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SSL Certificate Checker
Check a site's SSL/TLS certificate: issuer, validity dates, days left, TLS version and SAN domains.
We connect on port 443 and read the certificate.
Next step: Security Headers Checker →
About the SSL Certificate Checker
Checks a site's SSL/TLS certificate — who issued it, when it expires, the TLS version and which domains it covers. An expired or misconfigured certificate breaks HTTPS and scares off visitors.
What this tool checks
- Issuer, validity dates and days remaining
- TLS version negotiated
- SAN domains the certificate secures
Frequently asked questions
HTTPS is a ranking factor?
Yes — Google uses HTTPS as a lightweight ranking signal, and browsers warn on sites without it.
My certificate expires soon — what happens?
Once it lapses, browsers show a full-page security warning and blocked HTTPS. Renew (or enable auto-renew via Let's Encrypt) before then.
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