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SSL Certificate Checker

Check any domain's SSL certificate: issuer, validity dates, days until expiry and the domains it covers. Catch expiring certificates before browsers warn your visitors.

Why SSL is an SEO issue, not just a security one

HTTPS has been a Google ranking signal since 2014, and browsers now mark plain-HTTP pages "Not secure" — which costs trust and conversions regardless of rankings. The quieter risk is expiry: a certificate that lapses takes your site effectively offline behind a full-screen browser warning. This checker connects to any domain, reads the live certificate, and reports the issuer, validity window and days remaining.

What to do with the result

Under 30 days remaining with no auto-renewal in place is an incident waiting to happen — most certificates today (Let's Encrypt included) are designed for automated renewal, so a short remaining window usually means the automation broke silently. While you're checking infrastructure, run the page-level SEO check — sites with certificate drift often have canonical and redirect drift too.

Frequently asked questions

Yes. HTTPS has been a ranking signal since 2014, and browsers mark plain HTTP pages as 'Not secure', which hurts trust and conversions. An expired certificate takes your site effectively offline for most visitors.

Publicly trusted certificates are capped at 398 days, and free Let's Encrypt certificates last 90 days with automated renewal. Check that renewal automation is actually working — expiry is one of the most common self-inflicted outages.