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JWT Decoder

Paste a JWT to see the decoded header and payload (pretty-printed JSON), plus expiry status. Browser-only — your token never leaves your device.

100% in your browser. Files never uploaded.

How to use

  1. 1
    Paste a JWT
    Three dot-separated Base64URL parts.
  2. 2
    Read the decoded header and payload
    Pretty-printed JSON. Expiry is highlighted if present.
  3. 3
    Copy any section
    One click per section.

FAQ

Is the token uploaded?
No. JWT decoding happens entirely in your browser using the native atob/TextDecoder. The token never leaves your device — important since JWTs often carry session credentials.
Does it verify the signature?
No — V1 only decodes. Signature verification requires the secret or public key, which is sensitive enough to merit its own tool. On the roadmap.

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