JWT Decoder
Decode and inspect JWT tokens without sending data.
Decoded JWT parts will appear here.
About this tool
JSON Web Tokens (JWT) are widely used for authentication and secure data exchange. This decoder splits the header, payload, and signature of any JWT so you can inspect its claims, algorithm, and expiration — entirely offline in your browser.
How to use the JWT Decoder
- Paste your JWT token into the input field
- The header and payload decode automatically and are shown formatted
- Inspect iss, exp, sub, and any custom claims
- Signature is shown for reference (verification requires the secret or public key)
Features
- Decode JWT headers and payloads instantly
- Pretty-printed JSON views
- Supports HS256, RS256, ES256, PS256
- No token data sent to any server
- Client-side processing only
Frequently asked questions
Is this JWT decoder free?
Yes. Decode JWT tokens instantly without sending any data to a server.
Can this tool validate JWT signatures?
No. This decoder only reads the header and payload. Signature verification requires the secret key, which we never ask for.
Is it safe to paste a JWT here?
Yes. The JWT is decoded entirely in your browser. It never leaves your machine.
What information can I see in a decoded JWT?
You can see the algorithm, token type, issuer, audience, expiration time, and all custom claims in the payload.