Free SSL Certificate Checker
Enter any domain to see its SSL certificate's expiry date, issuer, days remaining and whether the chain is valid. No signup, no install — results in seconds.
How to read the result
Days left counts down to the certificate's expiry. Issuer is the certificate authority that signed it. Chain valid means the certificate and its intermediates resolve to a trusted root — if it's invalid, browsers will warn visitors even before the cert expires.
Why SSL expiry matters
An expired certificate breaks HTTPS instantly: browsers show a full-page security warning and traffic drops to zero. Renewals are easy to forget across many sites and registrars — and the failure is silent until a visitor hits the warning. Lapseguard watches expiry across all your domains and warns you before it lapses, not after the angry call.
Questions, answered
- How often should I check my SSL certificate?
- Manually, there's no good cadence — certificates expire on their own schedule and a missed renewal is silent until the site breaks. Continuous monitoring is the only reliable answer.
- What happens when an SSL certificate expires?
- HTTPS stops working. Browsers show a full-page 'Your connection is not private' warning and most visitors leave immediately. There is no grace period.
- Does this tool store my domain?
- No. We run a one-off check and return the result. Nothing is saved unless you choose to start monitoring it.
- How do I get alerted before a certificate expires?
- Start monitoring the domain in Lapseguard — you'll get email and Slack alerts well before expiry, with thresholds you control.