RSA Key Generator
RSA is one of the most widely used public-key cryptosystems, essential for secure communications, digital signatures, and SSH access. This tool generates a matched public/private key pair using the browser's built-in Web Crypto API. Choose your key size and hash algorithm, then copy or download the PEM-formatted keys. Everything runs locally — your keys never leave your device.
Processed on your deviceNo signup required100% free
Standard
RSA-OAEP with public exponent 65537
No keys generated yet
Choose your key size and hash algorithm, then click Generate Keys to create an RSA key pair
How to Use
- Select the key size (2048, 3072, or 4096 bits) and hash algorithm.
- Click Generate to create a new RSA key pair.
- Copy or download the Public Key for sharing with others.
- Copy or download the Private Key and keep it secure — never share it.
- Use the keys with SSH, TLS, JWK, or any RSA-compatible tool.
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Frequently Asked Questions
What key size should I choose?
2048-bit is the minimum recommended for security. 3072-bit provides extra protection, and 4096-bit is the strongest option. Larger keys are slower to generate and use but provide more security.
What is the difference between the public and private key?
The public key can be shared freely and is used to encrypt data or verify signatures. The private key must be kept secret and is used to decrypt data or create signatures.
Are these keys secure?
Yes. RSA keys are generated using the browser's cryptographically secure random number generator (Web Crypto API), which uses the same entropy sources as your operating system.
Can I use these keys for SSH?
These keys are in PKCS#8/SPKI PEM format, which is compatible with most SSH implementations. You may need to convert the format depending on your SSH client.