Is my private key sent to any server?

No. Key generation runs entirely in your browser using the Web Crypto API (SubtleCrypto). The keys are never transmitted anywhere — they exist only in your browser memory until you copy or download them.

What key size should I use?

2048 bits is the industry standard and recommended for most use cases. Use 4096 bits when you need long-term security or handling very sensitive data. Avoid 1024 bits — it is considered cryptographically weak.

Can I use these keys with OpenSSL?

Yes. The exported PEM format is fully compatible with OpenSSL. You can verify the private key with: openssl rsa -in private.pem -check -noout

Why does generation take a few seconds for large keys?

4096-bit RSA key generation requires significant computation — even on modern hardware it can take 1–5 seconds. 2048-bit keys generate almost instantly.

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RSA Key Pair Generator

Generate RSA public and private key pairs in PEM format directly in your browser. Choose 1024, 2048 or 4096-bit key sizes. No data leaves your device.

🔒 Security Tools Free Browser-based

Tool

Key Size

Hash Algorithm

RSA Key Pairs

RSA is an asymmetric encryption algorithm used for secure data transmission, digital signatures and authentication. A key pair consists of a private key (kept secret) and a public key (shared freely). Data encrypted with the public key can only be decrypted by the private key, and vice versa.

Key Size Comparison

Size	Security Level	Speed	Recommended Use
1024 bits	Weak (deprecated)	Fast	Legacy systems only
2048 bits	Strong	Good	General purpose, TLS, SSH
4096 bits	Very strong	Slower	High-security, long-lived keys

Key Formats

Private keys are exported in PKCS#8 PEM format (-----BEGIN PRIVATE KEY-----). Public keys are exported in SPKI PEM format (-----BEGIN PUBLIC KEY-----). Both are widely compatible with OpenSSL, Node.js and most programming languages.

RSA Key Pair Generator

RSA Key Pairs

Key Size Comparison

Key Formats

Frequently Asked Questions