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JWT Decoder

Decode JWT headers and payloads locally without uploading tokens.

Local decode only. Signatures are not verified.

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Frequently Asked Questions

Does my JWT get uploaded?

No. The token is decoded locally in your browser. The tool does not send the JWT, header, payload, or claims to any server.

Does this verify the token signature?

No. JWT Decoder only Base64URL-decodes the header and payload so you can inspect their JSON content. It does not validate the signature, issuer, audience, expiry, or revocation status.

When should I use this tool?

Use it to debug authentication flows, inspect claims during local development, compare environments, or confirm what an identity provider placed in a token. Do not treat decoded output as proof that a token is trusted.