JWT Decoder

A JSON Web Token is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three Base64url-encoded parts separated by dots: a header describing the algorithm, a payload containing claims, and a cryptographic signature.

Paste your JWT token into the input area and the tool will instantly decode it. The header, payload, and signature are displayed in separate panels with formatted JSON and human-readable claim labels.

This tool decodes and inspects JWT tokens but does not verify signatures. Signature verification requires the secret key or public key used to sign the token, which should never be shared with online tools.

Yes! All processing happens entirely in your browser. Your token data is never sent to any server. No data is collected, stored, or transmitted. You can safely decode tokens containing sensitive claims.

The tool recognizes all standard registered claims including iss (issuer), sub (subject), aud (audience), exp (expiration time), nbf (not before), iat (issued at), and jti (JWT ID). It also displays any custom claims present in the payload.