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Security and Data Tools
JWT Decoder
Inspect JWT headers and payloads without verification.
Browser workspace
⌘ / Ctrl + Enter to runJWT Decoder
ImportantDecoded tokens are not verified. Do not treat decoded data as trusted.
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Privacy-first processing
Your data stays private. All processing happens locally in your browser. Nothing is uploaded to our servers.
Why use JWT Decoder?
Decode the three sections of a JSON Web Token locally for inspection. This tool does not verify signatures or trustworthiness.
Header and payload formatting
Signature section display
No verification claim or token persistence
How to use it
- 1
Paste a three-part JWT.
- 2
Select Decode JWT.
- 3
Inspect the sections while treating all decoded values as untrusted.
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Common use cases
Review a sample token structure
Example
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJkZW1vLXVzZXIiLCJyb2xlIjoicmVhZGVyIn0.c2FtcGxlLXNpZ25hdHVyZQFrequently asked questions
Does this tool verify JWT signatures?
No. It only decodes token sections; it never establishes authenticity or trust.
Is JWT Decoder free?
Yes. JWT Decoder is free to use and requires no account.
Does JWT Decoder upload my token?
No. The processing in this tool runs in your browser and does not send the token to our servers.
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