Find out if a certificate is expired or about to lapse — before browsers block your visitors.
See whether the certificate is still active
Exact date and days remaining
Whether major browsers trust the chain
No account required · Free · Results in under 1s
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Why expiry matters for every public website
An expired SSL certificate means browsers no longer trust the HTTPS connection. Chrome, Firefox, Safari, and other browsers warn users or block the page entirely.
Renewals are easy to miss on staging subdomains, CDN edges, or load balancers. This checker validates the live certificate served for the hostname you enter — the same view your visitors get.
Run a check after renewals or server changes. Add monitoring if you want email alerts before the next expiry.
Free TotalSiteControl monitoring — email alerts, no credit card required.
Notifications 30, 14, and 7 days before lapse.
Catch broken intermediate chains before browsers do.
Audit trail for renewals and incident reviews.
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Enter the domain here. We connect over HTTPS and read the certificate expiry date. If today's date is past the Not After field, the certificate is expired and browsers will show security warnings.
Browsers display warnings such as "Your connection is not private" and may block access. Visitors often leave immediately, which hurts conversions and SEO until the certificate is renewed.
Yes. Enter the exact hostname visitors use, such as www.example.com or api.example.com. Each hostname can serve a different certificate with its own expiry date.
Yes. Run unlimited one-off checks with no signup. Optional monitoring alerts are also free to start.