Generate secure RSA public and private key pairs instantly with our free online tool. Create encryption keys directly in your browser with complete privacy - no data is ever sent to our servers or stored anywhere. Perfect for developers, security professionals, and anyone needing cryptographic key pairs for secure communications.
An RSA key pair consists of two mathematically related keys: a public key and a private key. The public key can be freely shared and is used to encrypt data, while the private key must be kept secret and is used to decrypt data. This asymmetric encryption system is fundamental to modern digital security, used in SSL/TLS certificates, SSH connections, email encryption, and digital signatures.
Select Key Size: Choose between 2048-bit (recommended for most uses), 3072-bit, or 4096-bit (maximum security) encryption strength
Choose Output Format: Select your preferred key format - PEM (most common), PKCS#1, or PKCS#8
Generate Keys: Click the "Generate Key Pair" button to create your keys instantly
Copy Keys: Use the copy buttons to save your public and private keys separately
Important: Your private key should be stored securely and never shared. Anyone with access to your private key can decrypt messages intended for you.
Suitable for most applications including web servers, email encryption, and code signing
Fast generation and processing
Meets current security standards and regulatory requirements
Expected to remain secure through 2030
Enhanced security for sensitive applications
Balanced performance and security
Recommended for long-term data protection
Maximum security for highly sensitive data
Slower generation and encryption/decryption processes
Recommended for critical infrastructure and top-secret communications
Future-proof security for decades
PEM (Privacy Enhanced Mail)
Most widely used format
Compatible with OpenSSL, SSH, and most web servers
Human-readable Base64 encoding
Standard format for SSL/TLS certificates
PKCS#1 (Public-Key Cryptography Standards #1)
RSA-specific format
Commonly used in legacy systems
Contains only RSA key data
PKCS#8 (Public-Key Cryptography Standards #8)
Algorithm-independent format
More flexible than PKCS#1
Supports encrypted private keys
Modern standard for key storage
SSL/TLS Certificates Generate key pairs for securing websites with HTTPS encryption. The public key goes into your certificate signing request (CSR), while the private key stays on your server.
SSH Authentication Create key pairs for secure, password-less authentication to remote servers. The public key is added to authorized_keys on the server.
Email Encryption (PGP/GPG) Encrypt email communications using your recipient's public key, which only they can decrypt with their private key.
Code Signing Sign software applications and scripts to verify authenticity and integrity. Users can verify signatures using your public key.
API Authentication Secure API communications using RSA key pairs for token signing and verification in OAuth and JWT implementations.
Digital Signatures Create unforgeable digital signatures for documents, contracts, and transactions that prove authenticity and non-repudiation.
Private Key Protection
Never share your private key with anyone
Store private keys in encrypted storage
Use strong passwords to protect key files
Regularly rotate keys for high-security applications
Delete old keys securely when no longer needed
Public Key Distribution
Freely share your public key
Verify key fingerprints when exchanging keys
Use trusted channels for initial key exchange
Maintain a key registry for organizational use
Key Management
Document which keys are used for what purposes
Set expiration dates for keys when possible
Keep backups of private keys in secure locations
Use hardware security modules (HSM) for critical keys
100% Client-Side Generation All key generation happens in your browser using the Web Crypto API. Your keys never touch our servers, ensuring complete privacy and security.
No Registration Required Generate unlimited key pairs instantly without creating an account or providing any personal information.
Cryptographically Secure Uses the browser's built-in Web Crypto API, which implements industry-standard cryptographic algorithms with proper random number generation.
Multiple Format Support Export keys in PEM, PKCS#1, or PKCS#8 formats to ensure compatibility with your applications and tools.
Instant Generation Keys are generated in seconds, even for 4096-bit encryption. No waiting, no queues.
Free Forever Our tool is completely free with no hidden costs, subscription fees, or usage limits.
Algorithm: RSA-OAEP (Optimal Asymmetric Encryption Padding)
Hash Function: SHA-256
Public Exponent: 65537 (standard)
Key Sizes: 2048, 3072, 4096 bits
Output Formats: PEM, PKCS#1, PKCS#8
Random Number Generation: Cryptographically secure PRNG via Web Crypto API
Yes. Modern browsers implement the Web Crypto API with cryptographically secure random number generation. Since generation happens entirely on your device, there's no transmission of sensitive data.
Yes, keys generated with our tool are cryptographically secure and suitable for production use. However, for high-security applications, consider generating keys in an air-gapped environment.
The public key is meant to be shared and is used to encrypt data. The private key must be kept secret and is used to decrypt data encrypted with the public key.
RSA keys don't expire inherently, but best practices recommend rotating them every 1-2 years for security. Some organizations require more frequent rotation.
No. If you lose your private key, it cannot be recovered. Any data encrypted with the corresponding public key will be permanently inaccessible.
or most applications, 2048-bit is sufficient and meets current security standards. Use 4096-bit for maximum security when protecting highly sensitive data.
bsolutely not. Key generation happens entirely in your browser. We never see, transmit, or store your keys in any way.
Yes. Keys generated in PEM format are fully compatible with OpenSSL and can be used for certificate generation, signing, and other OpenSSL operations.