SSL Certificate Checker
Verify SSL/TLS certificate validity, expiry dates, and issuer details instantly.
Handshaking and retrieving certificate...
An error occurred.
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Valid Certificate Retrieved
Issuer Organization
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Subject Common Name
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Valid From
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Valid Until (Expiry)
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Raw Certificate Data
Why Check SSL Certificates?
Secure Sockets Layer (SSL) and Transport Layer Security (TLS) certificates authenticate a website's identity and enable an encrypted connection. Search engines heavily penalize websites lacking HTTPS, and browsers will actively block users from visiting expired certificates.
Our SSL Certificate Checker establishes a secure connection natively from our servers to the target domain, retrieving the raw cryptographic certificate. This is highly beneficial for sysadmins aiming to quickly diagnose chain issues, verify wildcard matches, or determine exactly when a certificate will expire.
Common Certificate Errors
- Expired Certificate: The validity period has passed. Users receive severe browser warnings.
- Name Mismatch: The certificate is only valid for `example.com` but the user visited `www.example.com`.
- Untrusted Root: The issuing Certificate Authority (CA) is not included in standard trusted stores.