DevTools Online

Free online developer tools — JSON formatter, Base64 decoder, UUID generator, and more

B64

Base64 Decoder & Encoder

Decode and encode Base64 strings online. Free, fast, and privacy-friendly — all processing in your browser.

 { }

JSON Formatter & Beautifier

Format, beautify, and validate JSON data online. Free, fast, and privacy-friendly — no data sent to servers.

 ID

UUID v4 Generator

Generate random UUID v4 identifiers instantly. Free, fast, and works offline — RFC 4122 compliant.