SSL Certificates Explained: Why Your Website Says Not Secure

You open your website in Chrome and there it is — a gray “Not Secure” label sitting right next to your URL. Visitors see it too, and many of them leave immediately. In fact, studies show that up to 85% of online shoppers will abandon a website that lacks a secure connection. If your website says “Not Secure,” you are bleeding traffic, trust, and revenue every single day. The fix is straightforward: you need an SSL certificate. But what is SSL, exactly? How does it work? And how do you get that reassuring padlock icon back in the browser bar? In this guide, we break it all down in plain English — no networking degree required. Key Takeaways

• SSL (Secure Sockets Layer) encrypts data between your visitor’s browser and your server, keeping information private.
• Browsers display “Not Secure” on any site that loads over HTTP instead of HTTPS.
• Google has confirmed HTTPS as a ranking signal — SSL directly impacts your SEO.
• Free SSL certificates from Let’s Encrypt make encryption accessible to every small business.
• Mixed content warnings can persist even after installing SSL if some resources still load over HTTP.
• Certificate renewal is critical — an expired SSL certificate triggers alarming browser warnings.

What Is SSL (and TLS)?

SSL stands for Secure Sockets Layer. It is a security protocol that creates an encrypted connection between a web server and a browser. When SSL is active, data traveling between the two — passwords, credit card numbers, form submissions — is scrambled so that no one can intercept and read it. You may also see the term TLS (Transport Layer Security). TLS is simply the updated, more secure version of SSL. The industry technically uses TLS today, but everyone still calls it “SSL” out of habit. When someone says “SSL certificate,” they almost always mean a TLS certificate. The visible result of an active SSL certificate is the padlock icon in your browser’s address bar and the URL switching from http:// to https:// — that extra “s” stands for “secure.”

Why Your Website Says “Not Secure”

Starting in 2018, Google Chrome began marking all HTTP websites — sites without SSL — with a “Not Secure” warning. Firefox, Safari, and Edge followed suit. The reason is simple: any data sent over plain HTTP travels in readable text. Anyone on the same network could theoretically intercept it. Here are the most common reasons your website displays the “Not Secure” warning:

• No SSL certificate installed. Your site is still loading over HTTP.
• SSL certificate has expired. Certificates have a lifespan (typically 90 days to one year) and must be renewed.
• Mixed content issues. Your site loads over HTTPS, but some images, scripts, or stylesheets still use HTTP URLs.
• Incorrect SSL configuration. The certificate is installed but not properly linked to your domain.

If you are unsure where your site stands, an SEO audit will identify SSL issues alongside other technical problems holding your site back.

How SSL Encryption Works: A Simple Analogy

Think of SSL like sending a locked briefcase through the mail. You and the recipient each have a key, but no one else does. Even if someone intercepts the briefcase in transit, they cannot open it. Here is the simplified technical process, called the SSL handshake:

1. Browser says hello. Your visitor’s browser connects to your server and asks for identification.
2. Server responds. Your server sends back its SSL certificate, which contains a public encryption key.
3. Browser verifies. The browser checks that the certificate is valid and issued by a trusted authority.
4. Encryption begins. The browser and server agree on a shared session key, and all data is now encrypted.

This entire handshake happens in milliseconds. Your visitors never notice it — they just see the padlock and know they are safe.

Types of SSL Certificates: DV, OV, and EV

Not all SSL certificates are the same. There are three main types, each offering a different level of validation:

Type	Full Name	Validation Level	Best For	Cost
DV	Domain Validated	Confirms domain ownership only	Blogs, small sites	Free – $50/yr
OV	Organization Validated	Verifies domain + business identity	Business websites, e-commerce	$50 – $200/yr
EV	Extended Validation	Rigorous business verification	Banks, large enterprises	$100 – $500/yr

For most small businesses, a DV certificate is perfectly sufficient. It provides the same level of encryption as an EV certificate. The difference is in the identity verification process, not the security of the connection itself. If you run an e-commerce store processing payments, an OV certificate adds a layer of business verification that can build customer confidence. EV certificates were once prized for showing the company name in the browser bar, but most browsers no longer display that distinction.

Free SSL with Let’s Encrypt

Here is the good news: you do not need to pay for SSL. Let’s Encrypt is a nonprofit certificate authority that provides free DV certificates. Most quality hosting providers — including SiteGround, Cloudflare, and many managed WordPress hosts — offer one-click Let’s Encrypt installation. Why would anyone pay for SSL when free options exist? Paid certificates sometimes include:

• Warranty coverage in case of a security breach
• Organization or extended validation
• Dedicated customer support
• Longer validity periods (though Let’s Encrypt auto-renews every 90 days)

For a standard small business website, a free Let’s Encrypt certificate delivers the same encryption, the same padlock icon, and the same SEO benefit as a paid DV certificate.

How to Install SSL on WordPress

Installing an SSL certificate on a WordPress site typically involves a few steps:

Step 1: Obtain the Certificate

Check your hosting control panel. Most hosts provide a free SSL option under a “Security” or “SSL/TLS” section. Enable it for your domain.

Step 2: Update WordPress URLs

In your WordPress dashboard, go to Settings → General and change both the WordPress Address and Site Address from http:// to https://.

Step 3: Set Up Redirects

Add a 301 redirect so all HTTP traffic automatically forwards to HTTPS. You can add this to your .htaccess file: RewriteEngine On RewriteCond %{HTTPS} off RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Step 4: Fix Mixed Content

Use a plugin like Really Simple SSL or Better Search Replace to update internal links and media URLs from HTTP to HTTPS throughout your database.

