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RSA Key Generator

The RSA Key Generator creates a 2048 or 4096-bit RSA key pair in PEM format using the browser's native Web Crypto API. Keys are generated on your own device with no network request, so the private key is never exposed to a server.

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What does an RSA key generator create?

An RSA key generator creates a mathematically linked public and private key. The public key can be shared for the supported operation, while the private key must remain secret. This page exports 2048- or 4096-bit keys as PEM-encoded SPKI and PKCS#8 files for development and compatible cryptographic workflows.

Generation uses crypto.subtle.generateKey with RSA-OAEP, SHA-256, public exponent 65537, and encrypt/decrypt usages entirely on the device. A generated key is not a certificate and has no identity attached to it. Store the private key securely and confirm that the target system expects RSA-OAEP rather than a signing algorithm.