SEO Tool

SSL certificate checker

Анализ безопасности, срока действия и настроек SSL/TLS

Disclaimer: SSL certificates are public information sent on every HTTPS connection. Data is provided "as is" for diagnostic purposes.

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SSL certificate: control without surprises

What the tool checks

The service connects to the site over HTTPS and shows the certificate issuer, validity period, the list of domains (SAN), the completeness of the chain and the TLS version in use.

The most common problem is an expired certificate: the site instantly “goes down” for visitors even though the server is running. The second most common is an incomplete chain, which prevents the site from opening on some devices.

Recommendations

Set up automatic certificate renewal and expiry monitoring. Use TLS 1.2+ and disable outdated protocols.

Make sure the whole site works over HTTPS with a 301 redirect from HTTP, and that pages have no mixed content — images and scripts loaded over HTTP.

Frequently asked questions

Does HTTPS affect search positions?+

Yes. HTTPS has been an official Google ranking factor since 2014, and Yandex also favors secure sites. In addition, browsers mark HTTP sites as “not secure”.

What happens if the certificate expires?+

Browsers start showing a full-screen security warning, and almost all visitors leave. Check the expiry date in advance and set up auto-renewal — for example, for Let’s Encrypt.

What is the difference between DV, OV and EV certificates?+

DV confirms only domain ownership and is issued in minutes (including for free). OV and EV additionally verify the organization. For SEO and encryption there is no difference — DV is enough for most sites.

What is a certificate chain?+

Your certificate is signed by an intermediate one, and that by a root certificate authority. If the server does not serve the intermediate certificates, some browsers and programs cannot verify the site’s authenticity.