In 2025, having an SSL certificate is not a “bonus” feature—it is the absolute baseline for running a website.
If your WordPress site still loads over HTTP instead of HTTPS, browsers like Chrome and Safari will explicitly label your site as “Not Secure” in the address bar. This destroys user trust immediately. Furthermore, Google uses HTTPS as a ranking signal, meaning unsecured sites rank lower in search results.
But installing a certificate is only step one. Many WordPress sites have SSL installed but are still insecure due to misconfiguration, weak protocols, or “Mixed Content” errors.
In this guide, we will cover everything you need to know about SSL/TLS, how to implement it correctly on WordPress, and how to verify your encryption is actually working.
What is SSL/TLS?
SSL (Secure Sockets Layer) and its modern successor, TLS (Transport Layer Security), are protocols that establish an encrypted link between a web server and a browser.
Without SSL, data sent between the browser and the server (like passwords, credit card numbers, or contact forms) is sent in plain text. Anyone on the same Wi-Fi network or an ISP could theoretically intercept and read that data.
With SSL, that data is encrypted. Even if intercepted, it looks like gibberish.
Note: We still commonly say “SSL,” but technically, we are all using TLS 1.2 or TLS 1.3. Old SSL protocols (SSL v3, TLS 1.0, TLS 1.1) are now considered insecure and should be disabled on your server.
Why You Need HTTPS for WordPress
1. Security & Data Integrity
It prevents “Man-in-the-Middle” (MITM) attacks where attackers modify data in transit (e.g., injecting malicious ads or stealing session cookies).
2. Trust & Credibility
The padlock icon is a universal sign of trust. If a user sees “Not Secure,” they are likely to leave immediately, increasing your bounce rate.
3. SEO Ranking
Google has used HTTPS as a ranking signal since 2014. In 2025, it is virtually impossible to rank on page 1 for competitive keywords without it.
4. Performance (HTTP/2 & HTTP/3)
Modern web performance protocols like HTTP/2 (which makes sites load significantly faster) require an encrypted connection. If you don’t have SSL, your site is forced to use the slower HTTP/1.1 protocol.
Types of SSL Certificates
Not all certificates are created equal, though for encryption purposes, they work the same way.
| Type | Validation Level | Best For | Cost |
| Domain Validated (DV) | Checks if you own the domain via email or DNS. | Blogs, Small Business, Portfolios | Free (Let’s Encrypt) to $10/yr |
| Organization Validated (OV) | Vets the organization’s legal existence. | Corporate sites, NGOs | $50 – $200/yr |
| Extended Validation (EV) | Strict vetting of the legal entity. | Banks, Large E-commerce | $150+ /yr |
Recommendation: For 99% of WordPress sites, a free Let’s Encrypt (DV) certificate is perfect. It provides the same level of encryption as an expensive EV cert.
How to Properly Move WordPress to HTTPS
Installing the certificate on your hosting panel is not enough. You must tell WordPress to use it.
Step 1: Update WordPress Settings
Go to Settings → General and update both URLs to use https://:
- WordPress Address (URL):
https://yoursite.com - Site Address (URL):
https://yoursite.com
Step 2: Force HTTPS (Redirect HTTP to HTTPS)
You need to ensure that if someone types http://yoursite.com, they are automatically redirected to the secure version.
For Apache (.htaccess):
Add this code to the top of your .htaccess file:
Apache
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>
For Nginx:
Update your server block:
Nginx
server {
listen 80;
server_name yoursite.com www.yoursite.com;
return 301 https://yoursite.com$request_uri;
}
Step 3: Fix “Mixed Content” Errors
This is the most common issue. “Mixed Content” happens when your site loads over HTTPS, but an image, script, or stylesheet is still hardcoded to load over HTTP.
The Symptom: The padlock icon disappears or shows a warning triangle.
How to Fix:
- Identify: Use the Chrome Developer Tools (F12) → Console tab. Red errors will list the insecure resources.
- Fix Database: Do not manually edit every post. Use a plugin like Better Search Replace to find
http://yoursite.comand replace it withhttps://yoursite.comin your database tables.
Checking Your SSL Health with FunSentry
Installing an SSL certificate is a “set and forget” task for many, which leads to expired certificates or weak configurations.
FunSentry’s SSL Scanner performs deep checks on your configuration:
- Expiration Check: Alerts you if your certificate is expiring soon (crucial for Let’s Encrypt’s 90-day cycle).
- Chain Validation: Ensures your “Intermediate CA” certificates are installed correctly (browsers hate broken chains).
- Protocol Security: Checks if your server still supports obsolete protocols like SSLv3 or TLS 1.0.
- Mixed Content Scanner: Crawls your homepage to identify insecure HTTP resources.
Summary Checklist
| Task | Status | Why |
| Install Certificate | ✅ | Encrypts data in transit. |
| Update WP Settings | ✅ | Tells WordPress to generate HTTPS links. |
| Force HTTPS (301) | ✅ | Redirects all traffic to the secure version. |
| Fix Mixed Content | ✅ | Ensures the padlock stays green. |
| HSTS Header | Optional | Advanced security (tells browsers to never use HTTP). |
| Auto-Renewal | ✅ | Prevents downtime (Let’s Encrypt renews every 60-90 days). |
Is your padlock lying to you?
Just because you have SSL doesn’t mean your configuration is secure. Run a free scan at FunSentry to verify your TLS protocol versions, check for mixed content, and ensure your site is using modern encryption standards.