SSL Certificate Check
Certificate status, expiry date and full TLS details on port 443.
Frequently Asked Questions
What does this tool check about an SSL certificate?
It checks validity status, expiry date, the certificate chain, domain-name match, and warns about self-signed or untrusted certificates.
What is the "certificate chain" and why does it matter?
The chain is the trust path from the site's certificate up to a trusted root authority. If intermediate certificates are missing, some browsers show errors.
What is wrong with a self-signed certificate?
Because it is not signed by a trusted authority, browsers do not trust it and warn the user; it is not suitable for a public site.