SSL Certificate Checker

Why SSL matters

An SSL/TLS certificate encrypts the connection between your visitors and your website and proves your server is the real one for your domain. Without a valid certificate, browsers show a "Not secure" warning, visitors leave, and Google may rank the site lower. Certificates expire, so it is worth checking yours regularly, especially after moving hosting or changing DNS.

• Expired: renew or reissue the certificate.
• Wrong domain: the certificate must include the exact name (and www if used).
• Not trusted: self-signed or incomplete chain; install a certificate from a trusted authority.

Learn more in our guide to getting free SSL and HTTPS.

Frequently asked questions

What does an SSL checker do?

It connects to your website on port 443, reads the certificate your server presents and shows who issued it, which names it covers and when it expires. It also tells you whether browsers would trust it.

Why does my browser say Not Secure?

Common causes are an expired certificate, a certificate issued for a different domain name, a self-signed certificate, or a page that loads images or scripts over plain HTTP (mixed content).

How often should SSL be renewed?

Free certificates are valid for about 90 days and renew automatically. Paid certificates last up to a year. Check the days remaining here at any time.

Is a free SSL certificate secure?

Yes. Free certificates use the same encryption as paid ones. Paid options mainly add warranties and organisation validation.

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