JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and signature instantly in your browser. No data leaves your device.
Runs locally — nothing is uploaded
How to use
- 1
Paste your JWT
Paste a JSON Web Token into the input field. The tool decodes header and payload instantly as you type.
- 2
Inspect claims
View formatted JSON for the header and payload. Time claims like exp, iat, and nbf show human-readable dates.
- 3
Copy sections
Use Copy header or Copy payload to grab decoded JSON. The signature is shown as raw text only.
Frequently Asked Questions
No. It only decodes the header and payload locally in your browser. Your token is never sent to a server.
exp, iat, and nbf show human-readable dates. Past exp values get an expired badge — that reflects the timestamp only, not signature verification.
JWTs use Base64URL encoding (not standard Base64). Dashes and underscores replace plus and slash, and padding may be omitted.
If the exp (expiration) claim is in the past, the tool labels it expired. That does not mean the token was verified — only that the timestamp has passed.
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