SSL certificate checker

Check that your SSL/TLS certificate is valid, trusted and not about to expire, and that every visitor is redirected to HTTPS. Free, online, results in seconds as part of a full security scan.

Run the free check

Certificate validity and expiry date

The checker reads the certificate your server presents, verifies that it is trusted and matches the domain, and shows how many days remain before expiry so you can renew in time.

HTTP to HTTPS redirect

A valid certificate is useless if visitors can still load the site over plain HTTP. WebGuard AI checks that HTTP requests are redirected to HTTPS and flags sites where HTTPS redirects back to HTTP.

HSTS and preload

Strict-Transport-Security tells browsers to always use HTTPS. The scan checks that HSTS is present, that max-age is long enough, and whether includeSubDomains and preload are set.

Frequently asked questions

How do I check if my SSL certificate is valid?

Enter your domain above. WebGuard AI connects to your server, reads the certificate and reports whether it is valid, who issued it and when it expires.

What happens when an SSL certificate expires?

Browsers show a full-page security warning and most visitors leave. Search engines and payment providers may also stop trusting the site. Renew at least two weeks before the expiry date.

Is the SSL check free?

Yes. The SSL check is part of the free security scan, which also reviews headers, DNS, exposed files and known vulnerabilities.

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