Is it safe to generate SSH keys online?

Yes, this tool is 100% safe because all key generation happens entirely in your browser using the Web Crypto API. Your private keys never leave your device and are never transmitted to any server. The source code is open source and auditable on GitHub.

What is the difference between Ed25519 and RSA?

Ed25519 is a modern elliptic curve algorithm that offers better security with smaller key sizes (256-bit vs 2048-4096-bit RSA). Ed25519 keys are faster to generate and use, and are recommended for most new SSH setups. RSA is older but has wider compatibility with legacy systems.

How do I add my SSH key to GitHub?

1) Generate your SSH key using this tool, 2) Copy the public key, 3) Go to GitHub Settings > SSH and GPG keys, 4) Click 'New SSH key', 5) Paste your public key and give it a title, 6) Click 'Add SSH key'. Test with: ssh -T git@github.com

What key size should I use for RSA?

For RSA keys, 4096-bit is recommended for maximum security. 2048-bit is the minimum acceptable size and offers adequate security for most purposes. Keys smaller than 2048-bit are considered insecure and should not be used.

Can I use this SSH key generator offline?

Yes! This SSH key generator is a Progressive Web App (PWA) that works offline. After your first visit, you can install it as an app on your device and generate SSH keys without an internet connection. All cryptographic operations run locally in your browser.

Should I use a passphrase for my SSH key?

Yes, using a passphrase is highly recommended. A passphrase adds an extra layer of security - even if someone gains access to your private key file, they cannot use it without the passphrase. Use a strong, memorable passphrase for important keys.

Can I use the same SSH key for multiple servers?

Yes, you can use the same SSH public key on multiple servers. However, for better security practices, consider using different keys for different purposes (e.g., work vs personal, production vs development). This limits exposure if one key is compromised.

What is an SSH key fingerprint?

An SSH key fingerprint is a short, unique identifier derived from your public key using a hash function (SHA256 or MD5). It's used to verify key authenticity when connecting to servers. The fingerprint helps you confirm you're connecting to the correct server.

What is the best SSH key algorithm in 2026?

Ed25519 is the recommended algorithm in 2026 for most use cases. It provides excellent security with a 256-bit key size, fast performance, and is supported by all modern SSH implementations. Only use RSA if you need compatibility with legacy systems.

What is the best SSH key generator online?

This SSH key generator is one of the best free online options because it runs 100% in your browser, supports modern Ed25519 and RSA algorithms, works offline as a PWA, and never sends your private keys to any server.

What is the authorized_keys file?

The authorized_keys file (located at ~/.ssh/authorized_keys on Linux/macOS servers) contains a list of public keys that are allowed to connect to that account. Each line is one public key. Add your public key to this file to enable passwordless SSH login.

What permissions should my SSH private key have?

Your SSH private key should have restricted permissions. On Linux/macOS, use 'chmod 600 ~/.ssh/id_ed25519' (owner read/write) or 'chmod 400' (owner read-only). SSH will refuse to use a key with permissive permissions. The .ssh directory should be 700.

SSH Key Generator Online - Free Secure Key Generation

Generate secure SSH keys instantly in your browser with this free online SSH key generator. Works with GitHub, GitLab, Bitbucket, and any SSH server.

SSH Key Generator Online