Free Online Developer Tools

Everyday utilities for developers, without pasting secrets into someone else’s server. Format and validate JSON, decode JWTs, encode Base64 and URLs, generate UUIDs and compute hashes — all locally in your browser.

JSON Formatter & Validator Format, beautify, validate and minify JSON online with syntax highlighting and clear error messages showing the line and column.Base64 Encoder & Decoder Encode text to Base64 or decode Base64 to text instantly.JWT Decoder Decode a JWT to see its header and payload, with expiry and issued-at times shown as readable dates.UUID Generator Generate random UUIDs (v4) or time-ordered UUIDs (v7) in bulk.Hash Generator Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files instantly.URL Encoder & Decoder Encode or decode URLs and query strings (percent-encoding) instantly, and break any URL into its protocol, host, path and query parameters.Color Converter Convert colors between HEX, RGB, HSL, HSV and CMYK instantly.