JWT Encoder

Create and encode JSON Web Tokens (JWT) with custom headers and payloads. Generate signed tokens for your applications.

Quick Add Common Claims:

Keep this secret secure. It's used to sign your token.

💡 Tips

  • • JWT consists of three parts: Header, Payload, and Signature
  • • Use strong, unique secrets for production tokens
  • • Include expiration times (exp claim) for security
  • • HS256 provides actual HMAC-SHA256 signatures in this tool
  • • HS384/HS512 show placeholder signatures (for demonstration only)
  • • Never expose your secret key - this tool runs entirely in your browser
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.