SSH Key Generator — Ed25519 & RSA Key Pair Tool
Generate Ed25519 and RSA 4096-bit SSH key pairs entirely in your browser. Keys are never sent to any server — 100% client-side using the Web Crypto API.
How to Use SSH Key Generator — Ed25519 & RSA Key Pair Tool
How to Use SSH Key Generator
Step 1: Choose Key Type
Select Ed25519 (recommended) for modern systems, or RSA for compatibility with legacy systems.
- Ed25519: Smaller keys, faster operations, excellent security. Supported by GitHub, GitLab, and all modern SSH servers.
- RSA 4096-bit: Maximum compatibility. Required for older systems. Slower to generate.
Step 2: Set a Comment
The comment helps identify the key in authorized_keys files. Use user@hostname format (e.g., alice@macbook).
Step 3: Generate
Click Generate Key Pair. Ed25519 keys generate instantly. RSA 4096-bit keys may take a few seconds.
Step 4: Save Your Keys
Private key:
# Save to ~/.ssh/id_ed25519 (or id_rsa for RSA)
chmod 600 ~/.ssh/id_ed25519
Public key:
- Copy to server: paste into
~/.ssh/authorized_keys - Add to GitHub/GitLab: Settings → SSH Keys → Add Key
Usage Examples
# Test connection to GitHub
ssh -T git@github.com
# Connect to a server
ssh -i ~/.ssh/id_ed25519 user@server
# Add to ssh-agent
ssh-add ~/.ssh/id_ed25519
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