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SSH Key Fingerprint Calculator

Compute the SHA-256 and MD5 fingerprints of an OpenSSH public key and read its details.

An SSH key fingerprint is a hash of the public key blob, shown as SHA256 followed by base64. It is what your client displays when connecting to an unknown host, and what you compare to confirm a key is the one you expect. This tool computes it and reads the key type and strength.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why does my fingerprint differ from an older one I recorded?

OpenSSH 6.8 changed the default from MD5 in hex to SHA-256 in base64. They describe the same key in different ways. Compare like with like — modern ssh-keygen -lf output is the SHA-256 form.

Is it safe to paste a public key here?

Yes. A public key is designed to be shared — it goes in authorized_keys on every server you access. Never paste a private key anywhere, including here.

How to use the ssh key fingerprint calculator

  1. 1Enter or paste your openssh public key.
  2. 2Press Run, then download the result when it is ready.

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