JWT Generator
11 toolsSign a JWT with HS256 directly in your browser.
Runs in your browser — your files and text stay on your device
A complete kit of everyday developer utilities — generators, parsers, and quick references — all running client-side, with nothing to install.
UUID GeneratorCron ParserHTTP Status Codes.gitignore GeneratorMeta Tag GeneratorUser-Agent ParserCurl Command BuilderCode FormatterFake Data GeneratorPlaceholder ImageJWT Generator
How to use this tool
- 1Edit the JSON payload (header is fixed to HS256/JWT).
- 2Enter a secret key.
- 3Click Generate JWT and copy the signed token.
Frequently asked questions
Is my secret sent to a server?
No — signing uses the browser's built-in Web Crypto API entirely locally.
Does this support RS256 or other algorithms?
No, only HS256 (HMAC-SHA256), the most common algorithm for single-service signing.
Is this safe to use for production secrets?
The math is correct, but avoid pasting real production secrets into any browser tool — use a real secret only in a trusted, offline context.