RSA Key Pair Generator — Public & Private Key PEM
Generate secure 2048 or 4096-bit RSA key pairs entirely in your browser via the WebCrypto API
Creates RSA public/private key pairs in PEM format using the browser's built-in WebCrypto API — no server round-trip, so your private key never leaves your machine.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Choose a key size (2048 or 4096 bit).
- Click Generate and copy the PEM-formatted public and private keys.
FAQ
- Does the generated private key get sent to a server?
- Never. It's generated entirely inside your browser's WebCrypto engine and never leaves your device.
- Should I pick 2048-bit or 4096-bit?
- 2048-bit is plenty secure for most web certificates and SSH keys. Choose 4096-bit for long-term document signing or higher-security use cases, even though key generation takes a bit longer.
- Does the key disappear if I close the tab?
- Yes — nothing is saved. Copy and store the keys somewhere safe before you navigate away or refresh.