SSL Checker
Use our fast SSL Checker to diagnose certificate health, HTTPS setup, expiration, and TLS trust for any website.
How it works
The tool connects to the site over TLS and reads the certificate chain. It does not validate trust against your browser; it reports the certificate metadata and whether the TLS connection was authorized by Node's default trust store.
Verify HTTPS Security and SSL Certificate Health
SSL Certificate Checker inspects a website certificate, expiration dates, issuer details, SAN entries, and TLS authorization status so you can keep your site secure.
Why SSL matters for SEO and trust
HTTPS is a ranking signal and a trust signal. Secure sites are preferred by search engines and users alike, so maintaining a valid SSL certificate is essential for modern website performance.
Check certificate validity and expiration
Expired certificates cause browser warnings and damage user confidence. This tool shows the certificate validity window and remaining days, so you can renew before the site becomes insecure.
Review issuer and subject information
Certificate details such as issuer name, subject common name, and SAN entries confirm that the site is properly configured. Mismatched or incorrect settings can cause errors and impact site accessibility.
Understand TLS authorization results
The tool reports whether the TLS connection is authorized by the default trust store. That helps you identify issues such as self-signed certificates or certificate chain problems.
Support secure redirects and canonical URLs
SSL works best when all site URLs redirect to HTTPS and canonical tags point to secure addresses. Using this tool helps you confirm the certificate is ready for secure indexing.
Keep security checks part of your SEO workflow
Regular SSL checks prevent unexpected outages and protect your search performance. Add this check to your routine whenever you deploy a new certificate or update your hosting setup.
Use SSL Certificate Checker to maintain secure, search-friendly HTTPS sites and avoid expiration or trust errors.
Resources & Related Tools
Frequently Asked Questions
Why is SSL certificate important for SEO?
Google prefers HTTPS websites because they are more secure. A valid SSL certificate helps protect user data and can contribute to better search rankings.
How do I know if my SSL certificate is expiring soon?
This tool shows the certificate expiry date and remaining days, making it easy to renew before it expires and causes browser warnings.
What does authorization error mean?
An authorization error means the certificate chain was not trusted by the client. This can happen with self-signed certificates, missing intermediates, or a certificate issued by an untrusted authority.
Can a self-signed certificate hurt search visibility?
Yes. Self-signed certificates are not trusted by browsers and can block traffic, so they are not suitable for public websites or SEO-sensitive pages.
How do I fix a certificate name mismatch?
Ensure the certificate includes the exact domain and all subdomains you use, preferably through Subject Alternative Names (SAN). Mismatches can trigger browser warnings.
Does HTTPS improve visitor trust?
Yes. Visitors are more likely to trust sites that show a secure HTTPS connection, and modern browsers explicitly label secure pages as safe.