Does this tool verify JWT signatures?

No. This tool only decodes JWT header and payload for inspection. It does not verify the token signature.

Is my token sent to a server?

No. Decoding happens entirely in your browser using client-side JavaScript.

The tool shows a clear error message if token format, Base64URL data, or JSON parsing fails.

Decode JSON Web Tokens in your browser without sending data to a server. View header, payload, and readable token timestamps instantly.

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Paste JWT

{}

{}

Issued At (iat): —

Expiration (exp): —

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No. It only decodes the token parts. Signature validation is not performed.

Yes, decoding happens in your browser (client-side only). Nothing is posted to a backend by this tool.

A JWT with three dot-separated parts: header.payload.signature. The signature is ignored for decode output.

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