Werkery

JWT Decoder

Paste a JSON Web Token to decode its header and payload. Read claims, expiry, issuer, audience. 100% client-side — your token never leaves your browser.

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How it works

  1. 1
    Paste JWT
    The whole eyJ... string.
  2. 2
    Read claims
    Header + payload decoded.

Frequently asked

Does this verify the signature?

No. Decoding is reading; verifying requires the secret/public key. Most leaked-token incidents come from people pasting tokens into untrustworthy tools — we run entirely in your browser, but you should still rotate any token you paste into anyone else's tool.

What's in a JWT?

Three Base64URL parts joined by dots: header (algorithm), payload (claims like sub, iat, exp), signature. Header + payload are visible; signature is the cryptographic seal.

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Tool designed and editorially reviewed by Felix Brübach. Text drafted with AI assistance and reviewed for legal and factual accuracy before publication. Not legal advice — for complex cases, consult a lawyer.
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