or 11 chars) and extracts bank, country, location and branch — used in international wires.

💹

FIGI Instrument Validator

Validates Financial Instrument Global Identifier (FIGI) — 12 characters with modulus 10 check digit.

🏢

LEI Validator (Legal Entity Identifier)

Validates 20-character LEI with ISO 17442 check digits — global legal entity identifier.

🇺🇸

EIN US Validator (Employer ID Number)

Validates US EIN format (XX-XXXXXXX) and identifies the IRS issuing campus by the first two digits.

🇦🇺

TFN Australia Validator

Validates Australian Tax File Number of 8 or 9 digits using official ATO check digit algorithm.

🏦

ABA Routing Number Validator

Validates 9-digit ABA Routing Number used by US banks with the 3-7-1 checksum algorithm.

🇵🇱

NIP Poland Validator

Validates Polish NIP (10 digits) with official checksum — Poland equivalent of business tax ID.

🇦🇷

CUIL Argentina Validator

Validates Argentine CUIL (Código Único de Identificación Laboral) with check digit — used in payroll.

🆔

PESEL Poland Validator

Validates Polish PESEL (11 digits) with checksum and extracts birth date and sex from the number.

📇

NINo UK National Insurance Validator

Validates UK National Insurance Number (NINo) with prefix/suffix rules — format AA NN NN NN A.

🎬

ISAN Audiovisual Validator

Validates ISAN (International Standard Audiovisual Number) — 24 hex + 2 check digits for films and episodes.

🎼

ISMN Sheet Music Validator

Validates ISMN (International Standard Music Number) — printed sheet music identifier, prefix M or 979-0.

📦

ITF-14 Checksum Validator

Validates ITF-14 logistics box code with GS1 check digit calculation — 14 digits.

📔

Passport MRZ Validator

Validates ICAO 9303 passport machine-readable zone (MRZ) with checksums and extracts country, name, expiry.

💊

Anvisa Drug Registration Validator

Validates Anvisa drug registration code format (13 digits with check digit per the official table).

🏥

CNES Health Facility Validator

Validates Brazilian National Registry of Health Facilities (CNES) — 7 digits.

💄

Anvisa Cosmetic Notification Validator

Validates Anvisa cosmetic notification number format (category + sequential + digit) and extracts the category.

🌆

IATA City Code Validator

Validates 3-letter IATA city code (not airport) and cross-references against the metropolitan code list.

✈️

ICAO Airport Code Validator

Validates 4-letter ICAO airport code and identifies the country by its first letter (S=South America etc.).

🚢

MMSI Detailed Validator

Validates a 9-digit maritime MMSI and identifies type (ship, coast station, SAR, group) from the first digits.

🏪

MCC (Card) Validator

Validates 4-digit MCC codes used by card networks and shows the category description (e.g., 5411 = Grocery Stores).

💳

Card BIN Validator

Identifies card brand (Visa, Master, Elo, Hipercard, Amex, JCB etc.) and type (credit/debit) from the first 6-8 digits of the card.

🇺🇸

US ZIP Validator

Validates ZIP-5 and ZIP+4 codes from the United States with regex and state prefix table, detecting state/ZIP mismatches.

🇨🇦

Canada Postal Code Validator

Validates the A1A 1A1 Canadian format, rejects forbidden letters (D, F, I, O, Q, U) and identifies the province by first letter.

🌐

ISO 639 Language Code Validator

Validate ISO 639-1 (2-letter), 639-2 (3-letter) and 639-3 language codes with lookup of the corresponding name and language family.

✓

Luhn Online Validator

Validate any number using the Luhn algorithm (credit cards, IMEI, ICCID, various codes) and generate missing check digit.

📱

ICCID SIM Validator

Validate the ICCID (Integrated Circuit Card Identifier) of SIM chips (19-20 digits) with Luhn digit check and carrier identification.

🇳🇱

Dutch BSN Validator

Validate 9-digit Dutch Burgerservicenummer with the 11-test rule (weighted sum mod 11).

🇮🇹

Italian Codice Fiscale Validator

Validate Italian Codice Fiscale (16 chars, final checksum letter) — used in documents and contracts in Italy.

🇵🇪

Peruvian RUC Validator

Validate Peruvian RUC (11 digits, mod 11 checksum) — SUNAT Registro Único de Contribuyentes.

₿

Bech32 / Bech32m Validator

Validate Bech32/Bech32m addresses (used in Bitcoin SegWit, Lightning, Cosmos, Polkadot) with BCH checksum and HRP separation.

🆔

CUID2 Validator

Validate IDs in CUID2 format (collision-resistant, 24 chars, base36, letter prefix), returning whether syntactically valid.

📋

SPDX Expression Validator

Validate SPDX license expressions ("(MIT OR Apache-2.0) AND BSD-3-Clause") with official parser, useful for package.json and Cargo.toml.

📡

RSS / Atom Feed Validator

Validate RSS 2.0 and Atom 1.0 by pasting XML — checks required elements, RFC dates, unique GUID/id and links W3C-style errors.

📧

RFC 5322 Email Deep Validator

Strict RFC 5322 validator that checks local-part, quoted-strings, domain literals, nested comments and shows the address AST.

📇

vCard / VCF Deep Validator

Validate pasted vCards 3.0/4.0, checking paired BEGIN/END, required properties (FN, VERSION), TYPE params and ISO dates.

🇪🇺

EORI (EU) Validator

Validate the format of EORI (Economic Operators Registration and Identification) numbers used in EU customs.

🔄

PTR Record Format Validator

Check whether a PTR record is well-formed (in-addr.arpa for IPv4, ip6.arpa for IPv6) and generate the expected reverse name.

🔐

COSE Key Format Validator

Validate COSE key format (RFC 8152) in CBOR/hex, identifying type (EC2/OKP/Symmetric), curve and associated algorithm.

✉️

Strict SPF Record Validator

Validate SPF record syntax and semantics (RFC 7208) — detect lookup overflow, bad syntax and final all.

⏰

Strict Quartz Cron Validator

Validate Quartz Scheduler cron expressions (6 or 7 fields) with ? L W # and complex ranges.

🔗

IPv6 Zone ID Validator

Validate IPv6 addresses with Zone ID (fe80::1%eth0, RFC 6874) — link-local scoped addresses and URL form.

🇮🇪

Eircode (Ireland) Validator

Validates Irish Eircode format (7 alphanumeric characters, e.g. D02 X285) with space normalization.

⚗️

CAS Number (Chemical) Validator

Validates CAS Registry Number (xxxxxxx-xx-x format) with official checksum used to identify chemical substances.

🇷🇸

JMBG (Serbia/Yugoslavia) Validator

Validates JMBG (Jedinstveni Maticni Broj Gradjana) 13-digit personal identifier from former Yugoslavia countries.

📦

SSCC Barcode Validator

Validates SSCC (Serial Shipping Container Code) codes of 18 digits used in logistics for load unit identification.

🏢

GLN (Global Location Number) Validator

Validates GLN (Global Location Number) codes of 13 digits from the GS1 standard, used to identify company addresses and facilities.

🚗

VIN Validator (Country & Brand Decoder)

Decodes a 17-character VIN showing country of origin, manufacturer (WMI), model year and validating the check digit per ISO 3779 standard.

🔤

ISO 15924 Script Validator

Validates ISO 15924 codes for writing systems (Latn, Cyrl, Arab, Hans) with a table and description.

🗺️

ISO 3166-2 Subdivision Validator

Validates ISO 3166-2 subdivision codes (BR-SP, US-CA, FR-IDF) and returns country and unit name.

📋

CEF / LEEF Format Validator

Validates Common Event Format (ArcSight) and LEEF (QRadar) event structure, extracting header and extensions.

🤖

AI Bots Blocking Validator

Paste your robots.txt and see which AI bots (GPTBot, ClaudeBot, PerplexityBot, GoogleExtended) are blocked or allowed.

🏷️

BEM Naming Validator

Validate CSS classes against the BEM convention (block, block__element, block--modifier, block__element--modifier) flagging violations.

📝

ICU MessageFormat Syntax Validator

Analyze ICU MessageFormat messages detecting malformed placeholders, plurals missing the other case, missing select branches and invalid types.

👷

Brazilian CBO Code Validator

Validate codes from the Brazilian Classification of Occupations (CBO 2002) with 6 digits, checking major-group/subgroup/family structure.

📱

IMSI Validator (MCC/MNC)

Validate IMSI (International Mobile Subscriber Identity) numbers with 15 digits, breaking down MCC (country), MNC (operator) and MSIN.

🪐

IPFS CID Format Validator

Verify IPFS CID format v0 (Qm...) and v1 multibase, returning codec, multihash, digest size, and version.

🔄

YAML Anchor Circular Reference Validator

Detect anchors with circular references (loops) in YAML documents, common in complex Helm/Kubernetes configurations.

🧪

SMILES Chemical Notation Validator

Verify SMILES string syntax (atoms, bonds, rings, isomerism, parentheses). Highlights tokenization and valence errors.

🍞

Baker's Percent Recipe Validator

Verify that a baker's percentage recipe sums correctly (flour=100%, total of others consistent). Detects proportion errors.

🔌

EIA-96 Resistor Format Validator

Checks if a string follows the EIA-96 pattern (two digits from table 01-96 + multiplier letter A-Z). Reports specific error.

📡

ITU Callsign Country Validator

Checks if a ham radio callsign matches the ITU prefix assigned to a country (e.g. PY Brazil, K USA, JA Japan). Displays country.

🏦

IBAN MOD-97 Batch Validator

Paste IBAN list (up to 200), validate each via MOD-97 algorithm and show country, bank (BBAN), check digits. Export CSV with results.

🚆

UIC Railway Vehicle Number Validator (12 digits)

Validate a UIC rolling-stock number (12 digits) by computing the Luhn-like check digit per UIC Leaflet 438.

🆔

DUNS Number Format Validator

Validate the 9-digit Dun & Bradstreet D-U-N-S Number, accepting hyphens and spaces. Rejects reserved placeholders like 000000000 and 999999999.

🇦🇹

Austrian SVNR Validator

Validates Austrian Sozialversicherungsnummer (10 digits, with weighted check digit) used in SaaS and HR.

🇸🇪

Swedish Personnummer Validator

Validates Swedish personnummer (YYMMDD-XXXX with Luhn) including date and gender check.

🇫🇮

Finnish Henkilötunnus Validator

Validates Finnish personal identity code (DDMMYYCZZZQ) with date, century separator and alphanumeric checksum.

🔢

Damm Checksum Validator

Compute and validate the Damm (2004) check digit — a totally anti-symmetric quasigroup algorithm detecting 100% of single-digit typos and adjacent transpositions. Simpler than Verhoeff: a single 10×10 op table, no permutations.

🇶🇦

Qatar QID Validator

Validate the Qatari ID (QID) — national 11-digit number in C YY CC S SSSSS layout: century digit (2=1900s, 3=2000s), 2-digit year of birth, country code, series digit and serial. Structural validation — no official checksum.

🖼️

PDF to Images

Convert PDF pages to individual PNG images. Everything in your browser via pdf.js.

🎨

Pixel Art Converter

Convert an image to pixel art by reducing resolution and color palette. Stylized retro output.

💱

Currency Converter

Convert between major currencies (USD, EUR, BRL, GBP, JPY, ARS) using live rates from open.er-api.com.

⠿

Braille Converter

Converts text between Latin alphabet and Braille (Unicode 6-dot U+2800 to U+28FF). Bidirectional.

🎬

Subtitle Converter

Converts subtitle files between SRT and VTT formats. Useful for reusing subtitles across platforms.

Aa

Case Converter

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg and iNvErTeD. Runs in your browser.

🧹

Format CPF

Format Brazilian CPF numbers by adding or removing the 000.000.000-00 mask. Accepts a list with one CPF per line. Runs in your browser.

🧾

Format CNPJ

Format Brazilian CNPJ numbers by adding or removing the 00.000.000/0000-00 mask. Accepts a list with one CNPJ per line. Runs in your browser.

🔄

Base64 Converter

Encode text to Base64 or decode Base64 strings back to the original. Free online tool with no server required.

🔗

URL Encode / Decode

Encode text for safe use in URLs (percent-encoding) or decode URL-encoded strings back to the original. Processed in the browser.

01

Binary Code Translator

Convert text to binary code (0s and 1s) and vice versa. Supports any ASCII character. Processed in the browser.

⏱️

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Shows local time and UTC.

📡

Morse Code Converter

Convert text to Morse code and vice versa. Supports letters, numbers and punctuation. Instant result in the browser.

🔢

Number Base Converter

Convert numbers between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16). Instant bidirectional conversion.

📏

Measurements Converter

Convert between units of length, mass, temperature, area, volume and speed. Instant result in the browser.

🔑

Caesar Cipher

Encode and decode messages with the Caesar Cipher. Choose the shift (1–25) and convert text instantly in the browser.

🎨

Color Converter

Convert colors between HEX, RGB, HSL and CMYK instantly. Enter any format and get equivalents in the others. Live color preview.

💾

Byte Size Converter

Convert file sizes between bits, bytes, KB, MB, GB, TB and PB. Supports SI (decimal) and IEC (binary) scales. Instant result.

📐

Angle Converter

Convert angles between degrees (°), radians (rad), gradians (grad) and turns. Instant result in the browser.

📅

Date Format Converter

Convert dates between the most common formats: dd/mm/yyyy, yyyy-mm-dd, mm/dd/yyyy, ISO 8601 and Unix timestamp.

🔣

Text ↔ Hex Converter

Convert ASCII text to hexadecimal values and vice versa, character by character. Useful for debugging, encoding and protocol analysis.

🔢

Text ↔ Decimal Converter

Convert ASCII text to decimal codes and vice versa. Each character is represented by its decimal value in the ASCII table.

🔢

Numeric Bases Converter

Convert numbers between binary (base 2), decimal (base 10), hexadecimal (base 16) and octal (base 8). Type in any field for instant conversion in the others.

🔄

XML to JSON

Convert XML data to JSON format quickly and easily.

🔄

JSON to XML

Convert JSON data to XML format quickly and easily.

🔄

YAML to JSON

Convert YAML data to JSON format.

🔄

JSON to YAML

Convert JSON data to YAML format.

🔄

Markdown to HTML

Convert Markdown text to HTML code.

🔄

HTML to Markdown

Convert HTML code to Markdown text.

🔄

Base32 Encoder / Decoder

Encode text to Base32 or decode Base32 strings back to the original.

🔄

Base58 Encoder / Decoder

Encode text to Base58 or decode Base58 strings back to the original. Used in cryptocurrencies like Bitcoin.

🖼️

Image to Base64

Convert images to Base64 strings for use in CSS, HTML or APIs. Supports PNG, JPG, GIF, SVG and WebP.

🖼️

Base64 to Image

Convert Base64 strings back to an image to visualize and download.

📏

Unit Converter

Convert units of length, mass, temperature, area, volume and speed. Supports metric and imperial systems with instant conversion.

🌡️

Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine in real time. Simple, fast and processed directly in your browser.

⚛️

HTML to JSX

Convert HTML to React JSX automatically. Transforms class→className, for→htmlFor, converts attributes to camelCase and closes void tags.

