Are my generated keys sent to a server?

No. All key generation runs locally in your browser and keys are never transmitted over the network.

Which algorithm should I choose?

Ed25519 is recommended for modern systems due to its speed and security, while RSA 4096 is best for legacy compatibility.

How do I use the public key on my server?

Copy the generated OpenSSH public key string and append it to the ~/.ssh/authorized_keys file on your remote server.

Why is the private key in PKCS#8 PEM format?

Browser-based generation outputs standard PKCS#8 PEM. You can convert it to the OpenSSH private key format using ssh-keygen -p if required.

Can I secure my private key with a password?

Yes. Entering a passphrase encrypts the private key using AES-256-CBC before outputting it.

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Security

SSH Key Pair Generator

Generate an SSH key pair (Ed25519 recommended, RSA 4096, or ECDSA P-256) with an OpenSSH-format public key ready for ~/.ssh/authorized_keys, a SHA256 fingerprint, and a PEM private key. Optional passphrase encryption. Runs locally.

Details

What this tool helps you do

Generates an SSH key pair and formats the public key in OpenSSH one-line format.

Algorithm:
Ed25519 (recommended) — modern, small, fast, the default in OpenSSH since 2015. 256-bit security.
RSA 4096 — large but widely compatible with very old SSH servers. Use only if Ed25519 isn't supported.
ECDSA P-256 — compact alternative; less common than Ed25519.
Comment: appended to the public key (e.g. alice@laptop). Helps identify the key in authorized_keys.
Passphrase: if provided, the private key is encrypted (AES-256-CBC, PKCS#8).

Outputs:

Public key in OpenSSH format (ssh-ed25519 AAAA... comment) — paste directly into ~/.ssh/authorized_keys.
SHA256 fingerprint (SHA256:...) for verifying the key over an insecure channel.
Private key in PKCS#8 PEM. (Node cannot emit the OpenSSH private-key container natively; convert with ssh-keygen -p if you need the BEGIN OPENSSH PRIVATE KEY format.)

Everything runs locally; keys never leave the request.

Execution

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Result

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Samples

SSH Key Pair Generator

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Setting up secure access to a new cloud VPS

2. Generating an encrypted RSA key for legacy server compatibility

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