Is it safe to generate SSH keys in a web browser?

Yes, on FileXShare. Key generation is powered entirely by your browser's native Web Crypto API. The private key never leaves your device and is never sent over any network.

Which algorithm should I choose for modern servers?

Ed25519 is the modern default: fast, compact, and widely supported since OpenSSH 6.5. Use RSA 4096 or ECDSA only for legacy servers requiring broad compatibility.

Where do I paste the generated public key?

Copy the OpenSSH format string and append it to your remote server's ~/.ssh/authorized_keys file, or add it to your GitHub / GitLab account under SSH Keys.

What permissions should I give my downloaded private key on Linux/macOS?

You should restrict private key file permissions using chmod 600 id_rsa so that only your local user account can read it.

SSH Key Generator — Ed25519

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Inputs stay in browser memory. No external request is required for this operation, and zero data leaves your device.