Free Online JWT Decoder & Generator (No Signup) – FreeWWW

Free Online JWT Decoder & Generator - No Signup

Decode, inspect, verify, and generate JSON Web Tokens (JWTs) instantly. This tool runs entirely in your browser - no data is sent to any server. Supports HMAC signature verification (HS256, HS384, HS512).

Security Note: All processing happens locally in your browser. Never share tokens containing sensitive data. For production tokens, always verify signatures server-side.
📥 Token Input
📋 Header
📦 Payload
📊 Token Analysis
Algorithm
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Type
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Issued At (iat)
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Expires (exp)
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Not Before (nbf)
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Token Status
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📝 Templates
Basic Token
Simple token with sub and name claims
Auth Token
User authentication with roles
API Token
API access with scopes
Refresh Token
Long-lived refresh token
🔧 Header
HS256HMAC
HMAC + SHA-256
HS384HMAC
HMAC + SHA-384
HS512HMAC
HMAC + SHA-512
none
Unsigned
🔐 Secret Key
📦 Payload Claims
🎫 Generated Token
🎫 Token to Verify
🔐 Secret / Public Key
✓ Verification Result
Algorithm
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Signature
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Expiration
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Overall
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📦 Decoded Payload
📋 Token History

Recently decoded and generated tokens are saved locally. Click to load.

No tokens in history yet.

🔄 Base64URL Encode
🔄 Base64URL Decode
⏱ Unix Timestamp Converter

📚 JWT Claim Reference
iss (Issuer)
Identifies the principal that issued the JWT
sub (Subject)
Identifies the subject of the JWT
aud (Audience)
Identifies the recipients of the JWT
exp (Expiration)
Unix timestamp after which JWT is invalid
nbf (Not Before)
Unix timestamp before which JWT is invalid
iat (Issued At)
Unix timestamp when JWT was issued
jti (JWT ID)
Unique identifier for the JWT
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