Signing happens in your browser with the Web Crypto API. Don't paste production secrets into any website you don't trust.
Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the JWT Encoder & Signer
Create an HMAC-signed JWT from JSON payload data and a supplied secret.
- 1 Select HS256, HS384 or HS512 and enter a valid JSON payload.
- 2 Use the iat and exp helpers if appropriate, then enter a test secret and indicate whether it is Base64 encoded.
- 3 Copy Signed token and inspect it in your test environment.
Example and practical tips
Create a token with a fictional subject and short expiry for a local authentication test.
Frequently asked questions
Does this support RSA or elliptic-curve signing?
The available controls support the listed HMAC algorithms. They do not provide asymmetric-key signing.
Should I use a production signing key here?
Use test secrets. A live signing key grants significant authority and should stay within your controlled signing infrastructure.
Practical guides
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How to Use JWT Encoder & Signer
Create and sign JSON Web Tokens online with HS256, HS384 or HS512. Enter a JSON payload and secret to get a signed JWT. Free JWT generator for testing.
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