JSON and YAML formatters, regex testers, hash generators, JWT decoders and other utilities that keep you out of a scratch file.
25 of 25 tools
Format, validate and minify JSON, with errors that point to the exact line.
Test regular expressions live, with highlighted matches and capture groups.
Encode text to Base64, including full Unicode and URL-safe output.
Turn CSV into JSON, with quoted fields and embedded commas handled properly.
Decode Base64 back to readable text, with clear errors when it is not valid.
Explain a cron expression in plain English and see exactly when it will next run.
Turn JSON into readable YAML, with quoting and multiline strings handled properly.
Escape text for HTML, or turn entities back into readable characters.
Generate version 4 and version 7 UUIDs in bulk, using secure randomness.
Pick a colour and get HEX, RGB and HSL values with contrast checking.
Create QR codes for URLs, text, WiFi and contact details, and download as PNG or SVG.
Turn a JSON array of objects into CSV, with correct escaping.
Indent and validate XML, with clear messages when tags do not match.
Tidy YAML indentation, validate structure and convert between YAML and JSON.
Format SQL queries across dialects, with consistent keyword casing and indentation.
Convert HEX colour codes to RGB and HSL, including alpha values.
Convert RGB and RGBA colour values into HEX codes.
Create linear and radial CSS gradients visually and copy the code.
Generate secure random strings, passwords and API keys with entropy shown.
Build CSS box shadows visually and copy the generated code.
Generate placeholder text by paragraphs, sentences, words or list items.
Format JavaScript and TypeScript with the same rules your editor uses.
Indent messy HTML into readable, consistently structured markup.
Format and tidy CSS, SCSS and Less with consistent spacing and indentation.
Generate Code 128 barcodes as scalable SVG, ready for labels and print.
Create strong random passwords with full control over length and characters.
Work out any percentage — of a number, as a share, or as a change.
Count words, characters, sentences and paragraphs as you type.
Find the mean, median, mode and range of a list of numbers, with the working shown.
Sample and population standard deviation and variance, both shown, with the working.
Turn a logo into favicon.ico, the PNG sizes a site needs, and the HTML to declare them.