How to Check an SSL Certificate and Fix 'Not Secure'
To check an SSL certificate, enter the domain in the free SSL Checker on pdfseotools.com. It shows the valid-from and expiry dates and every domain name the certificate covers. To fix "Not secure", make sure the certificate is valid for the exact domain, redirect http to https and remove mixed content.
Key facts
- Shows valid-from date, expiry date and covered domains (SANs)
- Free certificates often renew every 90 days
- "Not secure" = no HTTPS, expired/mismatched certificate or mixed content
- HTTPS is a light Google ranking signal
Check a certificate – step by step
✓Step 1: Enter the domain
📈 Open the SSL Checker and type the domain, e.g. example.com.
Step 2: Run the check
The tool connects to the server and reads the certificate.
Step 3: Check the dates
Make sure today is between the valid-from and expiry dates.
Step 4: Check the covered names
Confirm both example.com and www.example.com are listed if you use both.
Fixing "Not secure"
✕✓| Cause | Fix |
|---|---|
| No certificate | Install free SSL from your hosting panel |
| Expired certificate | Renew it; check that auto-renewal is turned on |
| Name mismatch (www missing) | Reissue the certificate to include both versions |
| Site still opens on http:// | Add a 301 redirect to https with the .htaccess Redirect Generator |
| Mixed content | Change http:// image, script and CSS links to https:// |
Avoid surprise expiry
✕✓- Put the expiry date in your calendar a week early.
- Check the certificate after changing hosting, DNS or CDN settings.
- Run the Website SEO Score Checker – it flags HTTPS, HSTS and mixed-content problems.
Open the SSL Checker on pdfseotools.com – free, no sign-up and it works on any device.
Domande frequenti
What does the SSL Checker show?
When the certificate became valid, when it expires, and which domain names (SANs) it covers.
Why does my browser say "Not secure"?
Usually the site opens on http:// without a redirect, the certificate has expired or does not cover the exact domain (e.g. www), or the page loads images or scripts over http (mixed content).
How do I get a free SSL certificate?
Most hosts, including Hostinger, offer free certificates (often Let's Encrypt) in the hosting panel. Cloudflare also provides free SSL.
How often do certificates expire?
Free certificates usually last 90 days and renew automatically. Paid ones commonly last up to about a year. Check expiry so auto-renewal failures do not surprise you.
Does SSL help SEO?
HTTPS is a light Google ranking signal, and it prevents the "Not secure" warning that scares visitors away.
Does the certificate need to cover www?
Yes, if anyone visits the www version. Check that both example.com and www.example.com appear in the covered names.
Summary
Valid dates, the right domain names, an https redirect and no mixed content – that is a secure padlock. Check yours with the SSL Checker and explore more free website checkers.
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