What this tool does
Analyzes SSH keys (OpenSSH/PEM) and shows key type, bit length, fingerprint, and format details.
This page focuses on practical, step‑by‑step usage for **SSH Key Analyzer**, with clear examples and common pitfalls.
When you should use it
Use it when debugging SSH auth, converting keys, or auditing key strength.
How to use
- Paste the public key line or PEM block.
- Review type (rsa/ed25519/ecdsa) and fingerprint.
- Confirm permissions and format expectations.
Quick example
Example: Check whether a key is ed25519 and confirm the fingerprint matches your known host record.
Notes
Public keys are shareable; keep private keys secret and encrypted with a passphrase.
SSH Key Analyzer
Comprehensive SSH key analysis with fingerprint generation and security validation
Complete SSH Key Analysis:
Generate MD5 and SHA256 fingerprints for key identification
Check key strength, algorithm security, and potential vulnerabilities
Validate SSH key formats for RSA, DSA, ECDSA, and Ed25519
Extract key size, algorithm, comment, and creation details
Extract public key from private key and generate authorized_keys format
Analyze key performance characteristics and compatibility
Convert between different SSH key formats and representations
Check key age, usage patterns, and rotation recommendations
Analyze SSH Key
Paste your SSH public or private key for comprehensive analysis
Upload SSH Key File
Upload SSH key files for analysis (supports .pub, id_rsa, id_ed25519, .ppk, etc.)
Drop your SSH key file here or click to browse
Supports .pub, .ppk, id_rsa, id_dsa, id_ecdsa, id_ed25519 files (max 10KB)
Privacy & Security
We do NOT store or log any SSH keys. All analysis happens locally in your browser.
All key analysis happens in your browser - keys never leave your computer.
We do not track your analysis requests or collect personal information.
Get immediate results without any server processing delays.
SSH Key Security Best Practices
Prefer Ed25519 or ECDSA over RSA. Avoid DSA which is considered weak.
Use at least 2048-bit RSA, 256-bit ECDSA, or Ed25519 keys.
Rotate SSH keys regularly and revoke unused keys promptly.
SSH Key Reference Guide
FAQ
Is SSH Key Analyzer encryption?
No. It is primarily an analysis/encoding utility. If you need confidentiality, use a real encryption scheme and manage keys properly.
What should I do if the input fails to decode/parse?
Start by checking for missing padding, wrong alphabet/variant, or extra whitespace. If the data looks multi-layered, try decoding step-by-step (e.g., URL decode → Base64 decode).
Is it safe to paste sensitive data here?
For best security, avoid pasting real secrets (private keys, live tokens, seed phrases). Use test data or work offline, especially for anything that could grant access or move funds.