SSH Key Fingerprint Calculator
Compare hashes and OpenSSH randomart from public key lines.
Try before you buy.
- Free preview: the rules, dates and checks that apply to your figures, with every computed amount hidden.
- Locked until you unlock it: download and copy.
- Unlock: Pro pass, ₹179 for 30 days or ₹79 for 1 week, a one-time payment that never renews. Unlock: Pro pass, $5.99 for 30 days or $2.99 for 1 week, a one-time payment that never renews.
Ways to unlock shows how to get the full result.
Printing this result is locked in the free preview.
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Format, privacy and use notes
Locked in the free preview. Opens the ways to unlock this result.
Locked in the free preview. Batch runs unlock with a pass.
Locked in the free preview. Query results unlock with a pass.
About the SSH Key Fingerprint Calculator
Read plain Ed25519, RSA, ECDSA or DSA public-key lines, including authorized_keys options and known_hosts prefixes. Calculate the SHA256 fingerprint and legacy MD5 form, identify the key size and comment, and draw the OpenSSH SHA256 randomart pattern.
Weak RSA and legacy DSA warnings remain readable in the free preview. A Pro pass opens complete fingerprints, key details, randomart, copy and report downloads. Compare a fingerprint through a separate trusted channel; parsing a key does not establish its owner.
How to use it
- Paste public key lines or choose a public-key text file; never supply a private key.
- Run the calculation and read any weak-key or format warnings.
- With a pass, compare the full SHA256 fingerprint and randomart against a trusted reference.
- Copy or download the full report with a pass; use legacy MD5 only for older records.
Format and verification
Fingerprints hash the supported canonical SSH public-key encoding. SHA256 is Base64 without padding; legacy MD5 is colon-separated hexadecimal. Randomart is the bounded diagonal walk over the SHA256 digest.
Sources
SSH key encoding, Ed25519 format and OpenSSH fingerprint/randomart options.
Limitations
- Supported plain key formats are Ed25519, RSA, ECDSA P-256/P-384/P-521 and DSA. SSH certificates and hardware-backed sk-* forms need a compatible external tool.
- Randomart helps visual comparison and is not an ownership or trust certificate.
- Comments and host names are unauthenticated labels. Malformed/noncanonical encodings are rejected instead of producing a misleading fingerprint.
Privacy
On this device; its files download once
Inputs, passwords, generated private keys and selected files stay on this device. The tool makes no domain/authority lookup, upload or persistent key store. Reset or leaving the page discards its result.
Frequently asked questions
What do I get without a pass?
Without a pass, SSH Key Fingerprint Calculator shows the rules, dates and checks that apply to your figures, with every computed amount hidden. Until you unlock it, the result can’t be downloaded or copied. A Pro, Premium or Ultimate pass, a one-time payment that never renews, unlocks the full result. The pricing page lists the passes and their prices.
Can I paste known_hosts?
Supported key entries can include a host prefix and standard marker. Host names remain labels; no network check is performed.
Why keep MD5?
It helps compare legacy records. Use SHA256 for new comparisons and establish the reference through a trusted channel.
Does a matching image prove the server is safe?
Check the full trusted SHA256 fingerprint. Randomart is a visual aid; neither establishes a server’s identity or safety by itself.