Free SSL Certificate Expiry Checker
Enter any domain to see exactly when its SSL/TLS certificate expires — instant, free, no signup.
Works for any publicly reachable HTTPS site. We read the certificate only — nothing is stored.
Why check SSL certificate expiration?
Browsers block expired sites
The moment a certificate lapses, visitors see a full-page security warning instead of your site. Most won't click through — they'll just leave.
Big names get burned too
An expired certificate took Microsoft Teams down for 3 hours. Spotify went dark twice. Ericsson's lapsed cert knocked out mobile data for 32 million people.
Checking once isn't enough
Certificates renew every 90–398 days, across every domain, subdomain, and client you manage. The one that bites you is the one nobody was watching.
SSL expiry questions, answered
How do I check when an SSL certificate expires?
Enter the domain (like example.com) in the checker above. We connect to the site over HTTPS, read its certificate, and show the exact expiration date, days remaining, and the issuer — no signup needed.
What happens when an SSL certificate expires?
Browsers show a full-page security warning and most refuse to load the site. APIs and integrations calling the site start failing immediately. Expired certificates have caused major outages at Microsoft Teams, Spotify, and Ericsson.
Does this work for expired or self-signed certificates?
Yes. The checker reads the certificate even if it has already expired or is self-signed, and shows how many days ago it lapsed.
Can I get alerted before my certificate expires?
Yes — that's what CredClock does. Track certificates plus API keys, domains, passwords, and licenses, and get email, Slack, or Teams reminders before anything expires. The free plan covers 25 credentials.
Why can't it find my internal certificate?
The checker only reaches publicly accessible hosts on port 443. For internal certs, VPN endpoints, or anything off the public internet, track the expiration date manually in CredClock — that's exactly what it's for.
Checking one cert today doesn't protect you next quarter.
Track every certificate, API key, domain, and password expiration in one place — and get reminded before anything breaks.
Start Tracking Free