JWT Decoder

Decode and inspect the header and payload of any JSON Web Token (JWT) instantly. 100% client-side — your tokens never leave your browser. See claims, algorithm and expiry.

This tool only decodes tokens — it does not verify signatures. Never paste production secrets.

Related tools

JSON Formatter & Validator
Format, beautify & validate JSON
Base64 Encode / Decode
Encode or decode Base64 text & files
URL Encoder / Decoder
Percent-encode or decode URLs
HTML Entity Encoder / Decoder
Escape & unescape HTML