JWT RSA (RS256) Key Pair & JWKS Generator
Generate 2048/4096-bit RSA public/private keys and JSON Web Key Sets (JWKS) via Web Crypto API.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
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.
How to Use JWT RSA (RS256) Key Pair & JWKS Generator
Choose 2048-bit (standard) or 4096-bit (high security).
Generate cryptographically secure RSA keys via Web Crypto.
Copy or download public.pem, private.pem, and jwks.json.
Frequently Asked Questions
Are generated private keys secure?
Yes, keys are generated locally inside your browser's Web Crypto Subtle sandbox and are never transmitted over any network.
Can I use the JWKS format for OAuth2 servers?
Yes, the output provides standard RFC 7517 JWKS JSON format ready for /.well-known/jwks.json endpoints.
Related Security & Network Tools
View all →Split master passwords into M-of-N threshold shares with GF(256) math.
Generate cryptographically secure 12, 18, or 24-word seed phrases.
Calculate network address, broadcast, usable host IP range, and masks.
Derive secure keys with customizable iterations, salts, and SHA hashes.