JWT tools

Inspect, verify, and generate JSON Web Tokens without ever sending a live token or secret to a server.

JWT Decoder & Debugger Online — Free & Private
Decode any JWT's header and payload, check exp/iat/nbf expiry, and verify HS256 signatures — 100% in your browser, tokens never uploaded.
JWT Generator Online — HS256, Free & Private
Generate signed HS256 JWTs in seconds — set issuer, subject, audience, expiry, and custom claims. Signing happens in your browser; nothing is sent.