Everything you need to know about decoding and verifying JWT tokens online.
JWT (JSON Web Token) is an open standard for securely transmitting information between parties as a JSON object. It consists of three parts: header, payload, and signature, separated by dots.
Yes, completely. The JWT Decoder is 100% client-side. Your tokens never leave your browser and are never sent to any server. All decoding and verification happens locally in your browser memory.
Yes. Verify HMAC signatures (HS256, HS384, HS512) by entering your secret key, and RSA/EC signatures (RS256, ES256 etc.) by uploading a PEM public key.
The security audit checks 12 common JWT vulnerabilities including weak algorithms, missing expiry claims, use of the none algorithm, overly broad audiences, and other security misconfigurations.
All common JWT algorithms are supported including HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, and PS256.
The Token Playground lets you edit the header and payload of a decoded token and re-sign it with your secret key, making it easy to test different token configurations without writing code.
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Support GetPDFMintA JWT (JSON Web Token) is a compact, URL-safe token used for authentication and data exchange between parties. It consists of three Base64-encoded parts: a header, a payload, and a signature, separated by dots. JWTs are widely used in REST APIs, OAuth2 flows, and single sign-on systems.
Paste your JWT token into the decoder above. The tool instantly splits and decodes the header and payload, displaying the claims in readable JSON. No data is sent to any server — decoding happens entirely in your browser.
A JWT has three parts: the Header specifies the algorithm (e.g. HS256, RS256), the Payload contains claims like user ID, roles, and expiry (exp), and the Signature verifies the token hasn't been tampered with. Use this free JWT decoder to inspect tokens from any API or auth provider.