JWT Decoder

Decode and analyze JSON Web Tokens (JWT). Parse headers, payloads, and view claims in a formatted display.

💡 Tips

  • JWT tokens consist of three Base64URL-encoded parts: header.payload.signature
  • This tool only decodes the token - it doesn't verify the signature
  • Never share JWTs containing sensitive information
  • Check expiration times (exp claim) to ensure token validity
  • Common algorithms include HS256, RS256, and ES256
  • The signature part cannot be decoded as it's encrypted/signed data
Privacy Notice:

Processing is ephemeral. Your files are handled in-memory and never stored or retained on the server. They are discarded immediately after the operation finishes.