Encoded JWT
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JWT Decoder (Offline & Secure)
Free online JWT decoder — paste any JSON Web Token to decode header, payload, and signature. Auto-converts exp/iat timestamps to readable dates. 100% client-side.
How to use JWT Decoder
- Paste a standard JWT string (starting with 'eyJ...') into the left input area.
- The token is automatically split into Header, Payload, and Signature sections.
- Timestamp claims like 'exp', 'iat', and 'nbf' are automatically converted to human-readable ISO dates.
- Click 'Copy' on any section to copy the decoded JSON to your clipboard.
Edge Cases & Important Considerations
- Only standard 3-part JWTs (header.payload.signature) are supported.
- Encrypted JWTs (JWE) cannot be decoded without the encryption key.
- The signature is displayed raw — this tool does not verify signatures.
Keyboard Shortcuts
- Ctrl/Cmd + K — Open Command Palette to switch tools instantly.
Frequently Asked Questions
Is this JWT Decoder safe for sensitive corporate data?
Yes, 100%. All processing runs client-side in your local browser memory. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine.
Can I use this tool offline?
Yes. Because this tool runs strictly on client-side JavaScript with zero external API dependencies, once loaded it functions completely offline.
100% Client-Side Privacy Guarantee
All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.