Step 5: Verify

Visit your site in an incognito browser window and confirm the padlock appears on every page. If this process feels overwhelming, our web design services include full SSL setup and configuration so you never have to worry about it.

Mixed Content Warnings and How to Fix Them

You installed SSL, updated your URLs, and yet some pages still show a warning. The culprit is almost always mixed content — your page loads over HTTPS, but individual resources (images, fonts, scripts, or CSS files) still reference HTTP URLs. Browsers handle mixed content in two ways:

• Mixed passive content (images, videos): The browser may still load these but will not show the padlock.
• Mixed active content (scripts, stylesheets): The browser blocks these entirely, which can break your site’s layout or functionality.

How to find and fix mixed content:

1. Open Chrome DevTools (F12) and check the Console tab for mixed content warnings.
2. Use an online tool like Why No Padlock or Jitbit SSL Checker to scan your site.
3. Update hardcoded HTTP URLs in your theme files, widgets, and plugin settings.
4. Run a search-and-replace on your database to change remaining http://yourdomain.com references to https://yourdomain.com.
5. Check third-party embeds (Google Maps, YouTube, social widgets) and update their embed codes to HTTPS.

Mixed content is one of the most common issues we uncover during a technical review. It is also one of the easiest to fix once you know where to look. For a full rundown of security best practices, see our Website Security Checklist.

SSL as a Google Ranking Factor

Google officially confirmed HTTPS as a ranking signal back in 2014. While it started as a lightweight factor, its importance has grown alongside Google’s broader push for a safer web. Here is what we know:

• HTTPS is a confirmed ranking signal. Google has stated this publicly and reinforced it multiple times.
• All else being equal, HTTPS wins. If two pages are identical in quality and relevance, Google will prefer the HTTPS version.
• Chrome usage data matters. With Chrome holding roughly 65% of the global browser market, the “Not Secure” warning directly impacts user behavior — and user behavior signals feed back into rankings.

SSL alone will not launch you to page one, but lacking it puts you at a measurable disadvantage. For a deeper dive into how HTTPS affects your search visibility, check out our coverage on HTTPS for SEO in our Technical SEO series.

How to Check If Your SSL Is Properly Configured

Installing the certificate is only half the job. A misconfigured SSL can still cause warnings, errors, or security gaps. Here is how to verify everything is working:

1. SSL Labs Server Test (ssllabs.com/ssltest): Enter your domain and receive a detailed grade from A+ to F. Aim for an A or higher.
2. Check certificate details in your browser: Click the padlock icon → “Certificate” to view the issuer, validity dates, and covered domains.
3. Verify all pages redirect: Manually test http://yourdomain.com, http://www.yourdomain.com, and their HTTPS counterparts. All should resolve to a single HTTPS URL.
4. Scan for mixed content: Use the tools mentioned above to confirm every resource loads securely.
5. Test on multiple browsers: Occasionally, a certificate works in Chrome but throws errors in Safari or Firefox due to missing intermediate certificates.

Running these checks after any server migration, hosting change, or major site update will save you from unpleasant surprises. Our Complete Security Guide covers these checks alongside the broader security practices every site owner should follow.

Certificate Renewal: Do Not Let It Lapse

SSL certificates expire. When they do, browsers display a full-page warning that tells visitors your site may be dangerous — far worse than the small “Not Secure” label. This can tank your traffic overnight. Renewal best practices:

• Enable auto-renewal. Let’s Encrypt certificates auto-renew every 90 days if configured correctly. Most hosting providers handle this automatically.
• Set calendar reminders. For paid certificates with annual renewal, set a reminder 30 days before expiration.
• Monitor your certificate. Free tools like UptimeRobot or Oh Dear can alert you if your SSL certificate is nearing expiration or has already lapsed.
• Test after renewal. Confirm the new certificate is active and properly installed — renewal failures do happen.

An expired certificate is not just a trust issue — it is an SEO emergency. Google will de-index pages it cannot crawl securely, and regaining those rankings takes time.

Frequently Asked Questions

Is SSL the same as HTTPS?

Not exactly. SSL (or more accurately, TLS) is the security protocol that encrypts data. HTTPS is the result of applying that protocol to your website — it is HTTP with SSL/TLS encryption layered on top. You need an SSL certificate to enable HTTPS on your site.

Do I need SSL if my website does not collect payments or personal data?

Yes. Browsers mark all HTTP sites as “Not Secure” regardless of what data you collect. Beyond that, Google uses HTTPS as a ranking factor, so skipping SSL hurts your search visibility. Every website — even a simple blog — benefits from an SSL certificate.

How long does it take to install an SSL certificate?

With a modern hosting provider, enabling a free Let’s Encrypt certificate takes just a few minutes. The additional steps — updating URLs, fixing mixed content, and setting up redirects — can take anywhere from 30 minutes to a few hours depending on the size and complexity of your site.

Will installing SSL break my website?

It should not, but mixed content issues can cause images to disappear or stylesheets to stop loading if some resources still reference HTTP URLs. This is why it is important to run a thorough check after installation and fix any mixed content warnings before considering the migration complete. Tired of seeing “Not Secure” on your website? eSEOspace handles SSL installation, mixed content fixes, and ongoing certificate management so your site stays secure and trusted. No more browser warnings, no more lost visitors. Contact eSEOspace today to get your site locked down.