Free JWT Decoder Online
Decode and inspect JSON Web Tokens. View header, payload, claims and expiry status instantly in your browser.
Key Features
Everything you need to inspect JWT tokens
Paste any JWT token and see the decoded header and payload immediately with no button press needed.
Automatically checks the exp claim and shows a clear valid or expired badge so you know token status at a glance.
All decoding runs in your browser. Your tokens never leave your device and are not sent to any server.
About This Tool
This free JWT decoder lets you paste any JSON Web Token and instantly see the decoded header, payload and signature. All claims are displayed in a formatted table including timestamps converted to human-readable dates.
Frequently Asked Questions
Is this tool completely free?
Yes. The tool is 100% free to use with no registration, no subscription and no usage limits.
You can use it as many times as you need for personal or commercial projects without any cost.
We believe developer tools should be accessible to everyone without paywalls.
Is my JWT token safe to paste here?
Yes. All processing happens locally in your browser using JavaScript. No data is transmitted to our servers.
Your tokens are never stored, logged or sent anywhere. The decoding happens entirely on your device.
You should still avoid pasting production tokens containing sensitive information into any online tool out of good security practice.
Does this tool verify the JWT signature?
No. This tool only decodes the base64url-encoded parts of the JWT. It does not verify the HMAC or RSA signature.
Signature verification requires knowledge of the secret key or public key which should never be shared with a browser tool.
If you need to verify a signature, use a server-side library in your backend code.
What is a JWT token?
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three base64url-encoded parts separated by dots: header, payload and signature.
The header specifies the algorithm used. The payload contains claims such as the subject, issued-at time and expiry. The signature ensures the token has not been tampered with.
JWTs are widely used in authentication and authorization flows in modern web applications and APIs.