A free, no-signup JWT (JSON Web Token) decoder and encoder. Paste a token to read its header and payload, see whether it has expired, and verify its signature with an HMAC secret or a public key (HS256/384/512, RS256/384/512, PS256/384/512, ES256/384/512, with a PEM public key or a JWK / JWKS). Or build a token yourself: write the header and payload, pick an algorithm and key, and get a signed JWT.
Everything runs in your browser using the Web Crypto API. Your tokens, secrets and private keys are never uploaded or stored. Still, avoid pasting production secrets on any website you do not trust.
JWT Decoder & Encoder is built and maintained by RTSoftwares. We build small, free, no-signup web tools that run entirely in your browser.