>_freedevelopertoolsTools

All Developer Tools

Every tool runs client-side in your browser — nothing you paste is uploaded to a server.

Text & Data Tools

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 back to plain text, instantly in your browser. Supports UTF-8 input.

JSON Formatter

Format, beautify and validate JSON instantly in your browser. Paste minified JSON and get clean, indented output with error line numbers.

Security Tools

JWT Decoder

Decode JSON Web Tokens to inspect the header and payload instantly in your browser. See claims like expiry and issuer without a server call.

Encoding & Hashing

Password Generator

Create strong, random passwords with custom length and character sets. Generated locally in your browser using cryptographically secure randomness.

UUID Generator

Generate RFC 4122 version 4 UUIDs in bulk, free and instantly in your browser. Copy single IDs or export a batch as a list.