📖 What is SSH Key Generator?
SSH Key Generator creates public/private key pairs for secure server authentication. Generate RSA (2048/4096-bit) or Ed25519 keys with optional passphrases. The keys are generated entirely in your browser using the Web Crypto API — your private key is never transmitted over the network. Use it when setting up server access, GitHub SSH authentication, or automated deployments.
💡 Example
Input
Algorithm: Ed25519
Comment: user@laptop
Output
-----BEGIN OPENSSH PRIVATE KEY-----
(private key data)
-----END OPENSSH PRIVATE KEY-----
ssh-ed25519 AAAA... user@laptop
🛠️ Common Use Cases
- Generating SSH keys for GitHub, GitLab or Bitbucket authentication
- Creating keys for secure server access (AWS, DigitalOcean, etc.)
- Setting up passwordless SSH login
- Generating deploy keys for CI/CD pipelines
- Learning SSH key concepts
📝 RSA vs Ed25519
- Ed25519 — recommended. Faster, shorter keys, and equally secure. Supported by all modern SSH clients.
- RSA 4096 — widely compatible including older systems. Use when Ed25519 is not supported.
- RSA 2048 — minimum acceptable key size. Use 4096 for better security margin.
⚠️ Common Mistakes
- Sharing the private key — only the public key (.pub) goes on servers. The private key stays on your machine.
- No passphrase — unprotected private keys are vulnerable if your device is compromised. Use a passphrase.
- Wrong permissions — private key files must be chmod 600. SSH rejects keys with loose permissions.
❓ Frequently Asked Questions
Should I use RSA or Ed25519? ▾
Ed25519 is recommended — it is faster, uses shorter keys, and provides equivalent security. Use RSA only if you need compatibility with older systems.
Where do I put the public key? ▾
Copy the public key to ~/.ssh/authorized_keys on the server, or paste it into your GitHub/GitLab SSH settings.
What permissions should SSH keys have? ▾
Private key: 600 (chmod 600 id_ed25519). Public key: 644. The .ssh directory: 700.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.