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JWT Decoder

Decode JWT header and payload in this tab. Tokens never leave this device. Signatures are not verified.

Processed in your browser

Decoding runs in this browser. We do not send tokens.
Decode-only. Signatures are not verified and tokens are never minted. Pasted tokens stay on this device.

Compact form header.payload.signature. A Bearer prefix is stripped automatically.

Paste a JWT, then decode.

Shown for inspection only — not verified.

Features

Header and payload

Expand Base64URL segments into pretty-printed JSON.

Decode-only

No signature verification and no token minting.

Time claim hints

Show exp / iat / nbf as UTC ISO timestamps when numeric.

Stays in the browser

Decoding runs on this device. Tokens are not uploaded.

How to use

  1. Paste a JWT into the input (optional Bearer prefix).
  2. Press Decode to show the header and payload as JSON.
  3. Copy any section you need. The signature is shown but not verified.

Why this tool

Runs in the browser

Core work finishes in this tab.

No upload

Pasted text and local files are not sent away for processing.

Free, no account

The core path has no signup wall.

Immediate

There is no upload-and-wait queue.

10 languages

The same tool ships in ten languages.

Readable failures

Broken input returns a reason, not a blank screen.

FAQ

Are tokens uploaded?
No. Decoding runs in this browser. Tokens are not sent.
Do you verify signatures?
No. This tool is decode-only; the signature segment is shown but not verified.
What happens on invalid input?
Empty input, wrong segment count, invalid Base64URL, or invalid JSON show a clear error.
Is it free? Do I need an account?
Yes, it is free. No account is required to decode or copy.

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