A free SSL certificate checker that actually reminds you
Almost every SSL outage has the same root cause: a certificate expired and nobody noticed until the site went down. Publicly trusted certificates are now capped at roughly 398 days, and the industry is moving toward even shorter lifetimes, which means more renewals, and more chances for one to slip through. A traditional SSL checker tells you the expiry date; this one tells you, then emails you before it’s too late.
Enter a domain and the tool performs a real TLS handshake, reads the live certificate, and shows you exactly what your visitors’ browsers see: how many days until expiry, who issued it, every hostname it covers via its Subject Alternative Names, the signature algorithm, and the public-key type and size. Each result is graded with a plain-English pass, warning or fail, so you can tell at a glance whether HTTPS is healthy or about to break.
SSL expiry reminders, done properly
After a check, add your email and pick when you want to hear from us, 30, 7 and 1 day before expiry are the defaults, but you can choose anything from 60 days out to the day before. We confirm your address with a single double opt-in email (so nobody can sign you up without consent), then keep an eye on the certificate. If you renew early, we detect the new certificate and quietly re-arm your reminders against the new expiry. Every reminder email carries a one-click unsubscribe, and the only data we keep is the domain, your email, and your schedule.
A privacy-first SSLShopper & SSL.org alternative
If you’ve used SSLShopper or SSL.org to verify a certificate, this covers the same core job, reading the served certificate and checking its validity, issuer, chain and hostname coverage, with two deliberate differences. First, it adds the expiry reminder those tools don’t have, turning a one-off check into ongoing protection. Second, it’s privacy-first: it doesn’t store or publish the domains you look up. It’s a fast, no-friction certificate checker for developers, sysadmins and security teams who want the answer, and a safety net, without handing over their lookup history.
What the SSL checker verifies
Each check reports the validity window (and flags an expired or not-yet-valid certificate), performs a hostname match against the Subject Alternative Names, confirms the certificate is not self-signed, checks the signature algorithm (flagging deprecated SHA-1), and assesses key strength (flagging RSA keys under 2048 bits). It also notes when a certificate’s lifetime exceeds the 398-day maximum. Together these roll up into an A+ to F grade, a quick, honest read on whether a site’s TLS is in good shape.