🔐 SSL Certificate Checker
Check a website's SSL/TLS certificate — issuer, validity dates, days until expiry, and covered domains.
About the SSL Certificate Checker
The SSL certificate checker inspects a website's TLS/SSL certificate and reports its validity, issuer, and expiration date. A valid, current certificate is what enables the secure padlock in browsers and encrypts data between your visitors and your site.
Expired or misconfigured certificates trigger alarming browser warnings that scare away visitors and can break functionality. Checking a certificate's expiry ahead of time lets you renew before it lapses and avoid an embarrassing outage.
Enter a domain to instantly and privately check its SSL certificate status, issuer, and how many days remain before it expires.
Frequently asked questions
What is an SSL certificate?
An SSL/TLS certificate is a digital credential that encrypts the connection between a browser and a website and verifies the site's identity. It is what powers the https padlock.
What happens when an SSL certificate expires?
Browsers show a security warning that blocks or discourages access, which erodes trust and can break the site. Certificates should be renewed before their expiration date.
How often should I check my SSL certificate?
Check periodically and before renewals. Many certificates last 90 days to a year, so a routine check helps you catch an upcoming expiry in time.