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Security and Data Tools

JWT Decoder

Inspect JWT headers and payloads without verification.

Browser workspace

JWT Decoder

⌘ / Ctrl + Enter to run
ImportantDecoded tokens are not verified. Do not treat decoded data as trusted.
Privacy-first processing

Your data stays private. All processing happens locally in your browser. Nothing is uploaded to our servers.

Built for real work

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.

Common use cases

Inspect claims while debugging authentication

Review a sample token structure

Example

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJkZW1vLXVzZXIiLCJyb2xlIjoicmVhZGVyIn0.c2FtcGxlLXNpZ25hdHVyZQ

Frequently 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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