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RSA Key Generator

Generate an RSA key pair in your browser and export both keys as PEM text.

Generate an RSA key pair

Status: idle
Key: —
Private PEM size: —
Generation uses crypto.subtle.generateKey and exportKey; private keys are exported as PKCS#8 and public keys as SPKI. Nothing is uploaded.

How to use the RSA Key Generator

  1. Choose the key size and the RSA algorithm you need.
  2. Click Generate key pair and wait for the browser to finish the maths.
  3. Copy each PEM block, or save both keys to a single text file.

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Frequently Asked Questions

Common questions about the free online rsa key generator.

Pick the key size and algorithm, click Generate key pair, then copy or download the PEM blocks. Everything happens inside your browser.
You can generate keys for RSASSA-PKCS1-v1_5 signatures or RSA-OAEP encryption, with a SHA-256, SHA-384 or SHA-512 digest.
2048 bits is the safe minimum for most uses. Choose 4096 bits when you want a longer security margin, and expect it to take a little longer.
PRIVATE KEY marks a PKCS#8 private key and PUBLIC KEY marks an SPKI public key, both base64 encoded between header and footer lines.
Not directly. OpenSSH wants its own key format, so convert with ssh-keygen, or use these keys with TLS, JWT signing or encryption code.
No. The key pair is created with the Web Crypto API in your browser and is never transmitted or stored on a server.
Large prime numbers for a 4096 bit key take real computation. The browser does the work on your device, so the time depends on your hardware.
Keep it in a file only you can read, never in a public repository. Encrypt it at rest and rotate it if it may have been exposed.
No. Every run uses fresh randomness, so you get a brand new key pair each time you click the button.
Yes, although 4096 bit generation can be slow on older phones. A 2048 bit key is usually quick on any modern device.

Last updated: October 10, 2026