🛠️Utilities
Utilities gather small everyday tools that do not fit a single box: counters, comparators, organizers, link builders and practical shortcuts. These are the quick tasks you would otherwise do by hand, here reduced to a single click.
125 tools
Color Shades Generator
Generate shades and tints of any color. Click to copy the HEX, RGB or HSL code. Perfect for design systems and UI development.
Color Blindness Simulator
See how an image appears to people with protanopia, deuteranopia, tritanopia or achromatopsia. Accessibility tool for designers and developers.
Image Compressor
Compress JPEG and PNG images directly in the browser using the Canvas API. Set the target quality (1–100%) and see the size reduction in real time. No files are uploaded to servers.
Reading Time Calculator
Estimate the reading time of any text based on words per minute (WPM). Useful for articles, posts and scripts. Also shows word count, characters and speaking time. Everything in your browser.
Mailto Link Generator
Generate mailto: links with recipient, subject, body, CC and BCC. Useful for "Send email" buttons on sites and signatures. Built-in copy and test. Everything in your browser.
IPv4 CIDR Range Expander
Expand IPv4 CIDR blocks (e.g. 192.168.0.0/24) into first IP, last IP, broadcast, mask and total usable hosts. Useful for network and firewall planning. Everything in your browser.
Phone Number Parser
Parse phone numbers — extract country code, area code and number, format in Brazilian style (+55 11 9XXXX-XXXX) and international E.164 (+5511...). Works with several formats. Everything in your browser.
Safelink Decoder
Decode URLs wrapped by SafeLinks (Outlook, AWS SES, Mandrill, SendGrid and similar). Reveals the real protected URL behind the wrapper. Everything in your browser.
UTM URL Builder
Add utm_source, utm_medium, utm_campaign, utm_term and utm_content to a URL. Ready for Google Analytics and GA4. Everything in your browser.
World Clock
Show current time in major world cities (São Paulo, New York, London, Tokyo, Sydney).
Tap Tempo BPM
Compute BPM by tapping (click or spacebar). Uses moving window of last 8 taps.
Online Metronome
Simple metronome 30-240 BPM with downbeat accent.
Diceware Passphrase Generator
Generate secure Diceware passphrases: N random words joined by hyphen.
Tel Link Builder
Build clickable tel: links from a phone number in the international E.164 format. Great for call buttons on mobile sites, email signatures and contact pages.
SMS Link Builder
Builds sms: links with phone number and optional message body, ready for mobile apps and pages.
Discord Invite Builder
Builds Discord invite URLs (discord.gg/CODE) from a valid invite code.
Spotify URI Builder
Builds spotify: URIs and https://open.spotify.com URLs from a type (track/album/playlist) and ID.
YouTube Embed Builder
Builds a YouTube embed <iframe> from the video ID with customizable width and height.
Twitch Embed Builder
Generate the embed code (iframe) for a Twitch player from the channel name and your site domain. Add live streams and VODs to your page in seconds.
Google Maps Embed Builder
Builds a simple <iframe> to embed Google Maps from an address or coordinates.
OpenStreetMap Embed Builder
Builds an OpenStreetMap <iframe> from a bounding box (lat/lng) and optional marker.
Iframe Builder
Builds a generic <iframe> with src, width, height and optional sandbox/allow attributes.
HTML Video Embed Builder
Builds an HTML5 <video> tag with source, controls, poster, autoplay and loop options.
Img Srcset Builder
Builds an <img> tag with a responsive srcset from URLs and widths, ideal for fluid images.
Picture Tag Builder
Builds a <picture> tag with multiple <source> (modern formats like webp, avif) and an <img> fallback.
HTML Form Builder
Builds a <form> with inputs from a list of name:type entries and configurable action/method.
HTML Rating Stars Builder
Builds a sequence of filled/empty stars representing a numeric rating from 0 to 5.
Shields.io Badge Builder
Builds a shields.io badge URL from label, message and color, ready to embed in READMEs.
Mini Pomodoro
A simple pomodoro pattern with 25-minute focus and 5-minute break cycles, explained for personal use.
Screen Color Eyedropper
Explains how to use the browser EyeDropper API to pick a color from any point on the screen.
HTML Toggle Switch Builder
Builds an iOS-style toggle switch with label using <input type=checkbox> and inline CSS.
Bookmarklet Builder
Wraps a JavaScript snippet as a bookmarklet (javascript: link) ready to drag to the bookmarks bar.
