Free online developer tools
Handy utilities for developers: format and validate JSON, encode and decode Base64 and more. Fast, private and free.
JSON Formatter & Validator
Beautify, validate and minify JSON.
Base64 Encode / Decode
Encode and decode Base64 text and files.
JWT Decoder
Read JWT header, payload and expiry.
Hash Generator
MD5, SHA-1, SHA-256, SHA-512 checksums.
Unix Timestamp Converter
Epoch time ↔ human-readable date.
Regex Tester
Live regex matching with groups & replace.
UUID Generator
Random v4 and time-ordered v7 UUIDs.
Color Contrast Checker
Test text colors for accessibility.
YAML to JSON Converter
Convert YAML ⇄ JSON instantly.
CSV to JSON Converter
Convert CSV ⇄ JSON in your browser.
JS, CSS & HTML Minifier
Shrink JS, CSS and HTML files.
URL Encode & Decode
Percent-encode or decode URLs.
HTML Entity Encoder & Decoder
Escape and unescape HTML entities.
Markdown to HTML Converter
Markdown editor with live HTML.
Cron Expression Generator
Build and explain cron schedules.
CSS Gradient Generator
Design gradients and copy the CSS.
CSS Box Shadow Generator
Design box-shadow CSS visually.
Color Converter (HEX, RGB, HSL, CMYK)
HEX ⇄ RGB ⇄ HSL ⇄ CMYK.