Decode and inspect JWT tokens online for free. View header, payload, and signature claims with expiration validation. No signup required.
First time here? Paste your JWT token into the input Your input is processed locally and disappears when you close the tab.
JSON Web Tokens carry the identity and permissions behind almost every modern login, and reading them by hand is nearly impossible. Our free JWT Decoder is a complete jwt decoder online that instantly splits any token into its header, payload, and signature and, unlike a basic viewer, can cryptographically verify the signature so you know whether a token can be trusted.
As a full json web token decoder, it renders every claim in a clean, copyable layout and translates the registered claims (iss, sub, aud, jti, iat, nbf, and exp) into human-readable timestamps with relative labels like expires in two hours, doubling as a handy jwt expiration checker. Use it as a jwt token parser while debugging auth flows, then verify the signature: paste your HMAC secret for HS256/384/512 tokens, or a PEM public key or JWK for RS, ES, and PS algorithms, and the built-in jwt claims viewer confirms whether the signature matches and whether a time-based claim has failed.
Security matters here, so the tool is deliberately 100% client-side: your token, secret, and keys are processed in your browser with the Web Crypto API and never touch a server. Combine it with our Base64 Encoder & Decoder to inspect token segments, format payloads with the JSON Formatter, handle token transport with the URL Encoder & Decoder, or generate digests using the SHA-256 Hash Generator.
Paste your JWT token into the input
View the decoded header and payload
Check expiration and other claims
Copy individual sections as needed