SSL Certificate Checker
Enter a domain to inspect its live SSL/TLS certificate. You'll see whether it's valid, who issued it, when it expires, and how many days remain, so you can catch problems before visitors hit a browser warning.
Want everything at once? Run a full domain report (WHOIS, DNS, SSL, headers, reputation, subdomains).
New to this? Read How to Check a Website's SSL Certificate (3 Ways).
Frequently asked questions
What does this SSL checker show?
It connects to the site over HTTPS and reports the live certificate: whether it is valid, the issuing certificate authority, the validity dates, how many days remain before expiry, and the negotiated TLS protocol.
What happens when an SSL certificate expires?
Browsers show a full-page security warning and block the site by default, so it effectively goes down for normal visitors. Certificates should be renewed (or auto-renewed) well before the expiry date.
How often should I check my SSL certificate?
If you use automated renewal (such as Let's Encrypt), occasional checks are enough. Otherwise, check periodically and set a reminder ahead of the expiry date, since a lapsed certificate breaks the site for everyone.