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JWT Decoder / Debugger
Developer

JWT Decoder / Debugger

100% local decoding. No token leaves your browser.

Data Source & Legal Disclaimer
Effective: Current
Sources: RFC 7519 — JSON Web Token (JWT)

⚠️ Decoding runs 100% locally in your browser — your JWT is never uploaded. Never paste production access tokens or sensitive credentials into any online tool. This decoder only reads the header and payload; it does NOT verify signatures and must not be used to trust token contents. Treat all decoded data as untrusted.

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About This Tool

Decode and debug JWT tokens locally in your browser — no upload, no server, no tracking. This free tool decodes the Header, Payload, and Signature, detects the algorithm (HS256, RS256, none), checks expiration, and shows all timestamps in human-readable format. 100% client-side — your tokens never leave your device. Perfect for developers debugging authentication.

100% localHS256/RS256Expire check📖 View Full Guide

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This tool is free, and always will be.

No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.

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100% of proceeds go towards hosting & building more free tools.