Local-first • No server upload
Developer

JWT Decoder

Inspect the readable header and payload of a JWT locally. — 100% browser-side, no server upload, works offline.

Developer utility

Decode a JWT

Local inspection

This tool decodes the visible header and payload only. It does not verify a signature or prove that a token is safe to use.

Common questions

Does decoding verify the JWT?

No. It only parses the visible header and payload; signature verification requires the issuer and the correct key.

Is the token uploaded?

No. JWT parsing happens locally in this browser.

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