JWT Generator — Generate Signed JWT Tokens Free Online
Generate signed JWT tokens with custom header and payload. HMAC-SHA256 signing in your browser. Free JWT generator — no sign-up, no upload.
Fill in the header, payload, and secret, then click Generate JWT.
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What is JWT Generator — Generate JWT Tokens Free Online?
A JWT generator creates signed JSON Web Tokens (JWTs) with a custom header, payload, and HMAC-SHA256 signature. JWTs are used for authentication and authorization in web APIs — they allow servers to verify a client's identity without storing session data. Our tool creates standard HS256-signed tokens entirely in your browser, useful for API testing, development, and learning JWT structure.
How to Use JWT Generator — Generate JWT Tokens Free Online
- 1Enter your HMAC secret key in the Secret field.
- 2Edit the payload JSON to include your desired claims (sub, iat, exp, etc.).
- 3The signed JWT token is generated instantly.
- 4Copy the token and use it in your API Authorization header.
- 5Verify the token using the JWT Decoder tool.
Key Features
- HMAC-SHA256 (HS256) JWT signing
- Custom header and payload JSON
- Auto-sets iat (issued at) timestamp
- Instant token generation
- Runs entirely in your browser — secret never sent to server
Benefits
- Generate test JWT tokens for API development
- Learn JWT structure by building tokens manually
- Create tokens for integration testing without a backend
- Verify JWT signing behavior with custom payloads
Why Use Irreva for JWT Generator — Generate JWT Tokens Free Online?
Generate test JWT tokens for API development
Learn JWT structure by building tokens manually
Create tokens for integration testing without a backend
Runs 100% in your browser — files never leave your device.
No account, no sign-up, no subscription — free forever.
Works on any device: desktop, tablet, or mobile.