SSL Tools
SSL Expiry Checker
Check exactly when a domain's SSL certificate expires and how many days remain.
Enter a domain to check its SSL certificate's expiry date and remaining days.
JustChecker alerts you automatically before any SSL certificate expires.
Frequently Asked Questions
Most certificate authorities recommend renewing at least 30 days before expiry, leaving room to resolve any renewal or DNS-validation issues - many browsers hard-block a site the moment its certificate actually expires, with no grace period.
Every major browser shows a full-page security interstitial rather than a subtle warning, and most visitors simply leave rather than click through - an expired certificate effectively takes the site offline for HTTPS visitors.
Lifetimes vary by issuer - automated authorities like Let's Encrypt issue 90-day certificates specifically to encourage automated renewal, while commercial authorities have historically offered longer terms.
No - this is a read-only monitoring tool. It reports exactly how many days remain so you (or an automated renewal process such as Certbot/ACME) can act before the deadline.
If your server hasn't been restarted or reloaded to pick up a newly-issued certificate, it may keep presenting the old one over live connections - this checker reports exactly what the server is currently serving.
A certificate expiring soon is still fully valid and trusted right now, but needs attention - an already-expired certificate is immediately untrusted by every visiting browser, with no delay.
Not at all - that reflects a longer-lived certificate or a recent renewal. This checker is most useful as an ongoing monitor precisely because the "safe" window shrinks every day as the expiry date approaches.
Indirectly - search engines generally cannot properly crawl a site throwing a browser security error, and an outage caused by an expired certificate can affect crawl trust and click-through rates from search results.