SSL Checker
Inspect the SSL/TLS certificate of any domain and get a full security report.
How it works
Enter a domain and the checker returns the certificate's issuer, validity period, remaining days, covered domains (SAN), signature algorithm, and the negotiated TLS protocol.
Worked example
Your certificate expires in 5 days and you forgot to renew. The checker shows the exact expiry date and remaining days, so you renew before browsers display a warning.
Recommendations
- Renew certificates at least 2 weeks before expiry to avoid outages
- Use automated renewal (Let's Encrypt) to remove human error
- Verify SAN covers all subdomains you serve, including www
Tips & advice
- Set calendar reminders for renewal regardless of automation
- Check certificates after changing hosting or CDN providers
- Watch for mixed content (HTTP resources on HTTPS pages) after going HTTPS
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SSL Checker
Inspect the SSL/TLS certificate of any domain and get a full security report.
Check my site — FreeSSL Checker — step by step
Type a domain like example.com. No need to include https://.
Click Check and the tool connects to the server and reads the certificate.
See the issuer, validity, remaining days, SAN domains and TLS version.
If expiry is near, renew immediately. If the report flags issues, fix the configuration.
SEO Tools FAQs
An SSL/TLS certificate encrypts the connection between visitors and your site and proves your identity, shown as a padlock in the browser.
Use an SSL checker to see the exact expiry date and days remaining, or set up alerts with your provider or monitoring tools.
A SAN (Subject Alternative Name) certificate covers multiple domains and subdomains in a single certificate.
Yes — HTTPS is a ranking signal and browsers mark non-HTTPS sites as not secure, which lowers trust and conversions.
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