Does decoding a JWT verify its signature?

No. Decoding inspects the readable Base64Url payload. Verifying the signature requires the secret key or public certificate on the backend server.

Is my token secure when using this tool?

Yes, 100%. All decoding occurs client-side in your local browser sandbox; no tokens are ever transmitted across the network.

JWT Decoder

Try the free JWT Decoder tool in the Encoding category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.

Input

Output

What is a JWT (JSON Web Token) Decoder?

A JSON Web Token (JWT) is an open industry standard (RFC 7519) for securely transmitting information between parties as a compact, self-contained JSON object.

A JWT consists of three dot-separated Base64Url parts: Header (algorithm & token type), Payload (user claims, expiration, roles), and Signature (tamper verification).

This tool safely parses and decodes the Header and Payload directly inside your browser without sending your token or sensitive authentication claims to any server.

How to Use

Paste your JWT token string into the input container.
The decoded Header and Payload JSON structures are rendered instantly.
Examine key claims like 'exp' (expiry time), 'sub' (subject), and custom roles.
Use 'Copy' to copy formatted JSON claims.

FAQ

Does decoding a JWT verify its signature?: No. Decoding inspects the readable Base64Url payload. Verifying the signature requires the secret key or public certificate on the backend server.
Is my token secure when using this tool?: Yes, 100%. All decoding occurs client-side in your local browser sandbox; no tokens are ever transmitted across the network.

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