SSH Key Inspector
Key Types Reference
Privacy First: Your files are processed securely. Whenever possible, processing happens in your browser and files are never stored on our servers.
Inspect and validate SSH public keys entirely in the browser - no data uploaded. Paste a key in any common format (ssh-rsa, ssh-ed25519, ecdsa-sha2-nistp256/384/521, ssh-dss, ssh-ed448). The tool parses the base64-encoded key body to extract key type, bit length (for RSA and DSA), and curve name (for ECDSA/Ed25519). Computes the SHA-256 fingerprint (the format shown by ssh-keygen -l -E sha256) and the classic MD5 fingerprint (colon-separated hex pairs). Displays the key comment, base64 body length, and key prefix. Security assessment rates the key: Ed25519 = Excellent, ECDSA = Good, RSA-4096 = Strong, RSA-2048 = Acceptable, DSA = Deprecated. Warnings are shown for keys below 2048-bit RSA, deprecated DSA keys, or broken 1024-bit RSA. Detects accidental private key paste and alerts immediately.
How to Use
- 1Paste your SSH public key into the text area (copy from ~/.ssh/id_ed25519.pub or similar)
- 2Click 'Inspect Key' - key type, bits, and fingerprints appear instantly
- 3Copy the SHA-256 fingerprint to verify it against your server or hosting dashboard
- 4Check the Security Assessment for a rating and any warnings about weak key sizes
- 5Use 'Load example' to see how the tool works with a sample Ed25519 key
Features
- Supports ssh-rsa, ssh-ed25519, ecdsa-sha2-nistp256/384/521, ssh-dss, ssh-ed448
- Parses base64 key body to extract key type, bit length, and curve name
- SHA-256 fingerprint (OpenSSH default format: SHA256:…)
- MD5 fingerprint (colon hex pairs: MD5:xx:yy:…)
- Security rating: Excellent / Good / Strong / Acceptable / Deprecated
- Warnings for RSA <2048 bits, broken RSA-1024, deprecated DSA
- Private key detection - alerts immediately if a private key is pasted
- Key comment and base64 body length shown
- 100% browser-based - key data never leaves your device
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