RSA Keypair Generator
Generate 2048-bit or 4096-bit RSA public and private keypairs client-side using Web Crypto API.
RSA Keypair Generator
About RSA Keypair Generator
The RSA Asymmetric Public/Private Keypair Generator creates cryptographic RSA keys (2048-bit, 3072-bit, 4096-bit) and ECC (Elliptic Curve P-256 / P-384) keypairs in PKCS#8 and SPKI PEM formats using 100% in-browser Web Crypto API.
How to Use RSA Keypair Generator
Step 1
Select key algorithm (RSA or Elliptic Curve) and modulus bit length (e.g. 2048 or 4096).
Step 2
Select cryptographic purpose (Encryption / Decryption or Digital Signing).
Step 3
Click "Generate Keypair".
Step 4
Copy or download the public and private PEM files.
Practical Use Cases for RSA Keypair Generator
SSH & Server Access Keypair Creation
Generate secure asymmetric keypairs for SSH server authentication and Git commit signing without command-line dependencies.
End-to-End Encrypted Messaging (E2EE)
Create public encryption keys and private decryption keys for client-side encrypted messaging protocols.
Input & Output Examples
Generating 2048-Bit RSA Keypair
Algorithm: RSA-OAEP, Key Size: 2048 bits, Hash: SHA-256
Public Key: -----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A...\n-----END PUBLIC KEY-----\nPrivate Key: -----BEGIN PRIVATE KEY-----\nMIIEvgIBADANBgkqhkiG9w0BAQEFAASC...
Key Features & Performance
- ✓Supports RSA (2048-bit, 3072-bit, 4096-bit) and ECDSA / ECDH (P-256, P-384, P-521).
- ✓Exports PKCS#8 PEM Private Keys and SPKI PEM Public Keys.
- ✓Uses cryptographically secure hardware-seeded random number generators (CSPRNG).
- ✓100% Client-Side Web Crypto API execution guarantees private key secrecy.
- ✓1-Click Copy and 1-Click `.pem` file downloads.
Key Terminology & Definitions
RSA (Rivest-Shamir-Adleman)
One of the first public-key cryptosystems, widely used for secure data transmission and digital signatures.
PKCS#8 PEM Format
The standard syntax for storing private key information, wrapped in `-----BEGIN PRIVATE KEY-----` headers.