SSL Certificate Checker
Check whether a website responds over HTTPS and review basic browser-visible SSL/TLS information.
How to Use the SSL Certificate Checker
Enter a website hostname to review its TLS/SSL certificate details, including validity dates and security-related information. This is useful for checking certificate expiry before it causes browser warnings or service interruptions.
Practical Example
If a certificate expires on October 15 and today is September 15, the site has roughly 30 days remaining to renew or replace the certificate before expiry.
Factors That Affect the Result
Certificate chains, server configuration, SNI, redirects, CDN termination, renewal timing and clock accuracy can affect what certificate is observed. A site may also serve different certificates from different endpoints.
Frequently Asked Questions
What happens when an SSL certificate expires?
Browsers and clients may show security warnings or reject the connection until a valid certificate is installed.
Does HTTPS always mean the certificate is valid?
No. HTTPS relies on TLS, but the certificate still needs to be valid, trusted and correctly configured.
How often should certificate expiry be checked?
Automated renewal is best, but periodic checks help catch configuration or renewal failures.