Online JWT (JSON Web Token) decoder with HS256 signature verification. View Header, Payload, and Signature segments. Decoded locally in your browser, token never sent to server.
TL;DR: Free online JWT decoder with HS256 signature verification. View Header, Payload, and Signature segments. Token is decoded locally in your browser, never sent to any server.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
FAQ
Completely free, no login required. Just paste your JWT in the browser to decode it — all operations run locally with no usage limits.
Yes. It supports HS256 signature verification — enter your secret key to check if the JWT has been tampered with. Verification runs locally in your browser; the key is never uploaded.
No. JWT decoding runs entirely in your browser. Neither the token nor the secret key is sent to any server. Note that JWT Payload is Base64-encoded, not encrypted — do not put sensitive data in it.
A JWT consists of Header (algorithm and type), Payload (claims data), and Signature, separated by dots. This tool parses and highlights each segment individually.
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