SSL Certificate Checker

Verify HTTPS security, expiration, issuer, and certificate details for any domain.

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About the SSL Certificate Checker

An SSL/TLS certificate is what turns http:// into https:// — it encrypts the connection between a browser and your server and proves the site is who it claims to be. When that certificate expires or is misconfigured, browsers stop trusting it and show a full-page security warning instead of your page.

This checker opens a live TLS connection to the domain you enter and reads the certificate the server actually presents — not a cached record. You get the real status, who issued it, every hostname it covers, and exactly how many days remain before it expires.

How to use it

  1. Enter a domain (for example, example.com) — no need to type https://.
  2. Press Check. We connect to the host over TLS from our servers and read the live certificate.
  3. Review the result: status, issuer, subject, the Subject Alternative Names it covers, the validity dates, and days remaining.
  4. If it shows “expiring soon,” renew before the deadline; if it shows an invalid chain, fix the intermediate certificate on your server.

Why it matters for SEO

  • HTTPS is a confirmed Google ranking signal — a broken or expired certificate puts that at risk and can drop the padlock users look for.
  • An expired certificate triggers a browser interstitial warning that most visitors immediately back out of, so conversions and traffic fall off a cliff.
  • Certificates fail silently. Nothing warns you the morning it expires, so checking the remaining days ahead of time is the difference between a calm renewal and an outage.
  • A valid, trusted chain is also required for many APIs and integrations to talk to your site at all.

Frequently asked questions

How often should I check my SSL certificate?

Check whenever you launch a site or change hosting, and then periodically — monthly is plenty for most sites. If your certificate auto-renews (for example via Let’s Encrypt), a quick check a week before the renewal date confirms the automation actually worked.

What happens when an SSL certificate expires?

Browsers stop trusting the connection and show a full-page “Your connection is not private” warning. The page is effectively unreachable for most visitors until you install a valid certificate, and search crawlers may flag the site as insecure.

Does an SSL certificate affect SEO?

Yes. HTTPS is a lightweight ranking signal, and more importantly a broken certificate removes the secure connection Google expects, hurts user trust, and can crater the engagement metrics that influence rankings.

Is this SSL checker free?

Yes — the SSL Certificate Checker is completely free with no sign-up. It reads the public certificate any server presents during the TLS handshake.

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