🔄Converters
Converters turn data from one format into another — units of measure, number bases, colors, dates, currencies, JSON, CSV, YAML and more. They are the right tool when you have information in one format and need it in another, with nothing to install and no loss of precision.
165 tools
CIDR to Wildcard Mask Converter
Convert a CIDR mask (/n) into a wildcard mask, the format used in Cisco router ACLs. An essential tool for network administration and configuration.
Fresh to Dry Yeast Converter
Convert the amount of baking yeast between fresh and dry in your bread recipes. Get the rise right even when swapping the type of yeast you have on hand.
Butter to Oil Converter
Convert butter to oil (and back) in your recipes, adjusting the amount in the right ratio. Adapt cakes and dishes to the ingredient you have at home.
Egg Substitute Calculator
Find what to replace eggs with in vegan recipes (flax, applesauce, banana, aquafaba) and the right amount of each. Bake cakes and desserts without eggs.
Electron-volt to Joule Converter
Convert energy between electron-volts (eV) and joules (J) instantly. Essential in particle physics, chemistry and electronics for atomic-scale work.
Binary ↔ Hexadecimal Converter
Convert numbers between binary and hexadecimal without going through decimal. Shows nibble (4-bit) grouping.
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.
Degrees ↔ Radians (with table)
Convert angles between degrees and radians. Includes a table of common values (0, 30, 45, 60, 90, 180, 270, 360).
CSS px ↔ rem Converter
Convert between px and rem in CSS with a configurable root font base (default 16px). Essential for responsive, accessible layouts with scalable typography.
CSS px to em Converter
Converts pixels to em and back against the parent font size, 16px by default: 24px is 1.5em. Unlike rem, the base is the parent element, not :root.
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.
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 → 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).
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.
Beaufort to km/h Converter
Convert wind force on the Beaufort scale (0 to 12) to the equivalent speed in km/h, with a description of each level. Useful for sailing, fishing and weather.
YAML to TOML Converter
Convert config files from YAML to TOML right in your browser, preserving strings, numbers and booleans. Handy for migrating configs between formats.
TOML to YAML Converter
Convert config files from TOML to YAML right in your browser, preserving strings, numbers and booleans. Handy for migrating configs between formats.
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.
CSV to YAML List Converter
Convert a CSV with a header into a YAML list of objects, preserving numbers and booleans. Useful for building config files and fixtures from spreadsheets.
JSON ↔ XML Converter
Convert between JSON and XML preserving attributes via @attr and text via #text, with pretty-print of the resulting XML.
Markdown ↔ WhatsApp Formatter
Converts Markdown into WhatsApp formatting (*bold*, _italic_, ~strikethrough~) and back, keeping lists, links and code blocks intact.
Excel Formula Translator (PT ↔ EN)
Translates Excel formulas between English and Portuguese function names, error values and argument separators, leaving strings and refs intact.
Brazilian Address Parser
Splits pasted Brazilian addresses into street, number, unit, neighborhood, city, state and postal code fields, with CSV and JSON export.
Fixed-Width ↔ CSV/JSON Converter
Converts fixed-width text files to CSV, TSV or JSON and back, with automatic column detection, a position map and per-line warnings.
Markdown ↔ Jira/Confluence Converter
Converts text between Markdown and Jira/Confluence wiki markup — headings, lists, tables, links, quotes and code blocks — in both directions.
cURL → PowerShell / wget Converter
Converts cURL commands into PowerShell Invoke-RestMethod, Invoke-WebRequest or wget, preserving method, headers, body, auth and redirects.
CSV ↔ vCard (.vcf) Batch Converter
Converts a CSV contact list into a multi-contact vCard (.vcf) file and back to CSV, with column mapping and vCard 3.0/4.0 output.
BR ↔ US Number Format Converter
Converts numbers in bulk between Brazilian (1.234,56) and US (1,234.56) formats, auto-detecting the decimal separator line by line.
CSV Diff by Key Column
Compares two CSV files by a key column and lists added, removed and changed rows, pointing out exactly which columns differ.
In-Text Unit Converter (Imperial ↔ Metric)
Rewrites every measurement inside a block of text between imperial and metric units, handling fractions, inches, pounds, cups and Fahrenheit.
Six-Frame Translation and ORF Finder
Translate a DNA sequence in all six reading frames and list the ORFs, with the position on the strand, length in amino acids and the predicted protein.