JWT Decoder

Decode and inspect JSON Web Tokens (JWT) instantly in your browser. This tool parses the header, payload, and signature, displays formatted JSON, and shows expiration status and common claims. No data is sent to any server -- everything runs client-side.

How to Use This Tool

  1. Paste a JWT token into the input area.
  2. The header, payload, and signature are decoded and displayed automatically in real time.
  3. Review token claims including expiration status, issued-at time, and other standard fields.
  4. Use the Copy buttons to copy the decoded header or payload JSON.

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