🖼️

Image Format Converter

Convert images between PNG, JPEG and WebP formats directly in your browser. No server upload — complete privacy.

🛩️

NATO Phonetic Alphabet

Convert words to the NATO phonetic alphabet (Alpha, Bravo, Charlie...) used by the military, pilots and radio operators. Useful to spell names or codes over the phone clearly. Everything in your browser.

🅃

JSON to TypeScript

Convert a JSON to TypeScript interfaces with automatically inferred types. Detects strings, numbers, booleans, arrays, nested objects and union types. Everything in your browser.

🌐

Punycode Encoder/Decoder

Convert IDN domains (with accents or non-ASCII characters) to Punycode (xn--...) and back. Useful for registering international domains and validating emails. Everything in your browser.

🐹

JSON to Go Struct

Convert a JSON to a Go struct with `json:` tags and inferred types. Detects strings, ints, floats, bools, slices and nested structs. Everything in your browser.

🧭

Coordinates Converter

Convert geographic coordinates between decimal degrees (DD) and degrees-minutes-seconds (DMS). Handles formats like -23.55 ↔ 23°33'00"S. Everything in your browser.

🔢

IPv4 Format Converter

Convert IPv4 addresses between formats: dotted decimal (192.168.1.1), integer (3232235777), hexadecimal (0xC0A80101) and binary. Everything in your browser.

⚙️

JSON to TOML

Convert JSON to TOML, the readable config format used by Cargo (Rust), pyproject.toml, Hugo, etc. Supports strings, numbers, booleans, arrays and nested tables. Everything in your browser.

🔄

TOML to JSON

Convert TOML to JSON. Supports strings, integers, floats, booleans, dates, arrays and nested tables. Useful to inspect configs or pipe them into scripts. Everything in your browser.

📄

CSV to JSON

Convert CSV to JSON. The first row becomes object keys, the rest become array items. Supports separators , ; and \t. Auto-detects numbers and booleans. Everything in your browser.

📋

CSV to Markdown Table

Convert CSV to a Markdown table ready for READMEs, docs and Wikis. Auto-detects separator (comma, semicolon or tab) and supports per-column alignment. Everything in your browser.

🐘

JSON to PHP Array

Convert JSON to a PHP array in "short" (`[]`) or "long" (`array()`) syntax. Useful to generate config and seed files in Laravel/Symfony projects. Everything in your browser.

☕

JSON to Java Class

Convert JSON to a Java POJO class with getters/setters and inferred types. Supports nested classes and arrays as List. Everything in your browser.

🔷

JSON to C# Class

Convert JSON to a C# class with auto-implemented properties. Detects primitive types, lists, arrays and nested objects. Useful for .NET/Unity. Everything in your browser.

💬

BBCode to HTML

Convert BBCode (from forums like phpBB and vBulletin) to HTML: [b], [i], [u], [url], [img], [quote], [code], [list]. Everything in your browser.

🥇

Ordinal Number Converter

Convert cardinal numbers to ordinals — in Portuguese ("1º", "primeiro") and English ("1st", "first"). Everything in your browser.

😀

Emoji Shortcode Converter

Convert between shortcodes (`:smile:`, `:heart:`, `:rocket:`) and Unicode emojis (😄 ❤️ 🚀). Both directions, covering the most-used Slack, Discord and GitHub shortcodes. Everything in your browser.

🖨️

RGB ⇄ CMYK Converter

Convert colors between RGB (0-255) and CMYK (0-100%). Includes K = 1 − max(R,G,B)/255 and converts in both directions. Everything in your browser.

📏

Feet/Inches ⇄ Meters

Convert between feet/inches (5'10") and meters (1.78 m). Supports combined input and configurable rounding. Everything in your browser.

⚖️

Force and Pressure Converter

Convert between Newton, kgf, lbf (force) and Pascal, bar, psi, atm, mmHg, mca (pressure). Everything in your browser.

🐎

Watts ⇄ Horsepower (HP/CV)

Convert power between Watts, kW, HP (mechanical, metric) and CV. 1 CV ≈ 735.5 W; 1 HP ≈ 745.7 W. Everything in your browser.

🔁

cURL to fetch()

Paste a cURL command and generate the JavaScript fetch() equivalent. Supports -X, -H, -d, --data-raw, querystring and cookies. Everything in your browser.

🐇

cURL to HTTPie

Paste a cURL command and generate the HTTPie equivalent (http/https) — clean syntax for the terminal. Everything in your browser.

🔗

JSON ⇄ Query String Converter

Convert a flat JSON object to a query string (?a=1&b=2) and vice versa. Supports a[]=1&a[]=2 array style. Everything in your browser.

📦

JSON to FormData

Convert a JSON object into JavaScript code that builds a FormData (multipart/form-data) — ready to send via fetch(). Everything in your browser.

🤖

JSON to Kotlin Data Class

Convert JSON to a Kotlin data class with inferred types. Supports nested classes and List&lt;T&gt;. Useful for Android projects. Everything in your browser.

🍏

JSON to Swift Struct

Convert JSON to a Codable Swift struct. Supports primitive types, arrays and nested structs. Useful for iOS projects. Everything in your browser.

🐍

JSON to Python (dataclass)

Convert JSON to a Python dataclass with type hints. Supports List, Optional and nested classes. Everything in your browser.

🔢

Arabic Numerals Converter

Convert between Western digits (0-9) and Eastern Arabic (٠-٩) or Persian (۰-۹). Useful for internationalization. Everything in your browser.

🦀

JSON to Rust struct

Paste JSON and get Rust structs with Serialize/Deserialize derives (serde). Types inferred automatically.

🎯

JSON to Dart class

Convert JSON into Dart classes with fromJson/toJson and null-safe types. Useful for Flutter.

💎

JSON to Ruby class

Convert JSON into a simple Ruby class with attr_accessor and a constructor that takes a hash.

🛡️

JSON to Zod schema

Generate a Zod schema (TypeScript) from a JSON sample, inferring primitives, arrays and nested objects.

✔️

JSON to Yup schema

Build a Yup schema from JSON, with string/number/boolean/array/object types inferred from the example.

📐

JSON to JSON Schema

Infer a JSON Schema (Draft 2020-12) from a sample JSON, listing required, type and properties.

🍃

JSON to Mongoose Schema

Generate a Mongoose Schema (Node.js) from JSON, inferring types and marking fields as required.

🐬

JSON to MySQL CREATE TABLE

Convert a JSON array into a MySQL CREATE TABLE, inferring VARCHAR, INT, DECIMAL, DATETIME from samples.

📦

JSON to .proto

Generate a Protocol Buffers (proto3) definition from JSON, with sequential field numbering.

🔷

JSON Schema to TypeScript

Paste a JSON Schema and receive matching TypeScript interfaces (objects, arrays, enums).

📮

cURL to Postman Collection

Convert a cURL command into a Postman Collection v2.1 (JSON) ready to import. Supports -H, -d, --data-urlencode and -X.

🐘

cURL to PHP

Convert a cURL command into PHP code (curl_init / curl_setopt_array). Headers, body and method preserved.

🐍

cURL to Python requests

Convert a cURL command into Python code using the requests library, with headers, params, json and auth.

🌊

HAR to cURL list

Paste a HAR (HTTP Archive) file and receive one cURL per request. Useful to replay DevTools traffic.

🗂️

HAR to Postman Collection

Convert a HAR (DevTools) into a Postman Collection v2.1 with all requests grouped by host.

🌡️

Pressure Converter

Convert pressure between Pa, kPa, bar, psi and atm.

⚡

Energy Converter

Convert energy between Joule, calorie, kcal, kWh and electron-volt (eV).

📡

Frequency Converter

Convert frequency between Hz, kHz, MHz, GHz and THz.

📅

Julian Day Converter

Convert a Gregorian date into a Julian Day Number (astronomy standard).

⚙️

YAML ↔ TOML Converter

Convert between YAML and TOML via intermediate JSON.

📊

CSV ↔ TSV Converter

Convert between CSV and TSV preserving quoted fields.

📋

CSV → YAML Converter

Convert CSV (with header) into a YAML list of objects.

🧾

CSV → HTML Table

Generate HTML table (thead/tbody) from CSV with header.

🗄️

CSV → SQL INSERT

Generate SQL INSERT statements from CSV with header (single-quote escaping).

📑

CSV → XML

Convert CSV (with header) into XML — header columns become tag names.

9️⃣

Base91 Converter

Encode and decode Base91 — a more compact text encoding (~23% smaller than Base64).

8️⃣

Base85 (ASCII85) Converter

Encode and decode Base85/ASCII85 used in PDF and PostScript.

🔁

ROT18 Converter (ROT13 + ROT5)

Apply ROT13 to letters and ROT5 to digits. Symmetric — apply twice to recover.

⚛️

SVG → JSX Converter

Convert SVG to JSX, normalizing kebab-case attributes to camelCase.

💬

HTML → BBCode Converter

Convert basic HTML tags into BBCode for forum posts.

🔬

Engineering Notation Converter

Convert a decimal number to engineering notation (exponents in multiples of 3) — used in electronics, physics and engineering. Also shows scientific notation.

🧮

Scientific Notation Converter

Convert between decimal and scientific notation (mantissa × 10^exponent). Accepts both input formats and shows both results.

📊

Markdown ⇄ CSV Table Converter

Convert Markdown tables (| col1 | col2 |) to CSV and back. Auto-detects header and separators.

📋

CSV → JSON Lines (NDJSON) Converter

Convert CSV to NDJSON / JSON Lines — each row is a standalone JSON object. Heavily used in logs, big data and streams.

🧾

JSON Array ⇄ JSON Lines Converter

Convert a JSON array into JSON Lines (NDJSON) — one line per object, no commas or brackets. For piping with jq, Spark and Splunk.

🎨

CSS Color Name Converter

Convert CSS color names (red, dodgerblue, rebeccapurple) into HEX, RGB and HSL values. 147 official named colors.

🌧️

Rainfall (mm ⇄ L/m²) Converter

Convert rainfall between millimeters (mm) and liters per square meter (L/m²) — equivalent (1 mm = 1 L/m²) and total volume for an area.

📐

Degree / Radian / Gon Converter

Convert angles between degrees (°), radians (rad) and gons (1/400 of a full turn). For surveying, navigation and science.

🚗

mph ⇄ km/h Converter

Convert speed between mph, km/h, m/s and knots.

⛵

Knots Nautical Converter

Convert knots to km/h, m/s, mph. For maritime navigation and aviation.

🏎️

Speed Multi-unit Converter

Convert speed across m/s, km/h, mph, knots and Mach.

📏

Length Multi-unit Converter

Convert length across mm, cm, m, km, in, ft, yd, mile and nautical mile.

⚖️

Mass Multi-unit Converter

Convert mass across mg, g, kg, t, oz, lb and stone.

🥤

Volume Multi-unit Converter

Convert volume across mL, L, m³, fl oz, cup, pint, quart, gallon.

🏞️

Area Multi-unit Converter

Convert area across cm², m², km², hectare, acre, ft², mile².

⏰

Time Multi-unit Converter

Convert time across ms, s, min, h, day, week, month (30d) and year (365.25d).

💡

Illuminance Converter (lux/footcandle)

Convert illuminance between lux and foot-candle.

🚰

Flow Rate Converter

Convert volumetric flow rate across L/s, L/min, m³/h, gpm.

🔧

Torque Converter

Convert torque across N·m, kgf·m and ft·lb.

⚗️

Density Converter

Convert density across g/cm³, kg/m³, lb/ft³ and lb/in³.

🌅

Color from Temperature (Kelvin → RGB)

Approximate RGB color of a black body at given Kelvin temperature.

🎨

CSS Named Color ↔ Hex

Convert CSS named colors to hex and find nearest name for any hex.

½

Fraction ↔ Decimal Converter

Convert a fraction to decimal and decimal to reduced fraction.

₿

BTC ↔ Satoshis Converter

Convert between BTC and satoshis. 1 BTC = 100,000,000 sats.

🎨

Pantone (approx.) ↔ Hex

Approximate Pantone Solid Coated → hex lookup (not a physical match substitute).

🗺️

Lat/Lng → UTM Converter

Convert decimal lat/lng to UTM zone/easting/northing using WGS84.

📍

Lat/Lng → MGRS (approx)

Approximate MGRS conversion using UTM zone + latitude band + easting/northing.

🖨️

CMYK ↔ RGB Converter

Convert colors between CMYK and RGB.

🎭

Lab ↔ RGB Converter

Convert between CIE Lab (D65) and sRGB.

🌈

HSV ↔ RGB Converter

Convert between HSV and RGB.

🎼

BPM → ms (delay/reverb)

Convert BPM to note durations in ms (whole/half/quarter/eighth/sixteenth).

🎹

Piano Key → Frequency

Convert piano key number (1-88) to frequency in Hz with A4 = 440Hz reference.

👟

Shoe Size Converter

Equivalence table for shoe sizes BR/EU/US (M/W)/UK.

👕

Clothing Size Converter

BR PP-GG, EU 36-50, US XS-XXL clothing size equivalence.

📄

Paper Size Converter

Show dimensions in mm and in for ISO A0-A10, B0-B5, US Letter/Legal/Tabloid/Executive.

📺

Resolution ↔ Aspect Ratio

Compute aspect ratio from W×H, and given a height, compute width.

💻

Bytes ↔ Bits Converter

Convert between bits/bytes/kbps/Mbps/KB/MB/GB.

📐

Bytes IEC vs SI Converter (KiB vs KB)

Compare IEC binary prefixes (KiB=1024) vs SI decimal prefixes (KB=1000).

☪️

Gregorian → Hijri Date

Convert Gregorian to Hijri (Islamic) date using arithmetic algorithm.

✡️

Gregorian → Hebrew Date

Convert Gregorian to Hebrew date (simplified Reingold-Dershowitz).

🌡️

Temperature Converter (Rankine)

Convert temperatures across Celsius, Fahrenheit, Kelvin and Rankine.

🚀

Acceleration Converter

Convert acceleration across m/s², ft/s², g (9.80665) and Gal (1 cm/s²).

🧲

Magnetic Field Converter (Tesla ↔ Gauss)

Convert magnetic field across Tesla, Gauss and milligauss.

☢️

Radiation Dose Converter

Convert ionizing radiation dose across Sv, mSv, Rem, Gray.

🥄

Cooking Volume Converter

Convert cooking volumes: cup (240ml), tbsp (15ml), tsp (5ml), mL, L.

🔤

Emoji ↔ Codepoint

Convert emoji to Unicode codepoint (U+1F600) and back. Supports ZWJ sequences.

🚩

ISO Code → Flag (Emoji)

Convert ISO 3166-1 alpha-2 codes (BR, US, FR) to regional flag emojis.

🔢

Decimal ↔ Binary (BigInt)

Convert between decimal and binary with BigInt support for very large numbers.

🔁

Hex ↔ Decimal (BigInt)

Convert hex ↔ decimal with BigInt for long hashes/addresses.

📐

CSS vh ↔ px

Convert CSS vh (% of viewport height) ↔ px given viewport height.

↔️

CSS vw ↔ px

Convert CSS vw (% of viewport width) ↔ px given viewport width.

