RSA Key Generator

RSA Key Generator

RSA Key Generator is a free online tool that creates RSA public/private key pairs for encryption, signing, and authentication. Generate 2048 or 4096-bit keys in PEM format using the Web Crypto API. All key generation happens locally in your browser — your private keys never leave your device.

• Generate RSA 2048 and 4096-bit key pairs
• Output in standard PEM format (PKCS#8 / SPKI)
• Uses Web Crypto API for secure key generation
• Copy public and private keys to clipboard
• Download keys as .pem files
• All processing happens locally — keys never leave your browser
• No signup or installation required

How to Use the RSA Key Generator

1. 1

   Choose key size

   Select 2048 bits (faster, standard security) or 4096 bits (higher security, slower generation).

2. 2

   Generate the key pair

   Click the generate button. Key generation may take a few seconds depending on the key size.

3. 3

   Copy or download

   Copy the public and private keys to your clipboard, or download them as .pem files.

4. 4

   Keep your private key safe

   Store the private key securely. Never share it publicly or commit it to version control.

Frequently Asked Questions

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