Developer · runs in your browser
JWT Decoder
Decode a JSON Web Token's header and payload, inspect standard claims and optionally verify an HS256 signature.
- Supported formats
- JWT
- Max file size
- Max No limit
- Speed
- Instant
- Free
- Free, no sign-up
Paste a token to inspect it
Header, payload, expiry and signature verification — all client-side.
- exp / iat / nbf
- HS256 verify
- No network calls
Private by design. This tool runs entirely inside your browser — your files are never uploaded, stored or seen by anyone, including us.