Audit & Analysis · Free tool

SSL Certificate Checker — Validity, Issuer & Expiry

Free SSL certificate checker: verify HTTPS validity, issuer, covered domain names and days until expiry for any website. Avoid browser security warnings.

Step by step

How to use the SSL Certificate Checker

01Enter the domain
02Click "Run SSL Certificate Checker" — it's free and instant
03Review your results on screen and download the PDF/Excel report

What is the SSL Certificate Checker?

An SSL/TLS certificate lets a site serve pages over HTTPS. This checker connects to a domain and reports whether the certificate is valid, who issued it, which domain names it covers and how many days remain before it expires.

Why it matters for SEO

An expired or mismatched certificate triggers a full-page browser warning that drives away almost every visitor and stops crawlers. HTTPS is also a confirmed lightweight ranking signal. Checking expiry dates — especially on certificates that do not auto-renew — prevents an avoidable outage.

How to read your SSL Certificate Checker results

Days remaining under 14 deserves action if auto-renewal is not set up. The covered names must include the exact host you serve, with or without www. Free certificates such as Let’s Encrypt are perfectly valid; they simply renew every 90 days.

Expert tips

Enable auto-renewal at your host or CDN.
Cover both example.com and www.example.com.
Redirect all http:// URLs to https:// with a single 301.
Add HSTS once HTTPS is stable — check it with the HTTP Header Checker.

Limitations

Checks only the single URL you enter, as our server fetches it. It does not crawl the whole site, run JavaScript, or see pages behind a login.

Why use our SSL Certificate Checker?

Completely free — use SSL Certificate Checker as many times as you want
No login or registration needed to see results
Download the report as PDF or Excel with a free account
Works on any device — desktop, tablet or mobile

Frequently asked questions

Enter your domain here; the tool shows validity, issuer and expiry. Browsers also show a padlock for valid certificates.

Yes, HTTPS is a lightweight ranking signal, and certificate errors block users and crawlers entirely.

Yes. Let’s Encrypt and similar free certificates provide the same encryption as paid domain-validated certificates.

Browsers show a security warning and most visitors leave. Renew before expiry to avoid it.

Yes. SSL Certificate Checker is 100% free with unlimited usage. You can run it as often as you like without paying anything.

No login is required to use SSL Certificate Checker and see your results. You only need a free account if you want to download reports as PDF/Excel or save your history.