🅰️

CSS em ↔ px

Convert CSS em ↔ px given base font size (default 16px).

📝

CSS pt ↔ px

Convert pt ↔ px (1pt = 1.3333px @ 96dpi). Useful for PDF→web.

🌈

HSL ↔ RGB Converter

Convert between HSL and RGB color spaces.

🇨🇳

China Clothing Size Converter

China clothing size labels (e.g., 160/84A) ↔ BR and EU equivalents.

🔢

Base16 (Hex) ↔ ASCII

Convert ASCII text to/from Base16 (hex). Useful for inspecting binary as string.

🏦

IBAN ↔ BBAN

Extract BBAN from IBAN or build IBAN from country + BBAN with mod-97 check digits.

🔋

Battery mAh ↔ Wh

Convert battery capacity between mAh and Wh given voltage. Useful for airline limits.

⚡

Watts ↔ Amperes

Convert between Watts and Amperes given voltage (W = V × A in DC).

🐎

CV ↔ HP ↔ kW

Convert mechanical power between metric CV, mechanical HP and kW.

🛢️

Oil Barrel ↔ Gallon ↔ Liter

Convert oil volume across barrel (159 L), US gallon (3.785 L), UK gallon (4.546 L), liters.

🔁

Resistance ↔ Conductance

Convert between resistance (Ω) and conductance (S = 1/Ω).

🌡️

Celsius ↔ Newton

Convert between Celsius and Newton temperature scale (°N = °C × 33/100).

🌡️

Celsius ↔ Réaumur

Convert between Celsius and Réaumur (°Ré = °C × 4/5).

🌡️

Celsius ↔ Rømer

Convert between Celsius and Rømer (°Rø = °C × 21/40 + 7.5).

⏱️

Decimal Hours ↔ HH:MM:SS

Convert decimal hours ↔ HH:MM:SS for timesheets.

🥇

Troy Ounce ↔ Gram

Convert mass between troy ounce (ozt) and grams. 1 ozt = 31.1034768 g.

🔌

AWG ↔ mm²

Convert wire gauge between AWG and mm².

🔁

Binary ↔ Gray Code

Convert between binary and Gray code (adjacent values differ by 1 bit).

🚴

RPM ↔ Linear Speed

Convert RPM to linear speed (km/h or m/s) given wheel diameter.

📶

Bluetooth Classes (Power)

Show Bluetooth class power and typical range.

Ξ

Ether / Gwei / Wei Converter

Convert Ethereum values across ether, gwei (10⁻⁹), wei (10⁻¹⁸).

🎼

Spotify Key ↔ Camelot

Convert Spotify pitch class (0-11) + mode (0/1) to Camelot Wheel notation.

🎨

CMYK → Pantone (approx)

Estimate closest Pantone Solid Coated for a given CMYK color (~20 popular).

🔤

Font Size Table (px/rem/em/pt)

Show font size equivalence table (px/rem/em/pt) at base 16px.

🎵

Frequency ↔ Musical Note

Convert frequency to closest musical note + octave (A4 = 440Hz reference).

🖖

Star Trek Stardate ↔ Date

Convert Gregorian date ↔ Star Trek TNG stardate (simplified, 1 year = 1000 units from 2323).

🌀

Discordian Date Converter

Convert Gregorian date to Discordian/Erisian calendar (5 seasons of 73 days).

🇫🇷

French Republican Calendar

Convert Gregorian to French Republican calendar (12×30 days + 5/6 sans-culottides).

🌅

Mayan Long Count Calendar

Convert Gregorian date to Mayan Long Count using GMT correlation 584283.

🌐

Decimal → DMS

Convert decimal coordinates to degree-minute-second (DMS) for maps/GPS.

🌐

DMS → Decimal

Convert DMS coordinates to decimal. Accepts N/S/E/W indicators.

🎨

CSS RGBA Converter

Convert color across rgba(), hex8 and named with alpha. Shows transparent preview.

🎨

Batch RGB → Hex

Convert multiple "R,G,B" lines to hex values. Useful for CSS color lists.

🦸

Marvel/DC Character ID Converter

Simple lookup of Marvel/DC character names to short codes (e.g. Spider-Man → SPDM).

🧬

DNA ⇄ RNA Converter

Convert DNA sequences (A, C, G, T) to RNA (A, C, G, U) and back. Supports complementary and reverse strands.

🧬

RNA to Amino Acid (Codon) Converter

Translate mRNA into amino acid sequence using the standard genetic code. Shows codons and one-letter codes.

0️⃣

Binary ⇄ ASCII Converter

Convert ASCII text to binary (8 bits per char) and back. Bytes space-separated for readability.

🔢

Number ⇄ Emoji Number Converter

Convert digit strings to emoji digits (0️⃣1️⃣...) and back. For visual passwords or fun codes.

🔵

Number to Circle (Unicode) Converter

Convert numbers to circled Unicode forms: ① ② ③ (1-50), ❶ ❷ ❸, etc. For stylized lists.

🌡️

Fahrenheit ⇄ Rankine Converter

Convert between Fahrenheit (°F) and Rankine (°R) — Rankine is Kelvin scaled to Fahrenheit, with absolute zero at 0°R.

🎈

Pascal ⇄ Bar ⇄ atm ⇄ psi Converter

Convert between pressure units: Pascal (Pa), bar, atmosphere (atm), psi and Torr/mmHg. For engineering and meteorology.

📋

CSV → TOML Converter

Convert CSV (with header) to TOML — one [[rows]] section per row. For structured configs in Rust, Cargo and modern tools.

🔁

TOML ⇄ YAML Converter

Convert TOML to YAML and back (common subset). For migrating configs between tools.

📊

CSV → ARFF (Weka) Converter

Convert CSV to ARFF (Attribute-Relation File Format), used by Weka and data mining tools. Auto-detects numeric types.

🔄

GraphQL Schema → TypeScript Converter

Convert a GraphQL schema (SDL) into TypeScript interfaces. Covers type, enum and input — not resolvers or complex unions.

🔄

Protobuf → JSON Schema Converter

Convert simple protobuf messages to JSON Schema (draft-07). Covers basic types, optional, repeated and enums.

📊

CSV to Excel/Sheets Clipboard Converter

Convert CSV to a TAB-separated paste-ready format for Excel/Google Sheets. Preserves multiline cells and quotes.

🔐

MD5 (hex) → Base64 Converter

Convert an MD5 hex hash (32 chars) to base64 (24 chars). For Content-MD5 HTTP header (RFC 1864) and Subresource Integrity.

🔄

UUID ⇄ Bytes Converter

Convert UUID between canonical (xxxx-xxxx-...) and byte array (16 octets in hex/decimal). For binary protocols.

🔢

Fractional Binary ⇄ Decimal Converter

Convert binary with fractional part (e.g., 101.011) to decimal and back. For computer arithmetic fundamentals.

Ⅻ

Roman ⇄ Decimal Converter (advanced)

Convert Roman numerals (I, IV, XL, MCMXCIV) to decimal and back. Supports 1-3999 with canonical-form validation.

🌐

MAC Address Format Converter

Convert MAC addresses between formats: AA:BB:CC:DD:EE:FF (Unix), AA-BB-CC-DD-EE-FF (Windows), AABB.CCDD.EEFF (Cisco), and no-separator.

🌐

IPv4 ⇄ Binary Converter

Convert IPv4 (192.168.1.1) to binary (32 bits) and back. For understanding subnet masks.

Ω

Greek ⇄ Roman Numeral Converter

Convert ancient Greek numerals (αʹ, βʹ, γʹ — Ionic system) to Roman and back, for 1-999. Classical curiosity.

🎨

Pantone → Hex Converter (approximate)

Convert common Pantone Solid Coated codes (185 C, 286 C, etc.) to approximate HEX. 30 frequent colors only — not a substitute for official guides.

🎨

RAL → Hex Converter (Classic)

Convert RAL Classic codes (RAL 1000, RAL 5010, etc.) to HEX. Used in industrial paint and European architecture. ~100 colors.

🎨

NCS → Hex Converter (approximate)

Convert Natural Color System codes (S 1080-Y10R) to approximate HEX. 25 common colors based on official research.

🩸

Blood Type Compatibility Converter

Show which blood types can donate to and receive from a specific type (A+, B-, O+, AB-, etc.). Covers Rh.

🩸

Blood Group ABO + Rh Decomposer

Decompose a blood type (A+, B-, AB+, O-) into ABO group and Rh factor. Shows antigens/antibodies in plasma.

🎨

HSV ⇄ HSL Color Converter

Convert between HSV (Hue, Saturation, Value) and HSL (Hue, Saturation, Lightness) color models. For design and color tweaks.

🎨

CIE Lab ⇄ Hex Color Converter

Convert between CIE L*a*b* (perceptually uniform) and HEX. Uses D65 illuminant standard. Lab → XYZ → sRGB.

🖨️

RGB → CMYK Converter (PDF mode)

Convert RGB to CMYK using a simple profile suitable for PDF/print. Shows each component in % and visual color.

👕

Clothing Size Converter

Convert clothing sizes between BR, US, EU, UK, JP — women and men, shirts, pants, dresses. Approximation tables.

👟

Shoe Size Converter

Convert shoe sizes between BR, US, UK, EU, JP. Men and women. Tables based on foot length in cm.

💍

Ring Size Converter

Convert ring sizes between BR, US, UK, EU, JP. Use inner diameter or circumference in mm. Standard tables.

🔊

Decibel ⇄ Watt (Power) Converter

Convert between power in watts (W) and level in decibels (dBW, dBm). For pro audio, RF, telecoms.

⚙️

Watt ⇄ CV ⇄ HP Converter

Convert power between watt (W), metric horsepower (CV) and mechanical horsepower (HP). For engines and machines.

⌛

Natural Relative Time Converter

Convert a date to natural relative text ("5 min ago", "yesterday", "in 3 days"). For feeds, comments, notifications.

🏯

Area to Tatami (Jō) Converter

Convert area in square meters to Japanese tatami (jō ≈ 1.65 m²). Used in traditional Japanese architecture for rooms.

🌾

Acre Area Converter

Convert between acres (US/UK), m², hectares, alqueires (BR), tareas (UY). Covers multiple agricultural/real estate units.

📏

Hectare ⇄ Areas Converter

Convert hectares to other area units: m², km², acres, mi², soccer fields, tareas. For AGtech and GIS.

🪐

Earth ⇄ Mars Time (Sols) Converter

Convert Earth seconds to Mars seconds (sols). 1 sol = 24h 39min 35s. For space missions and sci-fi.

📜

Julian ⇄ Gregorian Calendar Converter

Convert a date from Julian calendar (pre-1582) to Gregorian and back. For historical and religious dates.

⏰

Brazil Timezone Converter

Convert time between Brazil 4 timezones: UTC-2 (Atlantic), UTC-3 (official Brasília), UTC-4 (west), UTC-5 (Acre). Shows all 4 simultaneously.

📊

Position ⇄ Array Index Converter

Convert between human position (1-based) and array index (0-based). Includes 2D matrix (row,col) ⇄ linear index.

🔢

Mixed Base Converter (any 2-36)

Convert a number from any base (2-36) to any other base. Also supports simple fractional numbers.

🎨

RGB → YUV (Luma + Chroma) Converter

Convert RGB to YUV (Y luminance, U/V chrominance) using ITU-R BT.601. Used in video compression (MPEG, H.264).

📺

RGB → YIQ Converter

Convert RGB to YIQ (US NTSC TV). Y is luminance, I is hue, Q is saturation. For legacy TV compat.

🎨

RGB → XYZ Converter (CIE 1931)

Convert sRGB to CIE 1931 XYZ using D65 standard matrix. Foundation for Lab, Luv and other space conversions.

🌡️

Color Temperature (Kelvin → RGB)

Convert color temperature in Kelvin (1000K-12000K) to approximate RGB. For light tones: candle (1900K), sun (5800K), blue sky (10000K).

☀️

Light-minute Distance Converter

Convert light-minute distances (8.3 min to Sun, 4.2 light-years to Proxima Centauri) to other astronomical and SI units.

🍷

Wine Bottle Sizes Converter

Convert ml to traditional wine bottle sizes: split, half, standard, magnum, jeroboam, nebuchadnezzar.

🍺

Beer Volume Converter

Convert beer volumes between ml, longneck (355ml), 600ml bottle, can (350ml), barrel (50L), keg (30L).

☕

Coffee Volume Converter

Convert coffee portions between ml, cup (50ml), spoon (10ml), espresso (30ml), cappuccino (150ml).

🫖

Imperial Volume Converter (oz, pint)

Convert between ml and British/US imperial measurements: fluid ounce, pint, quart, gallon. Covers US-UK differences.

🥣

US Cup → Grams (by ingredient)

Convert US cup (240ml) to grams depending on ingredient: flour (120g), sugar (200g), butter (227g), rice (180g).

🥄

Tablespoon (Tbsp) Converter

Convert between Tbsp, tsp, ml and grams (for common ingredients). 1 Tbsp = 3 tsp = 15 ml.

🌡️

Oven Temperature Converter

Convert recipe temperatures between °C and °F, with common terms: low, medium, high, broil. With UK gas mark.

🖥️

Screen Size Converter (in ⇄ cm)

Convert screen diagonal size between inches and cm. Computes width/height for 16:9, 16:10, 4:3, 21:9 ratios.

📐

Pixel ⇄ cm (DPI) Converter

Convert pixels to cm and mm given a specific DPI. For print (300 DPI) and screen (96 DPI). Shows reverse too.

🖼️

Image Resolution (DPI) Converter

Compute max print size of an image in DPI: given pixels (W/H) and target DPI (75/150/300), show printed size in cm.

📡

bps ⇄ packets/s Converter

Convert bit rate (bps) to packets/s given a packet size (bytes). For network traffic analysis.

🔄

JSX to HTML Converter

Converts JSX (React) syntax to plain HTML by mapping className to class and camelCase attributes to kebab-case.

🔄

HTML to JSX Converter

Converts HTML to JSX by renaming class to className, for to htmlFor and switching attributes to camelCase.

🔄

Pug to HTML Converter

Explains how to translate indentation-based Pug templates into standard HTML with side-by-side examples.

🔄

HTML to Pug Converter

Shows how to translate HTML into indentation-based Pug syntax with attribute and nesting examples.

🔄

HAML to HTML Converter

Explains HAML (Ruby template) syntax against HTML output with examples for tags, attributes and blocks.

🔄

HTML to HAML Converter

Shows how to translate HTML into HAML with indentation rules, attribute hashes and shorthand class/id syntax.

🔄

SCSS to CSS Converter

Strips simple SCSS features (variable declarations and // comments) producing an approximate CSS for inspection.

🔄

CSS to SCSS Converter

Adapts CSS to SCSS preserving rules and turning CSS custom properties into SCSS variables when detected.

🔄

SASS to CSS Converter

Explains the differences between indented SASS (.sass) syntax and CSS with side-by-side examples.

🔄

CSS to SASS Converter

Shows how to translate plain CSS to indented SASS by removing braces and semicolons.

🔄

LESS to CSS Converter

Strips LESS @variables and // comments producing approximate CSS suitable for visual checking.

