JWT Encoder / Generator
Build and sign a JWT with HS256/384/512.
Signs with HMAC (HS256/384/512) using the Web Crypto API. For RS/ES tokens you need a private key — generate those server-side.
🔒 Your token and secret never leave your browser — everything runs locally via the Web Crypto API.
🔒 Private by design: tokens, secrets, and keys are processed entirely in your browser with the Web Crypto API — nothing is sent to a server, stored, or logged. Even so, avoid pasting production secrets into any online tool.