JWT Encoder / Decoder

Securely encode and decode JSON Web Tokens in your browser. Fast, free, and private.

🔓 Decode a JWT

Paste your JWT token to instantly decode and view the Header and Payload. No server communication.

🔐 Encode a JWT

Enter custom Header, Payload, and Secret to generate a signed JWT using HS256.

Why Use This Tool?

  • ✅ 100% client-side: Nothing is sent to a server.
  • ✅ Open-source: Built with the secure jose library.
  • ✅ Developer friendly: Great for learning, debugging, and testing JWT-based systems.

Example JWT

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.L7RBBoQ4Jx59NTeRduLG2MRTI4RbdEo9ps2QpJctdSc