JWT Decoder Online Free
Decode JSON Web Tokens online. View JWT header, payload, and signature.
Files never uploadedInstant results100% freeWorks on mobile
How to Use
- 1Paste your JWT token into the text area below.
- 2Click the "Decode" button to parse the token.
- 3View the decoded header, payload, and signature with copy buttons.
Frequently Asked Questions
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: header, payload, and signature, all base64url-encoded and separated by dots.
Can this tool verify or validate a JWT?
No. This tool only decodes the token for inspection. It does not verify the cryptographic signature or validate claims like expiration. For verification, use a JWT library with the original secret or public key.
Is my token data sent to a server?
No. All decoding happens entirely in your browser using the native atob() function. Your JWT token never leaves your device.
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