JWT Builder

Build and sign JWT tokens from scratch with HMAC-SHA256 or create unsigned tokens

All processing happens in your browser. No data is uploaded.

Offline Ready

Build and sign JWT tokens from scratch with HMAC-SHA256 or create unsigned tokens

🔒All processing happens in your browser. No data is uploaded.

Build

Decode

Header

Algorithm

HS256 (HMAC-SHA256)

Header JSON

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

Add standard claim:

Payload JSON

{
  "sub": 1234567890,
  "name": "John Doe"
}

Secret Key

Token Preview (unsigned)

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOjEyMzQ1Njc4OTAsIm5hbWUiOiJKb2huIERvZSJ9

Click "Sign Token" to generate the signed JWT.