What this tool is good for
This tool generates a fresh RSA key pair entirely in the browser. The output includes an X.509 PEM public key and a PEM private key that can optionally be password-protected before export.
It is useful for testing, local development, certificate experiments, and interoperability work where you need a quick RSA key pair without sending key material to a server.
How to use it
- Choose a key size such as 2048 or 4096 bits.
- Optionally enter a password if you want the generated private key to be encrypted.
- Generate the key pair, then copy the PEM blocks or download them as a ZIP archive.
Practical notes
- 2048-bit RSA is a common baseline for general compatibility.
- Larger keys improve security margins but take longer to generate.
- If you set a private-key password, keep it safe or the private key cannot be used later.
Related tools
- RSA Encryption & Decryption：Encrypt and decrypt short text with RSA in your browser
- RSA Sign & Verify：Create and verify RSA signatures online
- RSA Private Key Password：Add, change, or remove RSA private key passwords