JWT Decoder Online Free
Paste a JSON Web Token to inspect header and payload claims, check expiration at a glance, and verify HMAC or RSA signatures — decode, verify, and sign test tokens in one workbench without sending tokens to a server.
Utiliio vs JWT.io — Decode, Verify & Sign Tokens PrivatelyEverything runs in your browser. Your input is never uploaded, stored, or logged on our servers.
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Read guideFrequently asked questions
How do I decode a JWT online for free?+
Paste the token into the Decode tab — header and payload appear as formatted JSON instantly with a claims table and expiry badge.
Can this tool verify JWT signatures?+
Yes. Open the Verify tab. For HS256/384/512, paste the HMAC secret. For RS256/384/512, paste the PEM public key (SPKI format). Verification runs locally via Web Crypto.
Does this tool sign JWTs?+
Yes. Use the Sign tab to build and sign test tokens with HS256, HS384, or HS512. For production auth, always sign tokens on your server.
Is this tool free?+
Yes. Every Utiliio utility is free with no sign-up, usage limits, or paywalls.
Do you store my data?+
No. Processing happens entirely in your browser. Your input never leaves your device.
Can I use this tool offline?+
Yes. Once the page loads, most tools continue working without an internet connection.