Essential developer utilities — JSON formatter, Base64, regex tester, hash generator and more. All free, all browser-based.
Format, validate and beautify JSON data with syntax highlighting.
Encode text to Base64 or decode Base64 strings instantly.
Test regular expressions with real-time matching and highlighting.
Decode and inspect JSON Web Tokens. View header, payload and signature.
Build and explain cron expressions with an interactive visual editor.
Generate MD5, SHA-1, SHA-256 and other hash values from text or files.
Encode and decode URLs and query parameters correctly.
Convert colors between HEX, RGB, HSL and other formats.
Write and preview Markdown in real-time with a live editor.
Escape or unescape HTML entities for safe embedding.
Generate random UUID/GUID values (v4) instantly.