RSA Key Pair Generator — Public & Private Keys

Generate RSA public and private key pairs in standard PEM format (PKCS#8). Choose 2048-bit or 4096-bit key size for JWT RS256 signing, SSH authentication, TLS/SSL certificates, and file encryption. Keys are generated in your browser using the Web Crypto API — private keys never leave your machine.

RSA Key Pair Generator: Select a key size (2048 or 4096 bits) and click generate. Download the public and private keys in PEM format. Use them for SSH, TLS certificates, JWT signing, or file encryption.

RSA Key Pair Generator

Generate secure RSA Public and Private keys locally.

Public Key (Shareable)

Private Key (Keep Secret)

Client-Side Security

Keys are generated using the native Web Crypto API in your browser. They never leave your device.

OpenSSL Compatible

Generated keys use standard PEM format (PKCS#1 / PKCS#8) compatible with OpenSSL, SSH, and most servers.

Industry Standard

Use 2048-bit for standard security or 4096-bit for long-term data protection.

Key Takeaways

Generates RSA key pairs in standard PEM format
Supports 2048-bit and 4096-bit key sizes
2048-bit is the minimum recommended for security in 2026
4096-bit provides stronger security but slower operations
Keys are generated in your browser — private key never leaves your machine

What is RSA Key Pair Generator?

RSA Key Pair Generator — An RSA Key Generator is a free tool that creates RSA public/private key pairs in PEM format for use in encryption, digital signatures, and SSH authentication.

Generate RSA public and private key pairs online with this free tool. Create 2048-bit or 4096-bit RSA keys in standard PEM format (PKCS#8) for JWT RS256/RS512 signing, SSH authentication, TLS/SSL certificate generation, S/MIME email encryption, and file encryption. The public key encrypts data and verifies signatures; the private key decrypts data and creates signatures. Both keys are generated entirely in your browser using the Web Crypto API — the private key is never transmitted to any server. Copy or download keys directly for use in Node.js, Python, Java, Go, or OpenSSL workflows.

How to Use RSA Key Pair Generator

1
Select key size: 2048-bit (standard) or 4096-bit (higher security, slower operations).
2
Click Generate to create the RSA key pair in PEM format.
3
Copy the public key for sharing and the private key for secure storage.
4
Use the keys in your JWT signing, SSH config, TLS setup, or encryption workflow.

Key Features

2048-bit and 4096-bit RSA key pair generation

Standard PEM format output (PKCS#8) compatible with OpenSSL

Separate public key (SPKI) and private key (PKCS#8) display

Browser-based generation via Web Crypto API — private key never leaves your device

One-click copy for quick integration into code, configs, and .pem files

Use Cases

Generating RSA keys for JWT RS256 token signing in authentication systems

Creating SSH key pairs for server access and Git authentication

Generating test certificates for TLS/SSL development and staging environments

Testing RSA encryption and decryption across Node.js, Python, and Java implementations

About RSA Key Pair Generator

RSA (Rivest–Shamir–Adleman) is the most widely deployed public-key cryptosystem, used for digital signatures, key exchange, and encryption. The security of RSA relies on the mathematical difficulty of factoring large prime numbers. A 2048-bit RSA key has ~112 bits of security strength, while 4096-bit provides ~140 bits — both are considered safe through 2030+ by NIST guidelines.

For production use, store private keys in hardware security modules (HSMs), cloud KMS services (AWS KMS, Google Cloud KMS, Azure Key Vault), or encrypted key stores. Never commit private keys to source code repositories. Rotate keys according to your organization’s security policy — typically every 1–2 years for signing keys.

Frequently Asked Questions

Should I use 2048-bit or 4096-bit RSA keys?: 2048-bit is the minimum recommended by NIST in 2026 and sufficient for most applications. Use 4096-bit for high-security requirements, long-lived certificates, or when compliance policy requires it. 4096-bit keys are ~4x slower for signing operations.
Can I use these RSA keys for JWT signing (RS256)?: Yes. Copy the private key to sign JWTs with RS256, RS384, or RS512 algorithms. Share the public key with services that need to verify the tokens. Standard PEM format works with jsonwebtoken (Node.js), PyJWT (Python), and all major JWT libraries.
Is it safe to generate RSA keys in a browser?: Yes for development and testing. The Web Crypto API provides cryptographically secure key generation. For production keys protecting sensitive data or infrastructure, use dedicated tools like OpenSSL or cloud HSM services.
What is the difference between RSA and Ed25519?: RSA is older and more widely supported. Ed25519 (elliptic curve) is newer, faster, and provides equivalent security with much smaller keys (256-bit vs 2048-bit). Ed25519 is now preferred for SSH keys; RSA remains standard for TLS and JWT.
Why does my private key fail to import in my application?: Common causes: wrong key format (PKCS#1 vs PKCS#8), missing BEGIN/END markers, line break differences (CRLF vs LF), or algorithm mismatch (expecting EC key but getting RSA). Check your library’s expected format.
How should I store RSA private keys in production?: Use a secrets manager (AWS Secrets Manager, HashiCorp Vault), cloud KMS, or HSM. Never commit private keys to Git repositories. For application configs, use environment variables or encrypted config files with restricted file permissions (chmod 600).

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RSA Key Pair Generator — Public & Private Keys

Frequently Asked Questions

Should I use 2048-bit or 4096-bit RSA keys?

2048-bit is the minimum recommended by NIST in 2026 and sufficient for most applications. Use 4096-bit for high-security requirements, long-lived certificates, or when compliance policy requires it. 4096-bit keys are ~4x slower for signing operations.

Can I use these RSA keys for JWT signing (RS256)?

Yes. Copy the private key to sign JWTs with RS256, RS384, or RS512 algorithms. Share the public key with services that need to verify the tokens. Standard PEM format works with jsonwebtoken (Node.js), PyJWT (Python), and all major JWT libraries.

Is it safe to generate RSA keys in a browser?

Yes for development and testing. The Web Crypto API provides cryptographically secure key generation. For production keys protecting sensitive data or infrastructure, use dedicated tools like OpenSSL or cloud HSM services.

What is the difference between RSA and Ed25519?

RSA is older and more widely supported. Ed25519 (elliptic curve) is newer, faster, and provides equivalent security with much smaller keys (256-bit vs 2048-bit). Ed25519 is now preferred for SSH keys; RSA remains standard for TLS and JWT.

Why does my private key fail to import in my application?

Common causes: wrong key format (PKCS#1 vs PKCS#8), missing BEGIN/END markers, line break differences (CRLF vs LF), or algorithm mismatch (expecting EC key but getting RSA). Check your library’s expected format.

How should I store RSA private keys in production?

Use a secrets manager (AWS Secrets Manager, HashiCorp Vault), cloud KMS, or HSM. Never commit private keys to Git repositories. For application configs, use environment variables or encrypted config files with restricted file permissions (chmod 600).

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RSA Key Pair Generator — Public & Private Keys

Key Takeaways

What is RSA Key Pair Generator?

How to Use RSA Key Pair Generator

Key Features

Use Cases

About RSA Key Pair Generator

Frequently Asked Questions

RSA Key Pair Generator — Public & Private Keys

Key Takeaways

What is RSA Key Pair Generator?

How to Use RSA Key Pair Generator

Key Features

Use Cases

About RSA Key Pair Generator

Frequently Asked Questions