WCAG AA Contrast Ratio
Calculate the contrast ratio between two colors and see if it passes WCAG AA and AAA levels. Ensure readable, accessible text on your site with approved colors.
Additive Color Mixer (RGB Light Mixing)
Mixes two colors as light in RGB: it adds each channel and clamps at 255, returning the hex code of the result. Red plus green comes out yellow (#ffff00).
Subtractive Color Mixer (CMY, Hex Output)
Mixes two hex colors the way ink does, keeping the lowest R, G and B value of each pair, so yellow ffff00 with cyan 00ffff returns green 00ff00.
Beaufort Wind Scale Converter
Convert wind speed in km/h to the Beaufort scale, from 0 (calm) to 12 (hurricane), with a description of each level. Useful for sailing, fishing and weather.
Mohs Hardness Scale
Look up the Mohs hardness scale (1 to 10) and the reference mineral at each level, from talc to diamond. Useful for geology, jewelry and mineral study.
Body Temperature (Fever Check)
Sorts a body temperature in Celsius into hypothermia, normal, low-grade fever, fever or high fever, using the 35, 37.5, 38 and 39.5 degree cut-offs.
Blood Pressure Category Classifier
Enter systolic and diastolic in mmHg to get the ACC/AHA stage: hypotension under 90/60, normal, elevated, stage 1 at 130/80, crisis at 180/120.
Dog Food Portion Calculator
Work out how many grams of food your dog needs per day based on weight and size. Avoid overfeeding or underfeeding and keep your dog healthy.
Eisenhower Matrix Builder (4 Quadrants)
Paste one task per line as task;urgent;important with 1 or 0 flags, and read them sorted into do now, schedule, delegate and drop.
Intermittent Fasting Schedule
Build your intermittent fasting schedule (16:8, 18:6 or 20:4) with the eating and fasting window times. Know when to eat and when to stop each day.
Birthstone by Month
Discover your birthstone by month of birth and its meaning. Great for gifts, personalized jewelry and fun facts about each gem.
Birth Flower by Month
Discover the birth flower linked to your month of birth and its meaning. Perfect for gifts, tattoos and meaningful decoration.
Life Path Number Calculator
Discover your Life Path Number in numerology from your date of birth. Learn about your purpose, talents and personality challenges.
Destiny Number Calculator
Calculate your Destiny Number in numerology from the letters of your full name (Pythagorean method). Discover your talents, life mission and potential.
Boxing Weight Class Finder
Enter a fighter's weight in kilograms to see which professional boxing division it belongs to, from minimumweight at 47.6 kg all the way up to heavyweight.
Country Capital Lookup
Find the capital of any country in seconds. A handy tool for geography study, quizzes, schoolwork and fun facts about the world.
Recommended DNS TTL
Suggests a DNS TTL for five situations - stable record, migration, dynamic load balancer, failover and CDN - ranging from 86400s down to 30s, with the reason why.
Browser FPS Meter
Measure browser frames per second via requestAnimationFrame. Shows instant, average and min FPS over the last 5s.
Restaurant Bill Itemized
Each person picks the items they consumed; the system sums values, applies proportional service fee and shows each person's share.
Tip and Split Calculator
Compute tip (custom %), add to bill and split among N people. Shows per-person value before and after the tip.
Optimal Change Calculator
Given an amount in BRL, show the minimum combination of bills (200, 100, 50, 20, 10, 5, 2) and coins (1, 0.50, 0.25, 0.10, 0.05, 0.01) for change.
Side-by-Side Text Diff
Compare two texts in two columns, highlighting added, removed and modified lines. Visual diff based on a simplified Myers algorithm.
BOM Detector
Check whether an uploaded file starts with a Byte Order Mark (UTF-8, UTF-16-LE, UTF-16-BE, UTF-32). Useful for encoding issues.
Line Ending Detector (LF/CRLF/CR)
Detect whether a text uses LF (Unix), CRLF (Windows) or CR (classic Mac), and how many of each appear.
Strip BOM
Remove the Byte Order Mark (\uFEFF) from pasted text. Fixes common issues with Excel-generated CSVs.
Tweet Char Counter (280)
Count characters with Twitter/X rules: emojis and URLs (shortened to 23 chars). Shows remaining out of 280.
Cron → Natural Language
Translate cron expressions (* * * * *) into Portuguese natural language. Ex: '0 0 * * 1' = 'Every Monday at midnight'.
Natural Language → Cron
Build a cron expression from Portuguese selectors (every X minutes, every workday at H, Monday at H:M). Rule-based, no AI.