SSL Checker: Verify HTTPS Security

Check your website's security certificate. Our SSL checker detects the issuer, expiration date, and TLS version to ensure your site is safe and trusted.

AI Overview

An SSL Checker performs a handshake with a web server to retrieve its digital certificate. It verifies the Certificate Authority (CA), identifies the encryption strength (RSA or ECC), and tracks the expiry date. For 2026, maintaining TLS 1.3 support is essential for both speed and modern security compliance.

What is an SSL Certificate?

An SSL Certificate (Secure Sockets Layer) is a digital file that binds a cryptographic key to an organization's details. Once installed on a web server, it activates the padlock and the HTTPS protocol, allowing secure connections from a web server to a browser. It is the backbone of internet security.

Pro Tip: Google Chrome and other browsers now flag any website without a valid SSL certificate as "Not Secure." This can significantly hurt your SEO rankings and user trust.

How to Fix "Not Trusted" Errors

If our SSL checker shows a warning, it is usually caused by one of these issues:

  • Expired Certificate: Your certificate has passed its validity date. You must renew it with your CA.
  • Missing Intermediate Chain: Your server isn't sending the "chain" certs. Most mobile devices will block your site if the CA Bundle is missing.
  • Self-Signed Cert: You are using a certificate you made yourself. Browsers only trust certificates from Authorized CAs like DigiCert or Let's Encrypt.
  • Mixed Content: Your site is HTTPS, but you are loading images or scripts via HTTP.

Benefits of Using HTTPS

On ZKB Tracking, we emphasize that HTTPS is no longer optional. It provides data encryption, preventing hackers from stealing passwords or credit card numbers. It also improves site speed through HTTP/2 and HTTP/3 support and is a confirmed ranking factor for search engines.

Frequently Asked Questions

Is Let's Encrypt safe?
Yes. Let's Encrypt is a major, trusted Certificate Authority that provides free DV (Domain Validated) certificates used by millions of sites.

What is TLS 1.3?
TLS 1.3 is the latest version of the security protocol. It is faster and more secure than older versions like TLS 1.2.

How often should I check my SSL?
We recommend checking your certificate at least once a month or setting up automated alerts to avoid unexpected expirations.