🔄

CSS to LESS Converter

Converts CSS custom properties (--var) to LESS @variables while keeping the rest of the file intact.

🔄

Stylus to CSS Converter

Explains converting Stylus templates (optional braces/colons) into standard CSS with examples.

🔄

CSS to Stylus Converter

Shows how to drop braces and semicolons from CSS to produce concise Stylus code.

🔄

Jade to HTML Converter

Jade is the legacy name for Pug. This page shows how its indented syntax maps to HTML tags and attributes.

🔄

Twig to HTML Converter

Shows how Twig (Symfony) uses {{ }} for output and {% %} for blocks, paired with the rendered HTML.

🔄

Vue Template to HTML Converter

Explains how Vue directives (v-if, v-for, :prop) become plain HTML after the component renders.

🔄

Svelte Template to HTML Converter

Shows how Svelte blocks ({#if}, {#each}) and { } expressions compile down to plain HTML.

🔄

Angular Template to HTML Converter

Explains Angular directives (*ngIf, *ngFor, [attr], (event)) and how they produce rendered HTML.

🔄

Blade to HTML Converter

Shows how Blade (Laravel) directives map to the HTML produced after PHP rendering.

🔄

Mustache to HTML Converter

Shows how Mustache tags ({{var}}, {{#block}}) turn into HTML after substitution with data.

🔄

Handlebars to HTML Converter

Handlebars extends Mustache with helpers. This page shows how {{#each}} and {{#if}} render into HTML.

🔄

EJS to HTML Converter

Shows how EJS tags (<%= %>, <% %>) embed JavaScript inside the template and produce final HTML.

🔄

Liquid to HTML Converter

Liquid (Shopify/Jekyll) uses {{ var }} and {% tag %}. This page maps each construct to its rendered HTML.

🔄

ERB to HTML Converter

ERB (Ruby) embeds Ruby inside HTML via <% %> and <%= %>. This page shows rendered output examples.

🔄

Jinja to HTML Converter

Jinja2 (Python/Flask) uses {{ }} and {% %} like Twig. This page shows how blocks become rendered HTML.

🔄

Nunjucks to HTML Converter

Nunjucks (Mozilla) has a Jinja2-like syntax. This page shows how tags and filters yield HTML.

🔄

JSONP to JSON Converter

Strips the callback wrapper of a JSONP response leaving only the JSON contained inside the parentheses.

🔄

BSON to JSON (text) Converter

Explains differences between binary BSON and JSON with a type table and textual conversion examples.

🔄

CBOR to JSON (text) Converter

Explains CBOR (RFC 8949), its types and how to represent compact binary values in textual JSON.

🔄

MessagePack to JSON (text) Converter

Explains the MessagePack binary format, its advantages and how to translate it into textual JSON.

🔄

Avro to JSON (text) Converter

Explains Avro schemas, its binary serialization and how JSON can represent decoded Avro records.

🔄

TSV to CSV Converter

Converts TSV files (tab-separated) into CSV (comma-separated) properly escaping fields with commas or quotes.

🔄

CSV to NDJSON Converter

Converts CSV into NDJSON (one JSON object per line) using the first row as field names.

🔄

YAML to NDJSON Converter

Explains how to represent YAML lists as NDJSON (one JSON object per line) with practical examples.

🥄

Xícara → Gramas (Açúcar)

Converte xícara de açúcar refinado em gramas (1 xícara = 200 g).

🌾

Xícara → Gramas (Farinha)

Converte xícara de farinha de trigo em gramas (1 xícara = 120 g).

🍚

Xícara → Gramas (Arroz)

Converte xícara de arroz cru em gramas (1 xícara = 185 g).

🔥

Forno Gás 1-9 → °C

Converte temperatura de forno a gás (escala 1-9) para graus Celsius.

🎵

BPM → Delay (ms)

Converte BPM em delays musicais para 1/4, 1/8 e 1/16 (ms).

🎹

MIDI → Nota Musical

Converte número MIDI (0-127) em nota musical com oitava (ex: 60 = C4).

🎼

Nota Musical → MIDI

Converte nota musical (ex: A4) em número MIDI.

🎚️

Diferença em Cents

Calcula a diferença em cents entre duas frequências: 1200·log₂(f₂/f₁).

🔄

BPM ↔ RPM

Converte BPM para RPM (rotações de toca-disco): RPM = BPM × 60 / 60 (igual numericamente quando 1:1).

🌡️

Temperatura da Cor (Warm/Cool)

Classifica uma cor HEX como quente, fria ou neutra com base na matiz.

🔬

RGB ↔ CIELAB (aprox)

Converte cor RGB para CIELAB aproximado via XYZ D65.

🔤

Base45 (EU Cert)

Codifica string em Base45 (usado em certificados digitais EU).

🪙

Base58 (Bitcoin)

Codifica bytes em Base58 (alfabeto Bitcoin, sem 0OIl).

🔗

Base62 (Short URLs)

Codifica número decimal em Base62 (0-9, A-Z, a-z) — usado em short URLs.

📜

Ascii85 (Adobe)

Codifica bytes em Ascii85 com delimitadores <~ ~>.

📡

Z85 (ZeroMQ)

Codifica bytes em Z85 (alfabeto ZeroMQ, sem caracteres problemáticos).

🔤

Base91 Encode

Codifica string em Base91 (mais denso que Base64).

✉️

Quoted-Printable

Codifica string em Quoted-Printable (RFC 2045).

🌐

Punycode IDN

Converte domínio internacional (IDN) entre Unicode e Punycode usando URL nativa.

🔄

JSON → YAML

Converte JSON em YAML simples (sem libs).

🔁

YAML → JSON (simples)

Converte YAML simples (key: value, listas) em JSON.

📝

JSON → TOML

Converte JSON simples em TOML básico (chaves de nível raiz).

📊

JSON → Markdown Table

Converte array de objetos JSON em tabela Markdown.

🗄️

JSON → HTML Table

Converte array de objetos JSON em tabela HTML.

🍺

Pinta → Litros

Converte pintas britânicas em litros (1 pint UK = 0.568 L).

📏

Jardas → Metros

Converte jardas em metros (1 yd = 0.9144 m).

🐎

CV → Watts

Converte cavalo-vapor (PS métrico) em watts (1 CV = 735.5 W).

⏲️

Bar → PSI

Converte bar em libras por polegada quadrada (1 bar = 14.5038 PSI).

🌌

km → Anos-luz

Converte km em anos-luz (1 al = 9.461×10¹² km).

⛽

Consumo L/100km → MPG

Converte consumo de litros por 100 km para milhas por galão (US): 235.215 / L100.

⛽

Consumo MPG → L/100km

Converte milhas por galão (US) para litros por 100 km: 235.215 / MPG.

🚗

Consumo km/L → L/100km

Converte quilômetros por litro para litros por 100 km: 100 / kmL.

💨

Pressão Pneu PSI ↔ BAR

Converte pressão de pneu entre PSI e BAR (1 BAR = 14.5038 PSI).

🔧

Cilindrada cc ↔ L

Converte cilindrada entre centímetros cúbicos e litros (1 L = 1000 cc).

🔧

Cilindrada cc ↔ ci

Converte cilindrada entre cc (centímetros cúbicos) e ci (cubic inches): 1 ci = 16.3871 cc.

🔩

Torque Nm ↔ lb·ft

Converte torque entre Nm e lb·ft (1 lb·ft = 1.3558 Nm).

🐎

HP ↔ kW (motor)

Converte potência entre HP (mecânico) e kW: 1 HP = 0.7457 kW.

💱

Conversor Moedas (Taxa Fixa)

Converte entre USD/EUR/BRL/GBP/JPY/CAD/AUD/CHF usando taxas fixas (referência: 2025).

📐

Crop Factor por Sensor

Retorna crop factor relativo ao Full Frame: APS-C=1.5/1.6, MFT=2.0, 1"=2.7, Médio=0.79.

🔅

Luxímetro Lux → EV

Converte iluminância (lux) para EV @ ISO 100: EV = log2(lux/2.5).

🔍

Focal Equivalente 35 mm

Converte focal real para equivalente 35 mm: focal × crop factor.

📏

Agulha Tricô US ↔ mm ↔ UK

Converte tamanho de agulha de tricô entre US, mm e UK (tabela padrão).

📐

Margem de Costura cm ↔ pol

Converte margem de costura entre cm e polegadas (1 pol = 2.54 cm).

🎵

Andamento Italiano → BPM

Converte marcações italianas (Adagio, Andante, Allegro...) para BPM aproximado.

🔀

Converter CPM ↔ CPC ↔ CPL

Calcula CPC e CPL a partir de CPM, CTR e taxa de conversão. CPC = CPM/(CTR·10); CPL = CPC/conversão.

🔁

Converter MRR → ARR

Converte receita recorrente mensal em anual: MRR × 12. Útil para SaaS.

🏃

Pace por km a partir de km/h

Converte velocidade média (km/h) em ritmo (min/km).

🩸

Glicose Média → HbA1c (eAG)

Converte glicose média estimada (mg/dL) em HbA1c: A1C = (eAG + 46.7) / 28.7.

🌐

Conversor Códigos ISO País

Converte entre ISO-2, ISO-3 e código numérico para país.

🧪

ppm ↔ Molaridade

M = (ppm × densidade(g/mL)) / (MM × 1000). Diluído: densidade≈1.

🧬

Códon → Aminoácido

Traduz um códon de RNA (ex: AUG) em aminoácido.

🧬

Transcrição DNA → RNA

Substitui T por U na fita molde (sentido transcrito).

🧬

Fita complementar DNA

Gera fita complementar (A↔T, G↔C), mesma direção.

🧬

Reverso complementar DNA

Calcula o reverso complementar (5'→3').

🎨

Resistor 4 bandas → Ω

Decodifica resistor 4 bandas: 2 dígitos + multiplicador + tolerância.

🎨

Resistor 5 bandas → Ω

Decodifica resistor 5 bandas: 3 dígitos + multiplicador + tolerância.

🌈

Ohms → Cores Resistor

Converte um valor em Ω para cores 4-bandas.

🌊

AC pico ↔ RMS

Vrms = Vpeak / √2.

🌊

AC pico-a-pico ↔ RMS

Vrms = Vpp / (2√2).

🔊

dBSPL → Pa

Pa = 20µPa · 10^(dBSPL/20).

🎤

dBu → Volt RMS

V = 0.7746 · 10^(dBu/20).

🎚️

dBV → Volt RMS

V = 1 · 10^(dBV/20).

🎵

Hz → Bark (banda crítica)

Bark = 13·arctan(0.00076·f) + 3.5·arctan((f/7500)²).

🔉

Phon → Sone (loudness)

Sone = 2^((phon-40)/10) para phon ≥ 40.

🛢️

Tinta Galão para Litro com Custo

Converte galão (3,785 L) para litros e calcula custo por m².

🌧️

Pluviômetro mm → Litros

Converte chuva em mm para litros captados em área: 1 mm × 1 m² = 1 L.

🐶

Idade do Cão em Anos Humanos

Converte idade canina em anos humanos via fórmula AVMA: 16·ln(idade)+31.

🐈

Idade do Gato em Anos Humanos

Converte idade felina: 1º ano = 15h, 2º = +9h, depois +4h por ano.

🎓

GPA US 4.0 a partir de Notas

Converte média 0-100 para GPA 4.0 (90+=4.0, 80=3.0, 70=2.0, 60=1.0).

🇬🇧

GPA UK: Classificação

Classifica nota UK: 1st (≥70), 2:1 (60-69), 2:2 (50-59), 3rd (40-49), Fail (<40).

📐

SAT 1600: Percentil

Estima percentil pelo SAT total (lookup aproximado: 1600=99+, 1500=98, 1400=94, 1200=75, 1000=40).

🌐

TOEFL: Banda iBT

Classifica banda CEFR a partir do TOEFL iBT (0-120).

🇬🇧

IELTS: Conversão de Banda

Converte banda IELTS em CEFR aproximado.

🪙

Satoshis ↔ BTC

Converte entre satoshis (menor unidade) e BTC. 1 BTC = 100 milhões de satoshis.

⛽

Gwei ↔ ETH

Converte entre gwei e ETH. 1 ETH = 1 bilhão de gwei (10⁹). Útil para taxas de gas.

🔢

Gwei ↔ Wei

Converte entre gwei e wei. 1 gwei = 10⁹ wei (menor unidade do ETH).

💵

BTC ↔ USD (taxa fixa)

Converte BTC para USD usando taxa fixa informada. Apenas exibição — não consulta cotação em tempo real.

💵

ETH ↔ USD (taxa fixa)

Converte ETH para USD usando taxa fixa informada. Apenas exibição — não consulta cotação em tempo real.

🎭

CIDR para Wildcard Mask

Converte máscara CIDR (/n) para wildcard mask (usada em ACLs Cisco).

📏

Parsec ↔ Anos-Luz

Converte entre parsec e anos-luz. 1 pc = 3,26156 anos-luz.

🧫

Fermento Fresco → Seco

Converte fermento biológico fresco em seco (×0.33) ou vice-versa.

🧪

Fermento Ativo → Instantâneo

Converte fermento seco ativo em instantâneo (×0.75) ou contrário.

🎂

Substituição de Forma de Bolo

Compara volumes de formas redondas/retangulares para substituição (πr²h vs L×W×h).

🧈

Manteiga ↔ Óleo

Converte manteiga em óleo (óleo = 75% da manteiga) ou contrário em receitas.

🥚

Substituto de Ovo

Mostra equivalentes de 1 ovo em receitas veganas (linhaça, maçã, banana, aquafaba).

⚡

Elétron-volt ↔ Joule

Converte eV em joule (1 eV = 1.602×10⁻¹⁹ J) e vice-versa.

🔁

VAT — Inclusivo ↔ Exclusivo

Converte valor entre VAT-inclusivo (bruto) e VAT-exclusivo (líquido) para qualquer alíquota.

🌬️

CSS to Tailwind Converter

Map common CSS properties to equivalent Tailwind utility classes (display, padding, margin, color, font-size, border, etc).

😀

Emoji HTML Code Generator

Show decimal and hexadecimal HTML entities for emojis (&#128512; / &#x1F600;). Useful for emails or raw HTML.

🔣

Emoji to Unicode

Convert emoji to Unicode code point (U+1F600), JavaScript escape (\u{1F600}) and UTF-8 bytes.

🔀

Binary ↔ Hexadecimal Converter

Convert numbers between binary and hexadecimal without going through decimal. Shows nibble (4-bit) grouping.

8️⃣

Octal ↔ Decimal Converter

Convert between base 8 (octal) and base 10 (decimal). Useful for Unix file permissions and DSP.

🔢

BCD ↔ Decimal Converter

Convert between Binary-Coded Decimal (each decimal digit becomes 4 bits) and standard decimal. Common in digital displays and calculators.

🎚️

Gray Code ↔ Binary Converter

Convert between standard binary and Gray code (only 1 bit changes between consecutive numbers). Used in rotary encoders.

⏱️

Seconds to HH:MM:SS

Convert a number of seconds (integer or decimal) to HH:MM:SS.mmm format. Useful for video, audio and time tracking.

