SSL Certificates Explained — What They Are and How to Check Them

SSL/TLS certificates are the foundation of secure web communication. Without one, your site shows a "Not Secure" warning in browsers, Google penalises your ranking, and users rightfully distrust it. This guide explains what SSL certificates are, what their details mean, and how to check them.

What is an SSL Certificate?

An SSL (Secure Sockets Layer) certificate — more accurately called a TLS certificate — does two things:

1. Encrypts all data between the user's browser and your server
2. Verifies that your server is who it claims to be (domain validation)

When a site has a valid SSL certificate, the browser shows a padlock icon and the URL starts with https://.

Types of SSL Certificates

Domain Validation (DV)

The most common type. Verifies you own the domain. Issued in minutes. Used by most websites and blogs. Free options: Let's Encrypt.

Organisation Validation (OV)

Verifies the organisation behind the domain. Takes 1–3 days. Used by businesses and e-commerce sites.

Extended Validation (EV)

The strictest validation — organisation is legally verified. Previously showed a green bar in browsers (now removed in most). Used by banks and major enterprises.

Wildcard certificate

Covers a domain and all its subdomains. *.example.com covers www.example.com, api.example.com, blog.example.com, etc.

Reading SSL Certificate Details

When you check an SSL certificate, here is what each field means:

Subject:    CN=eazytools.net     ← the domain this cert is for
Issuer:     Let's Encrypt R11   ← who verified and issued the cert
Valid from: 2025-01-15          ← when it became valid
Valid to:   2025-04-15          ← when it expires (renew before this!)
SANs:       eazytools.net,      ← all domains covered
            www.eazytools.net
Algorithm:  TLS 1.3             ← encryption protocol version

Why SSL Matters for SEO

Since 2014, Google uses HTTPS as a ranking signal. Sites without SSL rank lower than equivalent HTTPS sites. More importantly:

• Chrome marks HTTP sites as "Not Secure" — kills user trust instantly
• Many browsers block form submissions on non-HTTPS pages
• HTTP/2 (much faster than HTTP/1.1) requires HTTPS in all major browsers

How to Check Your SSL Certificate

Use the EazyTools SSL Checker to inspect any domain's certificate in seconds — expiry date, issuer, cipher suite, and whether the certificate chain is valid.