Developer Tools
Free in-browser developer tools: JSON formatter, Base64, URL and HTML encoding, UUIDs, hashes, JWT decoder, regex tester, timestamps, minifiers and cron.
JSON Formatter & ValidatorPretty-print, minify and validate JSON with error lines.
JSON ↔ CSV ConverterConvert JSON arrays to CSV and CSV back to JSON.
Base64 Encode / DecodeUTF-8 safe Base64 and Base64URL for text.
URL Encode / DecodePercent-encode text or decode URLs; inspect query strings.
HTML Entity Encode / DecodeEscape < > & " ' or decode entities like ©.
UUID GeneratorRandom v4 or time-ordered v7 UUIDs, in bulk.
Hash GeneratorMD5, SHA-1, SHA-256, SHA-384 and SHA-512 of any text.
JWT DecoderDecode JWT header and payload; see expiry times.
Regex TesterTest JavaScript regular expressions with live highlighting.
Unix Timestamp ConverterEpoch seconds/milliseconds ↔ human dates in any zone.
Color Picker & ConverterHEX ↔ RGB ↔ HSL ↔ CMYK, with contrast checker.
HTML MinifierStrip comments and whitespace from HTML.
CSS MinifierCompress CSS: comments, whitespace, zero units, short hex.
JavaScript MinifierMinify and mangle JS with Terser, right in the browser.
Markdown to HTMLLive Markdown preview and clean HTML output.
Cron Expression ExplainerCron schedule in plain English + next run times.