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JWT Decoder
Decode · Inspect · Validate JWT Tokens

Free online JWT decoder. Decode and inspect JWT token header, payload and signature. Check token expiry status instantly in your browser. No login required.

✓ Free Forever ✓ No Login ✓ 100% Client-Side ✓ No Data Sent ✓ Mobile Friendly
🔐 JWT DECODER Decode · Inspect · Validate JWT Tokens
JWT Token

Header
Payload
Signature
Frequently Asked Questions
What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication. It has 3 parts: header, payload, and signature separated by dots.
Does ByteKit verify the signature?
No — signature verification requires the secret key. ByteKit only decodes and displays the token contents without verification.
Is it safe to paste my JWT here?
Yes — decoding happens entirely in your browser. Your token is never sent to any server.
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