Check any website's SSL certificate
Instant SSL check from our servers. See if the certificate is valid, when it expires, and how many days remain. No app install, no signup.
The SSL Certificate Checker reads any website's live certificate and returns whether it is valid, its expiry date, the days remaining, and the issuer, in under 10 seconds. A safe renewal window is at least 30 days before expiry, so anything inside that is worth acting on.
What the check shows
Three signals that tell you whether your certificate is healthy or about to become a problem.
Validity
Whether the certificate is trusted by browsers and not expired or self-signed.
Days remaining
Exactly how many days until the certificate expires, color-coded so you know if renewal is urgent.
Issuer and name
Which authority issued the cert and the common name it was issued for.
One check vs. continuous monitoring
A manual check tells you the status today. It cannot warn you the week before the certificate lapses.
This free check
- Tells you the status right now, once
- You have to remember to check again before expiry
- No warning the week before it lapses
- A missed renewal means a security warning for every visitor
Beaconmon monitoring
- Tracks expiry continuously, 24/7
- Alerts you well before the certificate lapses
- Watches SSL alongside uptime and content
- No spreadsheet of renewal dates to maintain
Frequently asked questions
How do I check if my SSL certificate is expired?
Paste your domain into the tool above and it reads the live certificate from port 443 in under 10 seconds, returning whether it is valid and exactly how many days remain. A negative number means it has already expired, and visitors are seeing a browser security warning instead of your store.
What happens when an SSL certificate expires on a Shopify store?
Browsers show a full-page security warning that most shoppers will not click past, so conversions drop to near zero until it is fixed. Shopify auto-manages SSL for stores on its domains, but custom domains and subdomains can still lapse. An expired cert can cost a busy store thousands of dollars per hour during a sale.
How often should I check my SSL certificate?
Manually, at least once a month, and always after a domain or hosting change. A certificate that looks fine today can still lapse in 30 days if auto-renewal silently failed. Continuous monitoring removes the guesswork by checking every day and alerting you before the 15-day danger window.
What is a good SSL certificate renewal window?
Renew at least 30 days before expiry. That leaves time to fix a failed auto-renewal, update DNS validation, or contact your host before customers ever see a warning. This tool flags any certificate with fewer than 60 days left in amber and fewer than 15 days in red so you can act early.
Does Beaconmon monitor SSL expiry automatically?
Yes. Beaconmon tracks your certificate expiry continuously and sends an alert well before it lapses, alongside uptime and content monitoring. The free tier includes 10 monitors at no cost, so you can watch SSL on your main domain and key subdomains without paying anything to start.
Never get caught by an expired certificate.
Beaconmon watches your SSL expiry and alerts you well before it lapses, alongside uptime and content. Free forever for 10 monitors, no card required.