🕐

Decimal Hours ↔ HH:MM

Convert decimal hours (1.75) to HH:MM (01:45) and vice versa. Useful for time sheets and hourly billing.

📐

Degrees ↔ Radians (with table)

Convert angles between degrees and radians. Includes a table of common values (0, 30, 45, 60, 90, 180, 270, 360).

🧭

Degrees ↔ Gradians ↔ π rad

Convert between degrees (360°), gradians (400 gon) and radians as multiples of π. Useful in surveying and sciences.

📏

CSS px ↔ rem Converter

Convert between pixels and rem with configurable root base (default 16px). Useful for accessible layouts.

📐

CSS px ↔ em Converter

Convert between pixels and em relative to the parent context font-size (default 16px). Different from rem (always :root).

📱

CSS vh ↔ vw Converter

Convert between vh, vw and pixels for a configurable viewport (default 1920×1080). Useful for responsive design.

📚

BibTeX → RIS Converter

Convert BibTeX references to RIS format, the standard used by EndNote, Mendeley and Zotero. Supports @article, @book, @inproceedings.

📖

BibTeX → EndNote (ENW)

Convert BibTeX to EndNote ENW format: %0, %A, %T, %J, %D, etc. Useful for reference managers.

📋

BibTeX → CSL-JSON

Convert BibTeX to CSL-JSON (Citation Style Language). Modern format used by Zotero, Pandoc and citation processors.

🆔

DOI → BibTeX Generator

Enter a DOI (e.g., 10.1145/3372297.3417223) and format as a template BibTeX key (no external calls). Useful as a starting point.

📑

DOI → APA Citation (manual)

Manually format an APA 7th edition citation with authors, year, title, journal and DOI. No external call.

📜

DOI → MLA Citation (manual)

Manually format an MLA 9th edition citation with author, title, journal, volume, issue, pages, year and DOI.

📕

ISBN → Book Citation (manual)

Format book citation in APA, MLA, Chicago and ABNT from manual fields: author, year, title, edition, publisher and ISBN.

🌐

CSV → HTML Table

Convert CSV into a semantic HTML table with <thead> and <tbody>, escaping special characters. Optional custom CSS class.

➕

CSV ↔ PSV Converter

Convert CSV (comma-separated) files to PSV (pipe-separated |) and vice versa, with quote and newline handling.

〰️

CSV ↔ SSV Converter

Convert CSV (comma) to SSV (semicolon) and back. Useful for Excel in locales using ; as default separator.

📋

CSV → JSON Lines

Convert CSV to JSONL (one JSON object per line). Common format in logs, ML pipelines and document databases.

📄

JSON Lines → CSV

Convert JSONL (NDJSON) file to CSV, deriving headers from the union of all observed object keys.

🔁

CSV ↔ NDJSON

Two-way conversion between CSV and NDJSON (Newline Delimited JSON), preserving numeric types when detected.

📘

TSV → Markdown Table

Convert TSV (tab-separated) to a GFM Markdown table with configurable alignment (left, center, right).

🗒️

CSV → Org-mode Table

Convert CSV to an Emacs Org-mode table with | separators and default alignment. Easy to maintain in Emacs.

🔤

Markdown → AsciiDoc

Basic Markdown to AsciiDoc converter: headings (== ===), lists, inline code, code blocks --- and emphasis _italic_ *bold*.

📰

Markdown → reStructuredText

Basic Markdown to RST converter: underlined headings (=== ---), lists, links and inline code. Useful for Sphinx.

🗂️

Markdown → Org-mode

Basic Markdown to Org-mode converter: asterisk headings (* ** ***), lists, links and #+BEGIN_SRC code blocks.

🧵

Markdown → Textile

Basic Markdown to Textile converter: h1./h2./h3., *bold* _italic_, lists and links. Used in Redmine and old blog engines.

🔧

AsciiDoc → HTML (basic)

Render simple AsciiDoc to HTML: headings = == ===, paragraphs, lists, emphasis. Does not cover advanced extensions like includes.

🔨

reStructuredText → HTML (basic)

Render simple RST to HTML: underlined headings, lists, *italic*, **bold** and indented code blocks.

📂

Org-mode → HTML (basic)

Render simple Org-mode to HTML: asterisk headings, lists, /italic/, *bold* and #+BEGIN_SRC blocks.

🌡️

Rømer Temperature Converter

Convert between Rømer (°Rø) and Celsius/Fahrenheit/Kelvin. Scale created by Ole Rømer (1701): water freezes at 7.5 °Rø, boils at 60 °Rø.

🍎

Newton Temperature Converter

Convert between Newton (°N) and Celsius/Fahrenheit/Kelvin. Isaac Newton (1701): water freezes at 0 °N, boils at 33 °N.

🌡️

Réaumur Temperature Converter

Convert between Réaumur (°Ré) and Celsius/Fahrenheit/Kelvin. Created in 1731: water freezes at 0 °Ré, boils at 80 °Ré. Used in Europe until the 19th century.

📦

Bitrate to Size Converter

Calculate file size (MB/GB) from bitrate (kbps/Mbps) and duration (minutes). Useful for planning audio, video and podcast storage.

🎬

Video Size to Duration Converter

Calculate how many minutes fit in a size (MB/GB) given a specific bitrate. Inverse of bitrate→size conversion.

🔭

Parsec to KM

Converts distances between parsecs and kilometers (1 pc equals 3.085677581e13 km).

🌬️

Beaufort to km/h

Converts Beaufort wind scale (0-12) to equivalent speed in km/h.

🔁

YAML to TOML Converter

Converts flat YAML (key: value, inline lists) to TOML preserving strings, numbers and booleans.

🔂

TOML to YAML Converter

Converts flat TOML (key = value) to YAML preserving strings, numbers and booleans.

📄

INI to TOML Converter

Converts an INI file (with [section] headers and key=value) to TOML — close formats with minor adjustments.

📃

TOML to INI Converter

Converts simple TOML (with [section] and key = value) to INI — strips quotes from strings.

📑

YAML to INI Converter

Converts flat YAML to INI — no sections, each key becomes key=value.

🗂️

INI to YAML Converter

Converts an INI file to YAML — each section becomes a nested map.

📊

CSV to YAML List Converter

Converts CSV with header to a YAML list of objects — preserves basic numeric and boolean types.

📈

YAML List to CSV Converter

Converts a YAML list of objects (-key: value) to CSV with a header derived from the keys.

🧾

.properties to YAML Converter

Converts a Java .properties file (key=value, key.sub=value) to nested YAML by dot path.

🔖

YAML to .properties Converter

Converts nested YAML to a Java .properties file — keys are joined by dot.

🔉

Decibel to Percent Volume

Converts dB attenuation into percent volume (0–100) using 10^(dB/20) for faders and mixers.

⚡

dBW to Watts

Converts a dBW level to watts via P=10^(dBW/10) — useful for PA, RF and amplifiers.

📢

dB SPL to Pascals

Converts sound pressure level dB SPL to pascals via P=20µPa·10^(dB/20).

📈

Study Hours to CEFR Level Converter

Converts accumulated study hours into the reached CEFR level (A1 to C2) using average pace for Portuguese native learners.

📄

Pages to Translation Lauda Converter

Converts a number of pages into Brazilian sworn translation laudas (25 lines of 50 chars = 1250 chars) using an average chars per page.

🔠

Translation Laudas to Characters Converter

Converts a number of Brazilian sworn translation laudas (25 lines of 50 chars) to total characters with and without spaces for quotes.

🔤

Characters to Words Translation Converter

Converts total characters with spaces to an approximate word count (5.5 chars/word average) and to Brazilian sworn translation laudas.

🎤

Words to Aloud Reading Time Converter

Converts a word count to estimated aloud reading time (professional narrator, anchor or auctioneer) using calibrated WPM speeds.

🔑

BIP39 Mnemonic Entropy Converter

Computes bit entropy of a BIP39 seed from number of words (12, 15, 18, 21 or 24) with embedded checksum per spec.

💾

Z80 Opcode Hex Binary Converter

Converts Zilog Z80 hexadecimal opcode to formatted 8 bit binary with high and low nibble separated for retrocomputing study.

🕹️

MOS 6502 Opcode Converter

Converts MOS 6502 (NES, Apple II, C64) hexadecimal opcode to formatted 8 bit binary with approximate addressing mode.

🎮

Motorola 68000 Opcode Converter

Converts Motorola 68000 (Amiga, Atari ST, Sega Genesis) 16 bit opcode to formatted 4 nibble binary for retro code analysis.

🟦

PETSCII C64 ASCII Converter

Converts Commodore 64 PETSCII characters to equivalent ASCII codes when possible, flagging PETSCII only chars.

🌈

ZX Spectrum Charset Converter

Converts ZX Spectrum (Sinclair) charset codes to ASCII flagging BASIC tokens, graphic blocks and control codes that differ from standard.

🇬🇧

Amstrad CPC Mode Bytes Converter

Computes VRAM bytes per line and total for Amstrad CPC modes 0, 1 and 2 showing resolution and simultaneous colors per mode.

📟

BBC Micro Mode Resolution Converter

Shows resolution and simultaneous colors for each BBC Micro mode (0 to 7) with VRAM used per mode on the classic 8 bit Acorn.

🪐

Sega Saturn Color Mode Converter

Computes bytes per pixel and total VRAM used by a Sega Saturn background layer for 4 bit, 8 bit, 16 bit RGB555 and 24 bit color modes.

🎬

FPS Frames Seconds Converter

Converts duration in seconds to total number of frames given the frames per second rate selected for the video sequence.

🎞️

Film Feet Perforations Converter

Converts 35mm film duration to feet and perforations using sixteen perforations per foot industry standard and four perforations per frame.

⏱️

Frames Dropframe Timecode Converter

Converts total frames to SMPTE timecode in HH MM SS FF format applying drop frame rule for 29.97 frames per second.

🎨

OKLCH ↔ RGB Color Converter

Converts between OKLCH (CSS Color 4) and RGB with perceptual uniformity — modern and accurate.

🌈

OKLab ↔ RGB Color Converter

Converts between OKLab (perceptually uniform) and sRGB — basis for gradients without a gray dead zone.

🎬

SRT ↔ WebVTT Subtitle Converter

Converts subtitles between SRT (.srt) and WebVTT (.vtt) preserving timestamps and lines — useful for HTML5 video.

📝

SRT ↔ ASS/SSA Subtitle Converter

Converts SRT subtitles to Advanced SubStation Alpha (.ass) and back, preserving text and times.

💬

BBCode ↔ HTML Converter

Converts forum BBCode ([b], [url], [img], [quote]) to HTML and back — handy for migrating forum content.

🔁

Markdown ↔ BBCode Converter

Converts text between Markdown and BBCode preserving bold, italic, links and lists — useful for forums/Discord.

📊

CSV ↔ JSONL Converter

Converts CSV to JSON Lines (one JSON record per line) and back — a common format in data pipelines.

🔀

Graphviz DOT → Mermaid Converter

Converts a simple DOT (Graphviz) graph into Mermaid flowchart syntax — handy for docs.

📄

Markdown Table ↔ CSV Converter

Converts Markdown tables to CSV preserving alignment and back to Markdown.

🎵

Musical Key ↔ Camelot Wheel Converter

Converts musical keys (C major, A minor…) into Camelot notation (8B, 8A) used by DJs for harmonic mixing.

🔣

TeX Symbols ↔ Unicode Converter

Converts TeX/LaTeX commands (\alpha, \sum, \to) into their Unicode equivalents (α, ∑, →) and back.

🖨️

3D Slicer Color Converter

Converts a hex color into the syntax expected by 3D slicers (PrusaSlicer, Cura, Bambu) for color_print fields.

📜

Old Portuguese/Brazilian Units Converter

Converts old Portuguese units (alqueire, légua, vara, palmo, libra) into the current metric system.

🌾

Alqueire by Brazilian State Converter

Converts between alqueires (Paulista, Mineiro, Baiano, do Norte) and hectares — varies a lot by region.

📏

Rare Imperial Units Converter

Converts rare imperial units (rod, chain, furlong, league, hand, stone) into SI.

🏺

Egyptian Cubit Converter

Converts royal Egyptian cubit (52.5 cm), short cubit and palm to the metric system — historical use.

🌡️

Rankine/Réaumur/Newton Temperature Converter

Converts temperatures between Rankine, Réaumur and Newton — historical scales rarely used today.

💨

Pressure Converter (Torr/mmHg/atm)

Converts between Pa, kPa, bar, atm, mmHg, Torr, psi and mH₂O — complete for engineering and meteorology.

⚡

Energy Converter eV/J/kWh/cal

Converts between Joule, electron-volt (eV), kWh, BTU and calorie — useful in chemistry and physics.

⚖️

Density ↔ Volume ↔ Mass Converter

Triple converter: given two of density, mass and volume, computes the third with configurable units.

🔋

Battery Size Equivalence

Shows equivalence between AAA/AA/C/D/9V and IEC/ANSI standards (LR03/LR6, R03/R6, 6F22 etc.).

📃

Detailed Paper Sizes (A, B, C, ANSI, JIS)

Shows exact dimensions in mm and in for ISO A0-A10, B0-B10, C0-C10, ANSI A-E and JIS B0-B10.

📤

SQL INSERT to CSV Converter

Paste INSERT INTO statements and extract values into CSV with header from column names — useful for migrating dumps.

🎨

RGB / Lab / XYZ Color Converter

Convert colors between RGB, CIE L*a*b* and XYZ for print design and accurate cross-monitor color matching.

📍

Geohash ↔ Coordinates Converter

Convert latitude/longitude to Geohash with configurable precision (1-12 chars) and vice-versa, with cell explanation.

➕

Plus Code (OLC) Converter

Convert lat/lng to Plus Codes (Google Maps codes) and vice-versa, with configurable precision from neighborhood to 14m.

🔢

BCD Packed/Unpacked ↔ Decimal Converter

Convert between Binary-Coded Decimal (packed/unpacked) and decimal — useful for microcontrollers, RTCs and legacy systems.

🔄

JSON ↔ XML Converter

Convert between JSON and XML preserving attributes via @attr and text via #text, with pretty-print of the resulting XML.

🖼️

PNG/JPG to AVIF Converter

Convert PNG and JPG images to modern AVIF in the browser with quality control, preserving transparency and reducing size up to 50%.

📸

HEIC to JPG/PNG Converter

Convert iPhone HEIC photos to JPG or PNG directly in the browser, no upload, keeping quality and optional EXIF.

🐘

PHP serialize() ↔ JSON Converter

Convert PHP serialize() strings to JSON and vice versa, understanding arrays, objects, strings and primitive types of PHP's native format.

🐍

Python dict ↔ JSON Converter

Convert Python dictionaries (with single quotes, True/False/None) to valid JSON and back, handling special types.

💎

Ruby hash ↔ JSON Converter

Convert Ruby hashes (with :symbol => 'value' and shorthand syntax) to valid JSON and back, handling Ruby types.

📦

JSON5 ↔ JSON Converter

Convert JSON5 (with comments, trailing commas and unquoted keys) to standard JSON and back, preserving the structure.

📝

JSON ↔ Protobuf Text Format Converter

Convert between JSON and Protobuf Text Format (readable format used in Google APIs and configs), preserving basic types.

