SSL checker
SSL certificate checker
Check any site's SSL certificate: when it expires, who issued it, and whether the chain and hostname are valid. No signup, no wait.
Catch expiry before your visitors do
An expired certificate throws a full-page browser warning and blocks the site. The days-until-expiry is the number that matters.
Verify the whole chain
A certificate can be valid on its own but fail because an intermediate is missing or the hostname does not match. This checks both.
See who issued it
Confirm the issuer and validity window so you know the certificate is the one you expect.
Keep watch
Never get caught by a lapsed certificate
PageWarden watches your certificate around the clock and warns you well before it expires, so a renewal never slips.
Join the waiting listQuestions
SSL certificate checker, answered
More tools
Other free tools
Domain expiry checkerCheck when a domain's registration expires, who it is registered with, and which nameservers it uses. Straight from WHOIS.Open Domain expiry checkerIs it down checkerCheck whether a website is responding right now. You get the HTTP status code and response time, so you know if it is the site or your connection.Open Is it down checkerDNS lookup toolResolve a hostname's DNS records: A, AAAA, CNAME, MX, TXT, and NS. See exactly what the internet returns for it right now.Open DNS lookup toolPort checkerTest whether a TCP port is open and reachable on a host, from the public internet. Useful for services like SMTP, SSH, databases, and game servers.Open Port checkerAll toolsEvery free PageWarden checker in one place.Browse tools
Start watching your sites in two minutes.
Join the waiting list
Signups are paused while we prepare the full launch.