About JWT Generator
JWT Generator is a client-side tool to create and sign JSON Web Tokens with custom header algorithms (HS256, HS384, HS512), payload claims, and secret keys.
Key Capabilities & Features
✓
Sign tokens using HS256, HS384, or HS512 HMAC algorithms
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Customize header and payload JSON claims (sub, exp, iat, custom claims)
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Executes entirely client-side using Web Cryptography APIs
How to Use JWT Generator
- 01
Set payload claims
Enter claims JSON into the payload editor.
- 02
Enter secret key & algorithm
Choose signature algorithm and provide a signing secret.
- 03
Generate & copy JWT
Copy the signed encoded JWT string.
100% In-Browser Privacy Guarantee
All operations in JWT Generator run locally in your web browser using HTML5, Web Cryptography, and WebAssembly APIs. Your text, files, credentials, and code never leave your computer.
Frequently Asked Questions
Are my secret keys sent to a server?
No. JWT generation uses the browser Web Cryptography API. Secrets never leave your device.