📊

CSV → GraphQL Schema Converter

Generate GraphQL type definitions from CSV, inferring types (String, Int, Float, Boolean) from the first N rows.

📡

MAC to IPv6 EUI-64 Converter

Build an IPv6 link-local address (fe80::) from a MAC address via Modified EUI-64, per RFC 4291.

⏳

Seconds to ISO 8601 Duration Converter

Convert a number of seconds (or minutes) into an ISO 8601 duration (PT1H30M, P1DT2H) — useful for APIs and calendars.

📑

YAML Anchor/Alias Flattener

Expand YAML aliases (*ref) and anchors (&id) by replacing them with literal values, producing standalone flattened YAML.

📦

Text to Data URI Base64 Converter

Convert plain text into a data:text/plain;base64,... Data URI ready to paste in CSS, HTML or for download via JS.

🧬

ASN.1 DER/BER Decoder

Paste hex or base64 bytes of an ASN.1 DER/BER structure and view the decoded tag tree — useful for X.509 certs.

🔐

SSL/TLS Certificate Decoder (PEM)

Paste a PEM certificate and view subject, issuer, validity, SAN, fingerprint and chain — without uploading the file.

🪪

CSR Decoder (PKCS#10)

Paste a Certificate Signing Request in PEM and view fields: CN, organization, SANs, public key algorithm and validity.

🔐

JWK ↔ PEM Converter

Convert cryptographic keys between JWK (JSON Web Key) and PEM (PKCS#8/SPKI) for RSA, EC and Ed25519 client-side.

⏰

Unix Cron → AWS EventBridge Converter

Convert standard Unix cron (5 fields) to AWS EventBridge/CloudWatch syntax (6 fields with year and ?), fixing day/week.

🗺️

MGRS ↔ Lat/Lng Converter (precise)

Convert MGRS (Military Grid Reference System) coordinates to latitude/longitude and vice versa, with configurable precision.

🗺️

GeoJSON Validator and Viewer

Paste GeoJSON, validate against RFC 7946, pretty-print and view feature counts, types and bbox. 100% client-side.

📐

WKT ↔ GeoJSON Converter

Convert between Well-Known Text (POINT, LINESTRING, POLYGON) and GeoJSON Feature/Geometry. Collections and Z-coordinates supported.

🗺️

GPX → GeoJSON Converter

Convert GPX files (tracks, waypoints, routes) into a GeoJSON FeatureCollection for modern map analysis. No upload.

🖼️

SVG → PNG Rasterizer

Rasterize SVG to PNG with custom size and transparent background. Useful for Open Graph, favicons and website exports.

🔄

IPv6 → ip6.arpa Converter

Generate the reverse `ip6.arpa` nibble-format name for any IPv6 address, ready for DNS PTR zones.

🔢

IPv4 Dec/Bin/Hex/Octal Converter

Convert an IPv4 address between four bases (dotted decimal, binary, hex, octal) with per-octet breakdown. Accepts 32-bit integer.

📈

XLSX to JSON Converter

Import Excel .xlsx files and convert each sheet into structured JSON rows. Automatic type detection.

📝

HTML to Markdown Converter

Paste HTML and generate Markdown (CommonMark / GFM) with support for tables, nested lists, syntax-highlighted code and links.

☕

YAML ↔ Properties Converter

Convert nested YAML files to Java .properties dot-notation (Spring Boot compatible) and back.

📱

SVG → React Native Converter

Paste SVG and generate React Native components using react-native-svg (Svg, Path, Circle), with props and optional TypeScript.

🗃️

CSV → SQLite Converter

Import a CSV and generate a downloadable SQLite (.db) database with the table created and populated. All in-browser via WASM.

🌐

BIND Zone File Builder

Build a complete BIND zone file with SOA, NS, A, AAAA, MX, TXT, CNAME from a visual form and export.

🔢

Base36 Bidirectional Converter

Convert decimal numbers and strings to Base36 (0-9, a-z) — useful for URL shorteners and short IDs.

🗺️

KML ↔ GeoJSON Converter

Convert Google Earth KML files to GeoJSON and vice versa, preserving coordinates, names and properties.

📅

Gregorian / Julian Date Converter

Convert dates between the Gregorian and old Julian calendars, showing day difference and proleptic mode.

📆

Julian Day / Date Converter

Convert a Julian Day Number (JDN) or Julian Date (JD with fraction) into a Gregorian/UTC date, and vice versa.

🔢

IPv6 / Binary Converter

Show every one of the 128 bits of an IPv6 address and convert from binary back to hex and canonical form.

🔐

PEM / DER Certificate Converter

Convert X.509 certificates between PEM (base64) and DER (binary hex view) format, with type detection.

🎬

Subtitle Converter SRT/VTT/ASS/SUB

Bidirectional converter between SRT, WebVTT, MicroDVD SUB and SubStation Alpha (ASS) preserving timing and basic formatting.

📡

Feed Converter RSS/Atom/JSON Feed

Bidirectional converter between RSS 2.0, Atom 1.0 and JSON Feed 1.1 preserving entries, links, author and enclosures.

🗨️

HTML <-> BBCode Converter

Bidirectional HTML <-> BBCode converter ([b][i][url=]) useful for forum software, with tag whitelist.

☕

.properties <-> YAML Converter

Convert .properties (Java/Spring) <-> nested YAML by dot-notation (a.b.c=1 becomes a: { b: { c: 1 } }).

📄

HAR -> OpenAPI 3.0 Converter

Generate an initial OpenAPI 3.0 from a DevTools-exported HAR: extracts paths, methods, headers, and bodies.

🏦

CNAB 240 -> CSV Converter

Convert Brazilian CNAB 240 bank return file to readable CSV, decoding segments and occurrence codes.

⏱️

SRT/VTT CPS Checker

Calculates characters per second (CPS) of each SRT and WebVTT subtitle line highlighting entries above the recommended 17 CPS limit.

🕒

SRT Time Shifter

Advances or delays all SRT subtitles by N milliseconds or seconds, ideal to sync desynchronized subtitles with video.

🗺️

UTM Coordinates Batch Converter (CSV)

Converts list of decimal geographic coordinates to UTM zone+northing/easting in bulk via CSV, returning resulting CSV file.

♟️

PGN to FEN Position Extractor

Paste a chess game in PGN format and choose a move number to extract the equivalent FEN position at that point of the game.

🔢

Base91 Encode/Decode Converter

Encodes and decodes data in Base91, a more efficient encoding than Base64 used in serial communication and niche applications.

🌐

Glob to Regex Converter (Multi-Flavor)

Converts glob to regex in multiple flavors: JavaScript, Python, Java, Go, PCRE, with options for case-sensitive and dot-match-all.

🔄

CSV Transpose (Rows / Columns)

Transposes CSV rows and columns swapping axes, useful to reorganize narrow into wide spreadsheets.

🔃

UTF-16 LE / BE Converter

Converts UTF-16 hex bytes between little-endian and big-endian by swapping the byte order of each code unit.

📊

CSV Wide to Long Converter (Melt)

Converts wide CSV (one row per entity) into long format (one row per variable), similar to pandas melt.

🏦

OFX to CSV Bank Statement Converter

Parses OFX/QFX banking files and exports transactions as CSV with date, description, amount and type.

📄

HTML Table to CSV Converter

Paste HTML with tables and extract each table as CSV while preserving colspan/rowspan as repeated cells.

📚

CSV to Wikitext Table Converter

Converts CSV into MediaWiki/Wikipedia table syntax with header row and optional classes.

📱

CSV to Android strings.xml

Convert CSV spreadsheets (key, locale, value) into Android strings.xml files for multiple languages with plurals support and XML escaping.

🍎

CSV to iOS Localizable.strings

Generate iOS Localizable.strings (UTF-16 LE) and stringsdict files from CSV spreadsheets with keys and translations per language.

📱

CSV to Flutter ARB Converter

Transform CSV spreadsheets into Flutter ARB (Application Resource Bundle) files for internationalization with ICU placeholder metadata.

🌍

Gettext PO and CSV Converter

Convert gettext .po files (msgid, msgstr, fuzzy, plural) to editable CSV and back, preserving context and comments.

📄

XLIFF to CSV Converter

Parse XLIFF 1.2 and 2.0 files (XML Localization Interchange) extracting trans-units to editable CSV with source/target/state.

🦊

Fluent FTL and JSON Converter

Convert Mozilla Project Fluent (.ftl) files to JSON and back, preserving selectors, attributes and references.

🧮

LaTeX to MathML Converter

Convert LaTeX formulas to MathML ready to paste in HTML5 with no KaTeX/MathJax dependency, supporting common operators and fractions.

📐

MathML to AsciiMath Converter

Transform MathML to AsciiMath notation, easy to type for forums and Markdown math.

🔣

LaTeX to Unicode Math

Replace LaTeX commands (\alpha, \sum, \to, \mathbb{R}) with their mathematical Unicode characters.

🔤

IPA ↔ X-SAMPA Converter

Convert IPA transcriptions to X-SAMPA (ASCII-only) and vice versa, useful for systems that don't support phonetic Unicode.

📚

BibTeX to CSL-JSON Converter

Convert BibTeX (.bib) entries to CSL-JSON (Citation Style Language) used by Zotero, Pandoc, and modern processors.

🔄

ISO-8859-1 ↔ UTF-8 Converter

Convert text between ISO-8859-1 (Latin-1) and UTF-8 by detecting mojibake (é, ç, Â) and offering automatic correction.

🧮

LaTeX Equation to Image

Render LaTeX equations as transparent PNG image, ready for Slack, Notion or docs. Supports MathJax/KaTeX.

📐

LaTeX direct to AsciiMath

Paste MathML or LaTeX and get clean AsciiMath, without needing intermediate MathML. Ideal for Markdown.

🧪

SMILES to Molecular Formula Converter

Enter a SMILES notation and get the raw molecular formula (e.g., C2H6O for ethanol) and approximate molar mass.

🗺️

UTM ↔ MGRS Bidirectional Converter

Convert between UTM coordinates and MGRS (Military Grid Reference System) both ways, with configurable precision.

🎨

OKLCH ↔ RGB/HSL Color Converter

Convert colors in perceptual OKLCH space (CSS Color 4) to RGB, HSL and Hex. Visualize gamut and sRGB fallback.

⚛️

SVG to React Component (JSX) Converter

Paste an SVG and get a React component (.jsx or .tsx) with props (color, size), camelCase attributes and forwarded ref.

🔌

EIA-96 Resistor SMD Decoder

Decodes EIA-96 SMD resistor codes (e.g. 39D = 249kΩ) using the 96-value table + letter multipliers. Useful for electronics repair.

⚡

SMD Capacitor Code Decoder

Decodes numeric SMD capacitor codes (e.g. 104 = 100 nF) and EIA letter codes. Computes capacitance in pF/nF/µF.

🧗

Climbing Grade UIAA to British Trad Converter

Convert between UIAA system (I-XII) and British trad adjectival grades (Mod, Diff, VS, HVS, E1-E11). Covers traditional climbing.

🪵

Board Feet, Cubic Feet and Liters Converter

Convert board feet to cubic feet to cubic meters to liters. Supports multiple boards and species density to estimate weight.

☕

Coffee TDS to Extraction Yield Converter

From TDS (refractometer), dose mass and beverage weight, computes extraction yield (target 18-22%) and strength in mg/ml.

📅

Date to ISO Week and Fiscal Quarter Converter

Given a date, convert to ISO week and customizable fiscal quarter (start month 1-12). Includes fiscal year number.

🔤

Base32-hex (RFC 4648 §7) Encoder/Decoder

Encode and decode strings using the Base32-hex alphabet (0-9, A-V) — RFC 4648 §7 variant used in DNS NSEC3 and sortable identifiers.

🔁

TSV ⇄ JSON Converter

Converts a TSV (tab-separated values) table to a JSON array of objects and vice versa. Preserves basic types (number, boolean, null) with a toggle.

🌊

Douglas Sea State Scale

Convert significant wave height (m) to a Douglas degree 0–9 (calm → phenomenal) with descriptor and full reference table.

🌡️

Kelvin to RGB (Blackbody) Converter

Converts color temperature in Kelvin (1000K-40000K) to approximate RGB (Tanner Helland) — useful for stage lighting.

🎨

HWB and RGB Converter

Converts HWB color (Hue/Whiteness/Blackness — CSS4) to RGB and back, an intuitive paint-mix model.

🔄

JSON to XML Converter (with @ attributes)

Converts JSON to XML preserving arrays as repeated elements and supporting attributes prefixed with @.

📋

CSV/TSV/PSV Batch Converter

Auto-detects delimiter (CSV/TSV/PSV/custom) and converts between them preserving quotes and newlines.

🔤

JSON Schema → TypeScript Types

Convert a JSON Schema (Draft 7/2020-12) to TypeScript definitions (interface/type) recursively — objects, arrays, enums, oneOf as union, internal $ref. Output ready to paste into a .d.ts.

⚙️

HOCON ↔ JSON Converter

Convert HOCON (Human-Optimized Config Object Notation used by Akka/Play) to JSON and back. Supports dot-path includes, null fallback and nested objects via dot-notation.

🔁

Two's Complement Converter (8/16/32/64-bit)

Convert between signed decimal, binary and hex using two's complement representation for 8, 16, 32 and 64-bit widths. Shows step-by-step of negation (invert bits + 1).

🧭

DMS↔Decimal Coordinates Batch Converter

Paste a list of (lat,lon) coordinates per line — in decimal (-23.55) or DMS (23°33'00"S) — and convert all to both formats. Detects hemisphere, validates bounds (lat ±90, lon ±180) and reports errors per line.

🌡️

Color Temperature (CCT Kelvin → RGB) Converter

Convert correlated color temperature (CCT) in Kelvin to sRGB and hex using Tanner Helland's approximation. Supports 1000K–40000K, with presets (candle 1900K, tungsten 2700K, halogen 3200K, daylight 6500K, blue sky 10000K). Also shows mireds.

☕

JSON to .properties (Java)

Convert a JSON object into a Java .properties file, flattening nested objects with dot notation (db.host=localhost) and arrays with indices (list.0=a). Ready to paste into application.properties.

☕

.properties (Java) to JSON

Convert a Java .properties file into JSON, rebuilding nested objects from dotted keys (db.host becomes {db:{host:…}}). Ignores comments (# and !) and blank lines.

🗺️

Polyline Encoder (Google Maps)

Encode a list of (lat,lng) coordinates into Google Maps' Encoded Polyline Algorithm format and decode polylines back into coordinates. Used by routing, Directions and map APIs.

📆

Excel Serial Date Converter

Convert an Excel serial date number (e.g. 44197) to a calendar date and back, honoring Excel's 1900 date system (including the historical 1900 leap-year bug). Useful for cleaning exported spreadsheets.

➗

Continued Fraction Converter

Convert a decimal number into its continued fraction expansion [a0; a1, a2, …] and show the convergents (best rational approximations). Used in number theory and to approximate constants like π, e and √2.

