JWT Encoder (HS256)
Generate signed JWT tokens online from payload JSON and secret key.
About This Tool
This free online JWT Encoder creates signed HS256 tokens directly in your browser for API testing, auth development, and integration debugging. Enter payload JSON and a secret key to generate a valid token string that you can paste into Postman, curl, or application configs. It is useful when you need fast token generation without external platforms.
Simple mode keeps setup minimal and uses a standard JWT header automatically. Advanced mode lets you customize header fields while enforcing HS256 signing for consistency. Input data and secrets are processed in-browser and not stored on IO Tools servers.