Generate cryptographically secure RSA and ECDSA key pairs instantly using native Web Crypto.
Public-key cryptography uses mathematically related pairs of keys: a public key that can be freely shared, and a private key that must remain secret. RSA and ECDSA are the two most widely used asymmetric algorithms. RSA keys are based on the difficulty of factoring large prime numbers, while ECDSA leverages elliptic curves to achieve equivalent security with much shorter key lengths. Our tool generates these key pairs using the Web Crypto API built into your browser, ensuring private keys are created locally and never exposed to any external server.
Generating key pairs typically requires command-line tools like OpenSSL or SSH-keygen, which can be complex for beginners. Our browser-based tool provides instant key generation with a clean interface, outputting keys in industry-standard PEM format for SSH configurations, TLS certificates, JWT signing, and code signing workflows. Because the Web Crypto API is a native browser feature, the cryptographic operations meet professional security standards.
RSA has been the industry standard for decades and is supported by virtually every system. However, RSA requires longer key lengths: a 2048-bit RSA key provides roughly the same security as a 256-bit ECDSA key. ECDSA offers faster key generation, smaller key sizes, and faster signature operations. For new projects, ECDSA is generally recommended unless you need compatibility with older systems that only support RSA.
For RSA, 2048 bits is the minimum recommended by NIST. For higher security requirements, use 4096 bits. Keys below 2048 bits are considered insecure.
The generated keys are in PEM format, which can be converted for SSH use. For direct SSH key generation, ssh-keygen is typically more convenient. Our tool is better suited for TLS certificates, JWT signing, and testing purposes.
Private keys should be stored securely using a password manager or encrypted vault. Set restrictive file permissions (chmod 600 on Unix). Never commit private keys to version control.