SSH Public Key Fingerprint Tool
Calculate SHA-256 and legacy MD5 fingerprints from an OpenSSH public key and inspect its wire-format fields.
Your input is sent to this site only after you choose Convert on server. The conversion runs for this request and no history is saved. Upload up to 4 MiB combined; Office files have a 2 MiB limit.
Enter your text
Edit the example text or paste your own content.
How to use SSH Public Key Fingerprint Tool
- Load the example or paste your own input.
- Review the settings, then select Convert on server to send input for processing.
- Review the result, then copy or download it.
What this tool helps you do
Compare an exported public key with a fingerprint shown by another system. Paste one OpenSSH public-key line, including its key type and Base64 payload. The tool calculates a SHA-256 fingerprint from the decoded SSH wire data and also provides the legacy colon-separated MD5 form for older comparison workflows. A trailing comment is treated as a label rather than key material.
Format rules and limitations
Supported key layouts are Ed25519, RSA and uncompressed NIST ECDSA public keys. The declared type must match the encoded type and the wire fields must have valid lengths. This inspects representation, not mathematical key strength, ownership or host authenticity. MD5 is supplied only for legacy comparison. Private keys, authorized_keys option prefixes and multi-key input are unsupported. Use a trusted channel to confirm fingerprints when authenticating a host.
Example input
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINdamAGCsQq31Uv+08lkBzoO4XLz2qYjJa8CGmj3B1Ea example-key
What should I check before relying on the output?
Supported key layouts are Ed25519, RSA and uncompressed NIST ECDSA public keys.
Is input uploaded?
This tool sends input to this site’s conversion API after you select Convert on server. Files use bounded workers and, when needed, private temporary folders deleted after processing or cancellation. No conversion history is saved. The converter does not upload files to a third-party conversion service.