🧮

Infix to Postfix (RPN) Converter

Convert an infix math expression (e.g. 3 + 4 × 2) into postfix / reverse Polish notation (RPN) using Dijkstra's shunting-yard algorithm, and evaluate the result. Supports + − × ÷ ^ and parentheses.

🔢

Zeckendorf Representation Converter

Convert a positive integer into its Zeckendorf representation — the unique sum of non-consecutive Fibonacci numbers — and show the terms used. It is the theoretical basis of Fibonacci codes.

🔢

Negabinary (base −2) Converter

Convert decimal numbers to base −2 (negabinary), which represents positive and negative integers with no sign bit, and convert back to decimal. A curiosity of positional numeral systems.

🎨

RGB565 Color Converter

Convert a 24-bit RGB color (#RRGGBB) into the 16-bit RGB565 format used by embedded displays (TFT, OLED, Arduino) and back, showing the value in hexadecimal (0x…) and decimal.

🧭

Compass Bearing Converter

Convert a bearing in degrees (0–360°) into its cardinal direction (N, NNE, NE, … on a 16-point rose) and back. Useful in navigation, weather, drones and GPS.

🔠

Excel Column Converter (Letter ↔ Number)

Convert a spreadsheet column letter (A, B, …, Z, AA, AB, …) into its index number (1, 2, …, 27, …) and back, using Excel and Google Sheets' bijective base-26 system.

🖥️

RGB to ANSI 256 Color Converter

Convert an RGB color (#RRGGBB) into the nearest code of the 256-color ANSI palette used by terminals, and show the shell escape code. Useful for colored prompts, logs and TUIs.

🌫️

Opacity to Hex Alpha Converter

Convert an opacity percentage (0–100%) into the hexadecimal alpha-channel byte (00–FF) used in 8-digit CSS colors (#RRGGBBAA) and back, showing the equivalence.

📑

A1 ↔ R1C1 Reference Converter

Convert an A1-style cell reference (e.g. B3, AA10) into R1C1 style (e.g. R3C2) used in spreadsheets and macros, and back. Handy when writing formulas, VBA and Google Apps Script.

🔢

Balanced Ternary Converter

Convert decimal numbers to balanced ternary (digits −1, 0, +1 written as T, 0, 1) and back. Used in the historical Setun computer and some algorithms. Also shows standard ternary.

🔢

Factorial Base (Factoradic) Converter

Convert a decimal number to the factorial number system (factoradic), where position i is worth i!, and back. It is the basis of Lehmer's algorithm for enumerating permutations. Shows digits per position.

➗

Egyptian Fraction Converter

Convert a proper fraction (e.g. 3/4) into a sum of distinct unit fractions (1/2 + 1/4) using Fibonacci's greedy algorithm. Egyptian fractions were how Ancient Egypt represented fractions.

🔌

Capacitor Code Converter

Convert the 3-digit code printed on ceramic capacitors (e.g. 104) into capacitance in picofarads, nanofarads and microfarads, and back. Essential for electronics and prototyping.

🔢

Fixed-Point (Q Notation) Converter

Convert floating-point numbers into fixed-point Q notation (e.g. Q8.8, Q15) used in DSP and embedded systems, and back. Shows the stored integer and the reconstructed value.

📐

Polar ↔ Cartesian Coordinate Converter

Convert polar coordinates (radius r and angle θ) into Cartesian coordinates (x, y) and back, in 2D, with the angle in degrees or radians. Useful in physics, graphics and robotics.

🔊

Decibel to Ratio Converter

Convert a decibel (dB) value into the corresponding power and amplitude ratio, and back. Reminder: +3 dB ≈ double the power and +6 dB ≈ double the amplitude. Used in audio, RF and electronics.

🎨

CSS Short ↔ Long Hex Converter

Expand 3-digit CSS hex colors (#f80) to 6 digits (#ff8800) and collapse them back when possible. Also handles the 4/8-digit alpha form (#f80a ↔ #ff8800aa).

🤖

Android Color (int ↔ hex) Converter

Convert an Android color integer (ARGB, e.g. −16777216 or 0xFF000000) to #AARRGGBB hex and back. Useful when debugging themes, resources and Kotlin/Java code.

🔢

Indian Numbering (Lakh/Crore) Converter

Format a number with the Indian grouping system (12,34,567) and show its value in lakhs and crores. Used in India and South Asia, where 1 lakh = 100 thousand and 1 crore = 10 million.

𝍷

Tally Marks Converter

Convert a number into tally marks grouped in fives and convert marks back into a number. Used for counting votes, game points and inventory by hand.

〰️

Wavelength ↔ Frequency Converter

Convert the wavelength of electromagnetic radiation (light, radio) to frequency and back, using the speed of light c ≈ 299,792,458 m/s. Enter meters and see Hz, MHz and GHz.

🎞️

RGB ↔ YCbCr Color Converter

Convert colors between RGB (8-bit) and the YCbCr space used in JPEG and digital video (luma Y and chroma Cb, Cr), per ITU-R BT.601. Useful in image processing and compression.

🍷

Brix ↔ Gravity Converter

Convert degrees Brix (°Bx, sugar content) to the specific gravity of the must and back, using the standard brewers' and winemakers' formula. Useful for fermenting beer, wine and kombucha.

🛢️

API Gravity (Petroleum) Converter

Convert an oil's API gravity (American Petroleum Institute) to its specific gravity at 60 °F and back. The higher the API number, the lighter the crude. Used in the oil and gas industry.

📡

dBm ↔ Watts Converter

Convert power between dBm (decibels relative to 1 mW) and watts/milliwatts, and back. Essential in RF, Wi-Fi, fiber optics and telecom: 0 dBm = 1 mW, 30 dBm = 1 W.

🎵

Musical Note ↔ Frequency Converter

Convert a musical note name (e.g. A4, C#5) into its frequency in hertz and back, using A4 = 440 Hz and equal temperament. Shows the nearest note and the deviation in cents.

🎨

RGB Decimal (Web) Color Converter

Convert an RGB color represented as a single 24-bit decimal number (0 to 16,777,215) to #RRGGBB hex and back. Used in code-generated CSS, APIs and databases.

🔄

Angle Converter (turns, degrees, radians, gradians)

Convert an angle between turns (revolutions), degrees, radians and gradians (gons) at once. One full turn equals 360°, 2π radians or 400 gradians. Useful in math, engineering and graphics.

🌈

RGB ↔ HSI Color Converter

Convert colors between RGB and the HSI space (hue, saturation, intensity), widely used in image processing because it separates intensity from color information intuitively. Distinct from HSL and HSV.

🔢

Eastern Arabic Numerals Converter

Convert Western digits (0–9) into Eastern Arabic numerals (٠–٩) used in Arabic, Persian and Urdu, and back. It is a positional, digit-by-digit substitution.

🔢

Devanagari Numerals Converter

Convert Western digits (0–9) into Devanagari numerals (०–९) used in Hindi, Marathi, Nepali and Sanskrit, and back. Positional digit-by-digit substitution.

🔢

Maya Numerals Converter

Convert a decimal number into the Maya vigesimal (base-20) system, drawn with dots (1), bars (5) and the zero shell, stacked by position. Converts back to decimal too.

🧮

Soroban Abacus Representation

Show a number on the Japanese soroban abacus as ASCII art, with the heaven bead (value 5) and earth beads (value 1) of each decimal column. Helps to understand and teach abacus calculation.

💡

Lumen ↔ Lux Converter

Convert luminous flux (lumens) to illuminance (lux) and back, given the lit area in square meters. Lux is lumen per square meter. Useful in lighting, photography and ergonomics.

💡

Watt ↔ Lumen Converter

Convert electrical power (watts) to luminous flux (lumens) and back, using luminous efficacy in lm/W (default 80 for LED). Helps compare LED, fluorescent and incandescent bulbs.

🔦

Candela ↔ Lumen Converter

Convert luminous intensity (candelas) to luminous flux (lumens) and back, from the solid angle in steradians (the full sphere is 4π ≈ 12.57 sr). Used in lighting design and lasers.

🗺️

Map Scale Converter

Convert distances between map and real world from the scale (e.g. 1:25,000): from centimeters on the map to real distance in meters and kilometers, and the reverse. Essential in cartography and hiking.

🚗

Model Scale Converter

Convert measurements between the real object and the miniature from the scale (e.g. 1:72, 1:35, 1:18): from real size in millimeters to model size, and back. For dioramas, kits and model railroading.

🎬

SMPTE Timecode ↔ Frames Converter

Convert an SMPTE timecode in HH:MM:SS:FF format into a total frame count and back, for a given frame rate (fps). Non-drop-frame mode. Essential in video and audio editing.

🌐

Spherical ↔ Cartesian Coordinate Converter

Convert 3D spherical coordinates (radius r, polar angle θ and azimuth φ) to Cartesian (x, y, z) and back, in the physics convention. Useful in physics, 3D graphics and robotics.

🛢️

Cylindrical ↔ Cartesian Coordinate Converter

Convert 3D cylindrical coordinates (radius ρ, angle φ and height z) to Cartesian (x, y, z) and back. Common in electromagnetism, mechanics and modeling axially symmetric objects.

📊

Basis Points (bps) ↔ Percent Converter

Convert between basis points (bps), percent (%) and per mille (‰). 1% equals 100 bps and 10‰. Widely used in finance, interest rates, spreads and fund management fees.

🎨

CIELab ↔ LCh Color Converter

Convert colors between the CIELab space (L, a, b) and its cylindrical CIELCh form (lightness L, chroma C and hue h). LCh is more intuitive for adjusting saturation and tone perceptually.

🎚️

RGB Color (0–255 ↔ 0.0–1.0) Converter

Convert RGB colors between the byte range (0 to 255) and the normalized float range (0.0 to 1.0) used in shaders, OpenGL, Unity, Unreal and CSS color(). Includes the hex value.

⚫

RGB to Grayscale Converter

Convert an RGB color to grayscale by three methods: simple average, weighted luminosity (Rec. 601) and lightness (average of max and min). Shows the different results side by side.

🌈

sRGB ↔ Linear Color Converter

Apply and remove the sRGB gamma correction, converting each channel between sRGB (gamma-encoded) values and the linear values used in physically correct lighting and color blending.

🖌️

RGB ↔ CMY Color Converter

Convert colors between the additive RGB model and the subtractive CMY model (cyan, magenta, yellow), via the simple relation C = 1 − R. The theoretical basis of printing; CMYK adds black.

🎚️

Bit Depth ↔ Dynamic Range Converter

Compute the dynamic range (SNR) in decibels from audio bit depth (16-bit ≈ 98 dB, 24-bit ≈ 146 dB) and estimate the bits needed for a given dynamic range. Formula: 6.02 × bits + 1.76 dB.

🎹

Note ↔ Piano Key Converter

Convert a musical note name (e.g. A4, C#5) into its key number on an 88-key piano (A0 = key 1, C8 = key 88) and back. Useful for musicians and instrument programming.

⚗️

Moles ↔ Grams Converter

Convert between amount of substance (moles) and mass (grams) given the molar mass (g/mol): mass = moles × molar mass. Essential in stoichiometry and chemistry calculations.

📚

ISBN-10 ↔ ISBN-13 Converter

Convert an ISBN-10 to ISBN-13 (with the 978 prefix) and back, recomputing the correct check digit in each format. Used by books, publishers and libraries.

⚛️

Mass ↔ Energy (E=mc²) Converter

Convert mass to energy and back via Einstein's equation E = mc², with c = 299,792,458 m/s. Enter mass in kilograms to get energy in joules, and the reverse. Demonstrates mass-energy equivalence.

🧪

pH, pOH and Concentration Converter

Convert between pH, pOH, H⁺ ion concentration and OH⁻ concentration at 25 °C, using pH + pOH = 14 and [H⁺] = 10⁻ᵖᴴ. Tells whether the solution is acidic, neutral or basic.

🔊

dBFS ↔ Linear Amplitude Converter

Convert between dBFS (decibels relative to digital full scale) and linear amplitude (0 to 1) in digital audio: 0 dBFS = amplitude 1.0 (max) and −6 dBFS ≈ half. Formula: dBFS = 20·log₁₀(amplitude).

🔉

Sound Frequency ↔ Wavelength Converter

Convert between a sound's frequency (Hz) and its wavelength, using the speed of sound in air (343 m/s at 20 °C, adjustable). Useful in acoustics, room treatment and instrument building.

🎲

Betting Odds Converter (Decimal, Fractional, American)

Convert betting odds between decimal (European), fractional (British) and American (moneyline) formats, and show the matching implied probability. Indispensable for bettors.

📉

Real ↔ Nominal Rate (Fisher) Converter

Compute the real interest rate from the nominal rate and inflation (and vice versa) via the Fisher equation: (1 + nominal) = (1 + real) × (1 + inflation). Shows the gap between apparent and real gain.

🔄

Angular Velocity Converter (rad/s, RPM, °/s)

Convert angular velocity between radians per second (rad/s), revolutions per minute (RPM) and degrees per second (°/s). One full turn equals 2π rad or 360°. Useful in mechanics, motors and robotics.

〰️

Frequency ↔ Period Converter

Convert between a signal's frequency (hertz) and its period (seconds), which are inverses: period = 1 / frequency. Also shows ms and µs. Useful in electronics and wave physics.

🚗

Old ↔ Mercosur License Plate Converter

Convert a Brazilian vehicle plate from the old pattern (ABC-1234) to the Mercosur pattern (ABC1C34) and back, applying the official replacement of the fifth character with a letter (0=A, 1=B, …, 9=J).

🎨

RGB Color (0–255 ↔ Percent) Converter

Convert RGB color values between the 0–255 range and the percentage notation (0% to 100%) accepted by the CSS rgb() function, also showing the matching hexadecimal.

🧭

Bearing Between Coordinates Calculator

Compute the initial bearing (azimuth, 0 to 360°) from a starting point (lat, lon) to a destination on the Earth's surface, with the matching cardinal direction. Useful in navigation, drones and GPS.

💱

Forex Pip Value Calculator

Compute the monetary value of a pip in a forex trade from the position size (units) and the pip size. For most pairs 1 pip = 0.0001; for JPY pairs, 1 pip = 0.01.

💹

Forex Lot Size (Units) Converter

Convert between forex lot sizes and the number of base-currency units: 1 standard lot = 100,000 units, 1 mini = 10,000, 1 micro = 1,000 and 1 nano = 100. Essential for risk management.

📅

Year Fraction (Day Count) Converter

Compute the year fraction between two dates using the day-count conventions used in interest and bonds: 30/360, Actual/360 and Actual/365. Indispensable in finance and fixed income.

🔢

Short ↔ Long Scale (Billion) Converter

Show the name of a large number in the short scale (US: billion = 10⁹) and the long scale (continental Europe and old Brazil: bilhão = 10¹²). Clears up the 'billion' vs 'bilhão' confusion.

♿

APCA Contrast Calculator

Compute the APCA contrast (Lc) between a text color and the background — the modern algorithm planned for WCAG 3 that replaces the traditional contrast ratio with a more perceptually accurate measure. Lc 60+ is recommended for body text.

🎨

Perceived Brightness (HSP) Calculator

Compute a color's perceived brightness via Darel Rex Finley's HSP formula (with perceptual weights 0.299, 0.587 and 0.114) and tell whether white or black text contrasts better on it.

