Check Private Key
Paste your private key below (RSA or EC, PEM format, including the header and footer lines).
Key Details
- Key Type
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- Key Size / Curve
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- Strength Rating
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- Format
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- Encrypted
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- Public Exponent (RSA)
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Security Checks
- Key size
- Valid PEM format
- Safe public exponent
- Modern algorithm
Key Size Recommendations
Choosing the right key size balances security and performance. Browser vendors and CAs follow NIST guidance on minimum acceptable key sizes.
RSA 4096-bit
Excellent — future-proof and exceeds all current CA/Browser Forum requirements. Recommended for high-security environments.
RSA 2048-bit
Secure — the current industry standard. Let's Encrypt and most CAs issue against 2048-bit keys. Acceptable until at least 2030.
RSA 1024-bit
Weak — deprecated by NIST since 2013. CAs will refuse to sign 1024-bit CSRs. Upgrade to 2048-bit or higher immediately.
EC P-256 / P-384
Excellent — elliptic curve keys offer equivalent security to RSA with much smaller key sizes and faster TLS handshakes.
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