Tool
What the SSH Key Fingerprint does
SSH Key Fingerprint: calculates Fingerprint, Key type and Bits from OpenSSH public key (authorized_keys / id_*.pub line).
With OpenSSH public key (authorized_keys / id_*.pub line) entered, the SSH Key Fingerprint works out Fingerprint, Key type and Bits. Change any input and the output follows immediately.
Reusing a password is still the single most common way accounts fall over. That is usually what brings someone verifying a download here.
Because it is all local, the tool is as fast as your device and as private as your own notes.
Field definitions, the method, and a worked example from the default values are all set out further down the page.
What do the SSH Key Fingerprint fields mean?
The SSH Key Fingerprint uses 1 input. None of the boxes start empty. The page loads with a worked set of values you can edit or replace.
| Field | What to enter | Default |
|---|---|---|
| OpenSSH public key (authorized_keys / id_*.pub line) | paste or type any amount of text | ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGxHf0Iu6W2n3YVyZ2b3x8nVzq0mQm7kq5c7Q1dYvE8e demo@example.com |
How does the SSH Key Fingerprint work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Bad input produces an error, never a confident-looking wrong answer.
What a typical run looks like
You provide: OpenSSH public key (authorized_keys / id_*.pub line)
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: the finished file to download, with a line in the panel saying what was done.
Because the work is local, speed depends on your device rather than our servers, and large files are limited only by available memory.
How to use it
- Paste your content into OpenSSH public key (authorized_keys / id_*.pub line).
- No submit step is needed; the output updates while you edit.
- Look at Fingerprint, Key type and Bits in the output panel.
- Use Copy Link if you want the same setup again later, or Print for a paper copy.
What this tool does not do
- Randomness comes from your browser's cryptographic random source, which is suitable for passwords and keys.
- Anything generated here is only as safe as where you store it afterwards.
- Treat it as a fast first pass, not as the final word on a decision that matters.
Frequently asked questions
You need OpenSSH public key (authorized_keys / id_*.pub line). Each field is pre-filled with a sensible default, so nothing is mandatory before you see a result.
No. There is no account, no session and no storage. The values exist only while the tab is open.
Free for any use, personal or commercial.
The computation is exact; how much you should trust the answer depends on how good your inputs are.