JWT Decoder

Decode the header and payload of any JWT, with registered claims explained and expiry times shown in plain language. HS256, HS384 and HS512 signatures can be verified against a secret — all of it in your browser, with nothing sent anywhere.

Token

Verify signature

Shared secret

Secret is base64-encoded

Enter the secret to check whether the signature matches.

The token and secret stay in this tab. Even so, avoid pasting production credentials into any online decoder.

No token yet

Paste a JSON Web Token to see its header, claims and expiry. Decoding happens entirely in your browser.

How to use JWT Decoder

Paste a token — the header and payload decode immediately.
Standard claims are explained, and timestamps become readable dates.
A badge shows whether the token is active, expired or not yet valid.
Add the shared secret to verify an HS256, HS384 or HS512 signature.

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