Developer Tools
JWT Generator
Generate signed JWT tokens with HS256, HS384, or HS512. Add custom claims, set expiry, copy the token. Free, in-browser.
Keep your secret secure. Never use real production secrets in online tools. This tool runs entirely in your browser — nothing is transmitted.
How to Generate a JWT Token (HS256/HS384/HS512) — No Library, No Server
JWT structure explained (header.payload.signature), HMAC vs RSA algorithms, standard claims (iss, sub, aud, iat, exp), and how to generate tokens without a server.