Sign JWT tokens instantly with our free online tool. Customize header and payload with syntax highlighting and validation. No installation required.
Our JWT signer helps you create JWT tokens by signing your custom headers and payloads. Perfect for testing authentication systems or generating tokens for development. The signing happens entirely in your browser, ensuring your data stays private and secure.
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. It's commonly used for authentication and information exchange.
Enter your payload data in JSON format, select your preferred signing algorithm, provide a secret key, and click 'Sign'. The tool will generate a signed JWT token instantly.
We support common JWT signing algorithms including HS256, HS384, and HS512 for HMAC-based signatures, and RS256, RS384, and RS512 for RSA-based signatures.
Yes, all JWT operations are performed locally in your browser. Your keys and data never leave your device.
Common claims include 'sub' (subject), 'iat' (issued at), 'exp' (expiration), and 'iss' (issuer). You can add any custom claims as needed for your application.