Security tool
SSL certificate checker
Enter a domain to see its HTTPS certificate, who issued it and when it expires.
Why certificates matter
An SSL/TLS certificate lets your browser confirm it’s talking to the real site and encrypts the connection. When a certificate expires or doesn’t match the domain, browsers show a security warning, and the site can look “down” even though the server is running.
Seeing a warning on a site?
Run a website check to find out if the site is reachable, or inspect its HTTP headers.