Generate cryptographic 256/384/512-bit signing secrets via Web Crypto CSPRNG.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Choose 256-bit (32B), 384-bit (48B), or 512-bit (64B).
Click regenerate to sample fresh CSPRNG entropy.
Copy Base64URL or Hex secret for your .env configuration.
Keys are generated in local browser RAM using window.crypto.getRandomValues() CSPRNG.
OWASP recommends a minimum of 256-bit (32 bytes) for HS256 and 512-bit (64 bytes) for HS512.
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