Free SSL Checker
Enter a domain to instantly check its SSL certificate — valid or expired, when it expires, who issued it, and which domain names it actually covers.
Results and any AI-generated content from this tool are provided free, "as is", for general informational purposes only and may be inaccurate, incomplete, or out of date. Always verify the output yourself before relying on it — you use this tool and its results at your own risk.
By using this tool you agree to our Terms & Conditions and Privacy Policy.
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Why SSL certificates matter
Every browser marks a website "Not Secure" the moment its SSL/TLS certificate expires or doesn't match the domain being visited — and modern browsers show a full-page warning, not just a small icon. For a business website, that means lost customer trust at the exact moment someone is about to fill in a contact form, book an appointment, or make a payment. SSL certificates typically last 90 days to a year and renew silently in the background — until, occasionally, an auto-renewal fails and nobody notices until a customer complains.
This free SSL checker connects directly to your domain, reads its real certificate, and tells you in plain language whether it's valid, when it expires, who issued it, and exactly which domain names (including wildcards) it covers — the same information a browser checks, made readable.
What each result means
Valid (green) — your certificate is current and covers
this exact domain. Expiring soon (amber) — your certificate
is still valid today but expires within 30 days; renew it before then to
avoid a browser warning. Problem found (red) — the
certificate has already expired, isn't valid yet, or doesn't cover the
domain you checked (a common cause: checking www.example.com
when the certificate only covers example.com, or vice versa).
How to fix an SSL problem
Most hosting providers and CDNs (including Cloudflare, which many small businesses use for free) auto-renew certificates — an expired certificate usually means renewal is stuck, DNS has changed, or billing lapsed on your hosting account. Contact your host or domain registrar with this tool's result if you see a red or amber verdict. A BizGo business page is served over HTTPS with a managed, auto-renewing certificate from day one — one less thing to monitor yourself. Also worth checking: how long your domain has been registered with the free Domain Age Checker, and how your link previews look on WhatsApp with the Link Preview Checker.
Frequently Asked Questions
Yes, completely free with no login required, up to 20 checks per day.
Renew your SSL certificate before that date, either through your hosting provider's control panel or by contacting whoever manages your website — an expired certificate shows visitors a browser security warning.
This usually means a www vs. non-www mismatch (the certificate covers example.com but you checked www.example.com, or vice versa) or that the wrong certificate is installed for this domain.
Results are cached for 1 hour to keep the tool fast, but no personal information is collected — just the domain name and its certificate details.
A wildcard certificate (shown as *.example.com in the SAN list) covers every subdomain of a domain automatically, so blog.example.com and shop.example.com are covered by the same certificate as example.com.
