Which RSA key size should I choose?
2048 bits remains widely supported, while 3072 bits provides a larger security margin at the cost of slower operations.
Security
RSA Key Generator
Generate RSA public and private keys with configurable modulus length and export format.
Tool
RSA Key Generator
Generate RSA public and private keys with configurable modulus length and export format.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this RSA key generator for signing, verification, encryption tests and certificate workflows. Choose the modulus length and export format while keeping the private key inside your browser session.
Examples
- Generate a 2048-bit RSA key
- Generate a 3072-bit RSA key
- Export RSA keys as PEM
Frequently Asked Questions
Can RSA generation take time?
Yes. Larger RSA keys require more computation and may take longer to generate in the browser.
Can the same RSA key be used for every purpose?
It is better to use separate keys for different applications and to follow the requirements of the relevant protocol.
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