SSHCheck SSH Key Checker

All tools on SSHCheck

Everything on this site runs 100% in your browser. No uploads, no accounts, nothing sent anywhere.

SSHCheck (main tool) Free, 100% client-side SSH public key tools. Quick format check on the home page; the key inspector decodes the key, reports type, size and SHA-256 fingerprint, and the authorized_keys checker finds broken and duplicate lines. Primary tool SSH Public Key Inspector and Fingerprint Decode an OpenSSH public key in your browser: key type, RSA or curve size, the SHA256 fingerprint that ssh-keygen -l prints, and warnings for weak sizes, wrapped lines, private keys and mismatched type fields. Tool authorized_keys Checker Paste an authorized_keys file and see each line decoded or rejected, weak keys marked, and duplicate keys found by fingerprint even when their comments differ. Runs in your browser. Tool

Looking for explanations rather than a tool? SSHCheck guides cover 2 worked examples and gotchas.

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