JWT Decoder

Inspect token header and payload.

Theme

Private by design: This tool runs in your browser — your data is not uploaded.

How to use JWT Decoder

Paste a JWT to inspect its header and payload JSON — useful for debugging auth tokens (signature not verified).

Step-by-step

  1. Paste a JWT (three dot-separated segments).
  2. Click Decode.
  3. Review formatted header and payload JSON.

Common questions

Does this verify the signature?
No. This tool only decodes Base64URL segments — it does not validate signatures.
Is my token sent online?
No. Decoding runs entirely in your browser.

Last updated: 2026-06-05