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Decode JWT header and payload locally, inspect claims, expiry times and raw Base64URL segments.
Runs locally in your browser by default — nothing is uploaded first.
Decoding always runs locally. If you enter an HMAC secret, the page can verify HS256 / HS384 / HS512 signatures in the browser.
Header, payload, and timing claims will appear here.
JWT Decoder runs locally in your browser by default, so you can work with the content without uploading it first.
Decode JWT header and payload locally to inspect claims, timestamps and Base64URL segments without sending the token away.
Does JWT Decoder run locally or in the cloud?
JWT Decoder runs locally in your browser by default, so you can work with the content without uploading it first.
What usually comes after JWT Decoder?
A common next step is to continue into related workflows such as Code and Data Formatting Tools.
Does decoding a JWT prove it is valid?
No. Decoding only reveals the header and payload. Validation requires signature, issuer, audience, time, and policy checks.
A practical explanation of JWT structure, claims, Base64URL encoding, signatures, and why decoding a token is not the same as trusting it.
Reading a JWT: What Decoding Shows and What It ProvesA JWT is three base64url segments, and decoding one tells you nothing about whether it is genuine. How to read the claims, and why tokens break in URLs.
collectionCode and Data Formatting ToolscollectionID, Password and Hash ToolscollectionCryptography and Security ToolsDecode JWT header and payload locally to inspect claims, timestamps and Base64URL segments without sending the token away.
