Essential, privacy-first developer utilities processed 100% in your browser. Zero cloud transmission.
Safely decode JWT tokens offline in your browser. View algorithm, headers, payload claims, and expiration dates with zero server transmission.
Prettify, format, validate, minify, and auto-repair broken JSON syntax with real-time error detection and 1-click copy.
Convert JSON arrays and files to CSV format in your browser with live tabular data preview and custom delimiter settings.
Convert CSV spreadsheets and text into structured JSON arrays and objects instantly on your device with 100% privacy.
Encode text and files (images, audio, PDF) to Base64 Data URLs, or decode Base64 strings back to readable text and downloadable files.
Convert Unix epoch timestamps in seconds and milliseconds to human-readable dates and vice versa with live epoch clock.
Generate bulk RFC 4122 v4 UUIDs / GUIDs instantly in your browser with uppercase, hyphens, and braces options, plus UUID syntax validator.