📺

RGB ↔ YPbPr Color Converter

Convert colors between RGB and the YPbPr space (analog component video), with luma Y and the color differences Pb and Pr, per Rec. 601. Used in component video connections.

🔤

Base32 Encoder (RFC 4648)

Encode and decode text in Base32 per RFC 4648, using the 32-character alphabet (A–Z and 2–7) with '=' padding. Ideal for human-readable identifiers, TOTP tokens and data that must survive case-insensitive systems.

🔡

Base45 Encoder (RFC 9285)

Encode and decode text in Base45 per RFC 9285, the scheme used in EU COVID digital certificate QR codes. It packs each pair of bytes into 3 characters of the 45-symbol alphabet, optimized for the QR code alphanumeric mode.

🔠

Ascii85 / Base85 Encoder

Encode and decode text in Ascii85 (Base85, Adobe variant with <~ ~> delimiters), representing 4 bytes as 5 printable ASCII characters. More compact than Base64, it is used in PostScript and PDF.

📦

Uuencode / Uudecode

Encode and decode data in the classic Unix Uuencode format, with a 'begin' header, 6-bit blocks mapped to printable ASCII and an 'end' footer. Historically used to send binaries over e-mail and Usenet.

🔐

Vigenère Cipher

Encrypt and decrypt text with the Vigenère cipher, a polyalphabetic substitution that shifts each letter by the matching letter of a repeated keyword. Non-alphabetic characters are preserved.

🔄

Atbash Cipher

Encrypt and decrypt text with the Atbash cipher, a monoalphabetic substitution that mirrors the alphabet (A↔Z, B↔Y, …). It is its own inverse: applying it twice restores the original text. Non-alphabetic characters are preserved.

🚂

Rail Fence Cipher

Encrypt and decrypt text with the Rail Fence cipher, a transposition cipher that writes letters in a zig-zag across N rails and reads them row by row. Configure the number of rails to vary the result.

🔢

A1Z26 Cipher

Convert text to the A1Z26 cipher and back, mapping each letter to its position in the alphabet (A=1, B=2, …, Z=26). Numbers are separated by hyphens and words by spaces. Common in puzzles and clue-hunting games.

🥓

Bacon Cipher

Encrypt and decrypt text with Bacon's cipher, a steganography that encodes each letter as a sequence of five 'A' and 'B' (5-bit binary). It uses the distinct 26-letter alphabet. Non-alphabetic characters are ignored when encrypting.

🔊

Neper ↔ Decibel Converter

Convert gains and attenuations between neper (Np) and decibel (dB), the two logarithmic ratio units. For field quantities (voltage, current, pressure) 1 Np = 8.6859 dB. Useful in telecommunications, acoustics and electronics.

🛢️

Viscosity Converter (Poise, Stokes, SI)

Convert dynamic viscosity between pascal-second, poise and centipoise, and kinematic viscosity between square meter per second, stokes and centistokes. Pick the quantity and the source and target units. Essential in fluid mechanics and lubrication.

⚗️

Baumé ↔ Density Converter

Convert between degrees Baumé (°Bé) and specific gravity (relative density), on both scales: for liquids heavier than water and for liquids lighter than water. The Baumé scale is used in the chemical, food and beverage industries (syrups, brines, acids).

✈️

Mach Number ↔ Mach Angle Converter

Convert between the Mach number (M) and the Mach angle (μ) of the shock cone in supersonic flight, via μ = arcsin(1/M). Valid for M ≥ 1. Useful in aerodynamics and the study of shock waves.

⚖️

BMI ↔ BMI Prime & Ponderal Index

Compute the BMI (body mass index), BMI Prime (the ratio of BMI to the upper healthy limit of 25) and the ponderal index from weight and height. BMI Prime shows directly how far above or below the ideal weight you are.

📐

Typographic Point Converter (pt, pica, Didot, mm)

Convert between typographic units: PostScript point (1/72 inch), pica (12 points), Didot point, cicero, millimeter and inch. Indispensable in layout, typography and editorial design.

🌳

Stern-Brocot Converter (Fraction ↔ L/R Path)

Convert a fraction to the left/right (L/R) path that locates it in the Stern-Brocot tree, and back. The tree generates every positive rational exactly once via the mediant of two neighboring fractions. Useful for continued fractions and rational approximations.

🏛️

Roman Fraction Converter (Unciae)

Convert fractions to the Roman twelfths notation (the unciae system), where each twelfth is a dot (·) and the half is S (semis), and back. The Romans used base 12 for fractions; the result combines the Roman numeral of the integer part with the fractional symbols.

🔢

Dyadic (Binary) Fraction Converter

Convert a decimal number to its binary fractional representation (e.g. 0.375 = 0.011₂ = 3/8) and back. Shows whether the expansion is finite (a dyadic number, with a power-of-two denominator) or repeating. Useful in computing and number theory.

🎨

RGB ↔ CIE xyY Color Converter

Convert colors between RGB (sRGB, D65) and the CIE xyY space, which separates chromaticity (the x and y coordinates of the CIE 1931 diagram) from luminance (Y). The sRGB primaries fall at known x,y: red (0.64, 0.33), green (0.30, 0.60) and blue (0.15, 0.06).

🌀

Fibonacci Coding (Encoder)

Encode positive integers in Fibonacci coding, a self-delimiting universal code based on the Zeckendorf representation: each number becomes a binary word that always ends in '11', so numbers can be separated without markers. Decodes back too.

γ

Elias Gamma Coding (Encoder)

Encode positive integers in Elias gamma coding, a universal prefix code: write N zeros followed by the binary representation of the number (N+1 bits). It is optimal when small numbers are far more frequent than large ones. Encodes and decodes.

δ

Elias Delta Coding (Encoder)

Encode positive integers in Elias delta coding, which encodes the length of the number with the gamma code and then the remaining bits. It is asymptotically more efficient than gamma for large numbers. Encodes and decodes full sequences.

🎚️

Golomb-Rice Coding (Encoder)

Encode non-negative integers in Golomb-Rice coding with parameter k (M = 2^k): the quotient n div M is written in unary and the remainder n mod M in k bits. Used in audio (FLAC, Shorten) and image compression. Encodes and decodes.

🖥️

EBCDIC ↔ Text Converter

Convert text between ASCII and EBCDIC (code page 037), the character encoding of IBM mainframes. Shows the EBCDIC bytes in hexadecimal and rebuilds the text from them. Useful for integrating with legacy z/OS and AS/400 systems.

🔡

z-base-32 Encoder

Encode and decode data in z-base-32, the Base32 variant created by Zooko optimized for human reading and typing, with an alphabet that avoids ambiguous characters and uses no padding. Used in Tahoe-LAFS keys and media links.

🏛️

Roman Numerals with Vinculum (Large Numbers)

Convert large numbers into Roman numerals using the vinculum — the bar over a numeral that multiplies it by a thousand (V̄ = 5000, X̄ = 10000). It allows values up to the millions, which ordinary Roman numerals cannot reach. Converts both ways.

🔢

Bijective Numeration (Base-k)

Convert positive integers to bijective numeration in any base k and back. Unlike ordinary positional notation, it uses no zero digit and the digits run from 1 to k, giving every number a unique representation — as in spreadsheet columns A, B, C (bijective base 26).

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Skew Binary Number System

Convert integers between decimal and the skew binary number system, where the least significant non-zero digit may be 2 and each position has value 2^(k+1)−1. This system lets you increment a number by changing few digits, useful in functional data structures.

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NegaFibonacci Coding

Represent any integer — positive or negative — in NegaFibonacci coding, which uses Fibonacci numbers of negative index. Every integer has a unique representation with no two consecutive 1s. Converts decimal ↔ NegaFibonacci both ways.

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Pitch Notation: Helmholtz ↔ Scientific

Convert note names between Helmholtz notation (C, c, c′, c″) and scientific pitch notation (C3, C4, C5…), the two systems for identifying the exact octave of a note. C4 (middle C) corresponds to one-line c. Keeps sharps and flats.

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Note Names: C-D-E ↔ Do-Re-Mi

Convert note names between the Anglo-Saxon letter system (C, D, E, F, G, A, B) and Latin solfège (Do, Re, Mi, Fa, Sol, La, Si), used in Brazil and Europe. Preserves sharps (#) and flats (b) and converts whole sequences at once.

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Burrows-Wheeler Transform (BWT)

Apply and reverse the Burrows-Wheeler Transform, which rearranges a text's characters to group similar ones together for easier compression (the heart of bzip2). It uses an end-of-text marker so the transform is reversible without an extra index.

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Move-to-Front (MTF) Coding

Encode and decode text with the Move-to-Front transform, which replaces each symbol by its index in a list and moves it to the front. It turns repeated symbols into zeros, preparing data for entropy compression (used after the BWT in bzip2).

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Huffman Coding (Compression)

Build the optimal Huffman tree for a text and show the binary code of each symbol, the total number of bits and the savings over 8-bit ASCII. Huffman coding assigns shorter codes to more frequent symbols — the basis of ZIP, JPEG and MP3.

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GPS Week ↔ UTC Date

Convert between the GPS week number with the time of week (TOW, in seconds) and the corresponding UTC date and time. The count starts at the GPS epoch, 6 January 1980. Useful in geodesy, tracking and processing of GNSS receiver data.

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Delta Encoding (Sequences)

Apply and reverse delta encoding of a number sequence: store the first value and then only the differences between consecutive values. When numbers vary little, the differences stay small and compress better. Used in time series, audio and versioning.

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Babylonian Numerals (Base 60)

Convert decimal numbers to the Babylonian sexagesimal (base 60) system and back. Each digit from 1 to 59 is written with tens (<) and ones (|) symbols, grouped into base-60 positions. It is the oldest positional notation, ancestor of our minutes and degrees.

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Elias Omega Coding (Encoder)

Encode positive integers in Elias omega coding, a recursive universal code that repeatedly prepends the length of the previous group in binary until a single bit remains. It is more efficient than the gamma and delta codes for very large numbers. Encodes and decodes.

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Greek Attic (Acrophonic) Numerals

Convert numbers to the Attic (acrophonic) numerals of ancient Greece and back. The system uses Ι for 1, Γ for 5, Δ for 10, Η for 100, Χ for 1000 and Μ for 10000, combining Γ with the others for multiples of five (ΓΔ = 50). It predates the Ionic Greek letter numerals.

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djb2 Hash (Non-Cryptographic)

Compute the djb2 hash of a text, Daniel J. Bernstein's popular function that starts at 5381 and for each character does hash × 33 + code. Returns a 32-bit value. Widely used in hash tables for being fast with good dispersion. Not for security.

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SDBM Hash

Compute the SDBM hash of a text, the function used in the SDBM database library and ndbm. For each character it applies hash = c + (hash << 6) + (hash << 16) − hash, yielding 32 bits. Simple and well-distributed for hash table keys.

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System V Checksum (sum -s)

Compute the 16-bit checksum of the System V Unix sum utility (-s option): it sums all bytes and folds the carries back. Also shows the number of 512-byte blocks. A simple integrity checker still found in legacy Unix scripts.

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LZW Compression (Lempel-Ziv-Welch)

Encode and decode text with the LZW algorithm, which builds a dynamic dictionary of sequences as it reads the data and replaces them with numeric codes. It is the algorithm of the GIF format and Unix compress. Shows the list of generated codes.

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LZ78 Compression

Encode and decode text with the LZ78 algorithm, which builds a dictionary of phrases and emits (index, character) pairs representing the previous phrase plus a new symbol. It is the theoretical basis of LZW and the dictionary compressor family.

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Shannon-Fano Coding

Build the Shannon-Fano codes for a text: sort symbols by frequency and recursively split the set into two halves of balanced weight, assigning 0 and 1 to each side. Shows each symbol's code and the total bits. It is the precursor of Huffman coding.

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QWERTY ↔ Colemak Keyboard Converter

Convert text between what would be typed on the same physical keys in the QWERTY and Colemak layouts. Colemak rearranges the letters to reduce finger movement while keeping common shortcuts, a modern alternative to Dvorak. Useful when switching layouts.

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QWERTY ↔ AZERTY Keyboard Converter

Convert text between the QWERTY and AZERTY (France and Belgium) keyboard layouts. The main swaps are A↔Q and W↔Z. Shows what would come out typing the same text on the other layout, useful when using a keyboard set differently than expected.

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Walsh-Hadamard Transform

Compute the Walsh-Hadamard Transform of a vector whose length is a power of two, and its inverse. It uses only additions and subtractions with the Hadamard matrix (natural ordering), a discrete analogue of the Fourier transform used in signal processing and coding.

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NYSIIS Phonetic Algorithm

Generate the NYSIIS (New York State Identification and Intelligence System) phonetic code of a name, grouping names that sound alike in English. More accurate than Soundex by handling digraphs and letter patterns. Used in similarity search and record deduplication.

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QWERTY ↔ QWERTZ Keyboard Converter

Convert text between the QWERTY and QWERTZ (Germany, Switzerland and Central Europe) keyboard layouts. The main difference is swapping Y and Z, since Z is far more frequent in German. Shows what would come out typing the same text on the other layout.

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QWERTY ↔ Workman Keyboard Converter

Convert text between the QWERTY and Workman keyboard layouts. Workman is an optimized layout that distributes the load according to each finger's natural reach, an alternative to Dvorak and Colemak. Shows what would come out typing the same text on the same physical keys.

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Adjacency Matrix ↔ Adjacency List

Convert a graph's representation between an adjacency matrix (a grid of 0s and 1s) and an adjacency list (each vertex with its neighbors), both ways. The two forms are equivalent, but each is more efficient for different graph-algorithm operations.

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Prüfer Sequence ↔ Tree

Convert between a labeled tree and its Prüfer sequence, a unique encoding of length n−2. It demonstrates Cayley's formula (nⁿ⁻² labeled trees) and is used to generate random trees. Converts both ways.

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Graph Incidence Matrix

Build the incidence matrix of an undirected graph from its edge list: a vertices × edges grid where each column marks with 1 the two vertices that edge connects. A representation useful in the linear algebra of graphs and in network theory.

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Graph Complement

Compute the complement of a simple graph: the one where two vertices are connected exactly when they are NOT connected in the original. Enter the number of vertices and the edges, and see the complement's edges. A graph joined with its complement is the complete graph.

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Binary Search Tree Traversals

Insert a sequence of numbers into a binary search tree (BST) and show the three classic traversals: in-order (which comes out sorted), pre-order and post-order. Demonstrates how traversal defines the output in tree structures.

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Prefix Trie (Autocomplete)

Insert a list of words into a prefix tree (trie) and list all those starting with a given prefix — the mechanism behind autocomplete. The trie shares the words' common prefixes, making prefix search very efficient.

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Music Transposer (Notes and Chords)

Transpose a sequence of notes or chords by a number of semitones to change a song's key while keeping the relations between notes. For example, transposing C E G by +2 semitones gives D F# A. Accepts sharps and flats.

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Clock Roman Numerals (IIII)

Convert the hours 1 to 12 to Roman numerals as they appear on clock faces, where four is traditionally written IIII instead of IV — a horological convention for visual symmetry. Also shows the standard IV form for comparison.