JKZ NETWORK
JKZ NETWORK
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Free SSL Certificate Checker

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Audit any domain's SSL certificate to verify validity, expiry dates, authority issuer, and domain matching to prevent browser trust warnings.

Why You Need to Check SSL Certificates

Secure Sockets Layer (SSL) and Transport Layer Security (TLS) certificates are critical for encrypting data sent between a user's browser and your web server. Without SSL, sensitive information like login credentials, personal details, and payment cards are transmitted in plaintext, leaving them vulnerable to interception. A live SSL checker parses your connection certificates to ensure they are configured correctly, verified by a trusted Certificate Authority (CA), and not approaching their expiration date.

The SEO and Trust Impact of Expired SSL

Modern browsers like Google Chrome, Safari, and Firefox actively warn users when they visit a site with an expired, missing, or mismatched SSL certificate. Visitors are greeted with a prominent "Your connection is not private" warning page, which causes bounce rates to spike and destroys user trust. Furthermore, Google uses HTTPS as a ranking signal, meaning that a broken SSL certificate will quickly degrade your organic search engine visibility.

Key Certificate Properties Analyzed

  • Validity Period: Active status and exact expiration dates.
  • Certificate Authority (CA): The issuer (e.g., Let's Encrypt, DigiCert) that verified the domain.
  • Subject Alternative Names (SANs): All subdomains and domains covered by this specific certificate.
  • Key Length and Algorithm: Security strength validation (such as SHA-256 and RSA key size).

To inspect server configurations after securing your site, use our HTTP/2 Checker and Brotli Checker to optimize delivery speeds.

Details - FAQ

SSL certificates are issued for a maximum of 398 days (approx 13 months), and Let's Encrypt certificates last 90 days. If auto-renewal fails or is not configured, the certificate will expire, triggering browser warnings.

A domain mismatch occurs when the SSL certificate's registered Common Name or SAN does not match the URL entered by the user (e.g., certificate is valid for secure.com, but accessed via domain.com).

TLS (Transport Layer Security) is simply the modern, more secure version of SSL. However, the term "SSL" is still commonly used to refer to both types of certificates.

Yes, free certificates (like Let's Encrypt) provide the exact same level of mathematical encryption as paid options. Paid certificates usually offer higher warranties, wildcard support, and extended organization validation.

This occurs when your server is not serving the full CA bundle file. You must re-configure your server (Nginx/Apache) to include both your primary certificate and the intermediate certificate bundle.

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