Developer tools
JSON, Base64, regex, colors and more.
Available tools
JSON Formatter Pretty-print, minify and validate JSON with precise error messages. On-device Base64 Encode / Decode UTF-8 safe Base64 with URL-safe variant, both directions. On-device URL Encode / Decode Percent-encoding in component or full-URL mode. On-device Code Beautifier Prettier in your browser for JS, TS, CSS, HTML, JSON, Markdown, YAML. On-device Regex Tester Live highlighting, groups, flags and replace preview. On-device Unix Timestamp Converter Epoch seconds/milliseconds to dates in any time zone, and back. On-device Color Picker & Palette HEX, RGB, HSL, OKLCH conversions, contrast checks and harmonies. On-device Markdown Editor Split-pane editing, sanitised preview, HTML export, local autosave. On-device UUID Generator v4 (random) and v7 (time-ordered), in bulk, from Web Crypto. On-device Hash Generator SHA-256/384/512 and SHA-1 for text or files, computed locally. On-device JWT Decoder Header, payload and expiry status, without sending the token anywhere. On-device