How to Fix WordPress Mixed Content Errors After Installing SSL
Installing an SSL certificate is one of the most important steps you can take to improve the security and credibility of a WordPress website. Once SSL is installed, your website should load using HTTPS instead of HTTP.
However, many WordPress website owners discover that their site still shows a “Not Secure” warning, a mixed content warning, broken images, missing styles, or other display problems even after installing SSL.
This problem is commonly known as a WordPress mixed content error.
The good news is that mixed content errors are usually straightforward to fix once you identify the HTTP resources causing the problem. In this guide, you will learn what mixed content is, why it happens after installing SSL, how to identify the affected resources, and several ways to fix the problem safely.
What Is a WordPress Mixed Content Error?
A mixed content error occurs when a WordPress website is loaded over a secure HTTPS connection but still requests some resources through an insecure HTTP connection.
For example, your website may correctly load as:
https://example.com
But an image, stylesheet, JavaScript file, font, video, or other resource may still be loaded using:
http://example.com/image.jpg
This creates a mixture of secure and insecure resources.
Modern browsers can detect this problem and may block some resources or display security warnings.
A properly configured WordPress website should use HTTPS consistently for its pages and the resources they load.
Why Does Mixed Content Happen After Installing SSL?
Installing an SSL certificate does not automatically change every old HTTP URL stored inside your WordPress database.
For example, before SSL installation, your website may have stored image URLs like:
http://example.com/wp-content/uploads/image.jpg
After installing SSL, the correct URL should be:
https://example.com/wp-content/uploads/image.jpg
Old HTTP URLs can exist in several places, including:
- WordPress database content
- Images
- Theme files
- CSS files
- JavaScript files
- Plugins
- Widgets
- Custom HTML
- External resources
- Hard-coded URLs
- CDN configurations
- Embedded videos and media
This is why simply installing an SSL certificate may not completely resolve the problem.
How to Check for WordPress Mixed Content Errors
Before changing anything, it is useful to identify exactly which resources are still using HTTP.
1. Check Your Browser
Open your website using HTTPS and look for a security warning in your browser.
You can also open the browser’s developer tools and check the Console tab.
A mixed content warning may identify the HTTP resource responsible for the problem.
For example, you might see a message indicating that an HTTP image, script, stylesheet, or other resource was requested from an HTTPS page.
2. Check Your Website Source
Right-click on the affected page and select View Page Source.
Search for:
http://
If your website is supposed to be completely HTTPS, unexpected HTTP URLs may indicate potential mixed content.
Be careful, however, because not every occurrence of http:// necessarily represents an error. Some URLs may appear inside scripts, metadata, or third-party services without actually causing mixed content.
3. Test Important Pages
Do not check only the homepage.
Test important sections of your website, including:
- Homepage
- Blog posts
- Pages
- Contact page
- Login page
- Product pages
- Category pages
- Images
- Forms
- Embedded videos
A single plugin or theme component may introduce HTTP resources only on particular pages.
How to Fix WordPress Mixed Content Errors
Once you identify the HTTP resources, you can begin fixing them.
1. Make Sure WordPress Uses HTTPS
The first thing to check is your WordPress URL configuration.
Go to:
WordPress Dashboard → Settings → General
Look for:
WordPress Address (URL)
and:
Site Address (URL)
Both should normally use HTTPS, for example:
https://example.com
rather than:
http://example.com
Save the changes if they are incorrect.
If you cannot access these settings, the URLs may also be defined in your wp-config.php file.
Always create a backup before modifying configuration files.
2. Replace Old HTTP URLs in the WordPress Database
One of the most common causes of mixed content is old HTTP URLs stored in the WordPress database.
For example, your content may contain:
http://example.com/wp-content/uploads/photo.jpg
when it should contain:
https://example.com/wp-content/uploads/photo.jpg
You can use a reputable search-and-replace solution to update old URLs.
Before performing a database-wide replacement, create a complete backup of your WordPress files and database.
This is especially important because an incorrect search-and-replace operation can modify URLs that should not be changed.
3. Use a WordPress SSL Plugin
A WordPress SSL or HTTPS management plugin can help identify and resolve certain HTTPS configuration problems.
Some plugins can detect insecure resources and assist with HTTPS redirects or mixed content.
However, plugins should not be treated as a substitute for properly updating your website’s URLs.
After using an SSL plugin, clear your cache and test the website again.
4. Check Your Theme
Your WordPress theme can sometimes contain hard-coded HTTP URLs.
For example, a theme file might contain something similar to:
http://example.com/wp-content/themes/mytheme/style.css
That resource should normally be loaded through HTTPS.
If the problem comes from a theme, check the theme’s settings and files.
If you are not comfortable editing PHP, CSS, or JavaScript files, avoid making direct changes to the live website. Instead, contact your developer or theme provider.
5. Check Your Plugins
Plugins can also introduce mixed content.
This can happen with plugins that load:
- JavaScript
- CSS
- Images
- Fonts
- Videos
- External APIs
If the mixed content warning identifies a particular plugin URL, check whether the plugin has an HTTPS or site URL setting.
Make sure the plugin is updated to its latest compatible version.
If necessary, temporarily disable plugins one at a time to determine which one is responsible.
Do this carefully, preferably on a staging website rather than a busy production website.
6. Check Images and Media
Images are one of the most common sources of mixed content.
For example:
http://example.com/wp-content/uploads/2026/10/image.jpg
should normally become:
https://example.com/wp-content/uploads/2026/10/image.jpg
Old image URLs may exist in posts, pages, widgets, sliders, galleries, or theme settings.
If only certain posts display mixed content warnings, inspect the images and embedded media within those posts.
7. Check External Resources
Your website may also load resources from external websites.
These can include:
- Google Fonts
- Advertising networks
- Analytics services
- Social media widgets
- Video platforms
- CDN services
- Payment services
- Third-party JavaScript libraries
If an external resource is still being loaded through HTTP, check whether the provider supports HTTPS.
If an HTTPS version is available, update the resource URL.
If the third-party service does not support HTTPS, you may need to remove it or replace it with a secure alternative.
8. Force HTTPS Redirects
After fixing the underlying mixed content, configure your website so visitors who enter the HTTP version are redirected to HTTPS.
For example:
http://example.com
should redirect to:
https://example.com
Your hosting provider, control panel, WordPress configuration, or server configuration may provide options for HTTPS redirects.
A redirect ensures that visitors and search engines are directed to the secure version of your website.
However, remember that a redirect alone does not fix mixed content inside an HTTPS page. You still need to update the HTTP resources.
Clear Your WordPress Cache
After making HTTPS changes, clear your website cache.
Depending on your setup, you may need to clear:
- WordPress caching plugin
- Hosting cache
- CDN cache
- Browser cache
- Server cache
If you use a CDN such as Cloudflare or another caching service, purge the relevant cache after making significant URL changes.
Then reload your website and check the browser console again.
Check Your SSL Certificate
If your website continues to display security problems after fixing mixed content, verify that the SSL certificate itself is correctly installed.
Make sure:
- The certificate covers your domain
- The certificate is valid
- HTTPS loads correctly
- There are no certificate errors
- Your main domain and preferred URL are configured consistently
If HTTPS itself is not working correctly, contact your hosting provider or SSL provider before troubleshooting mixed content further.
Common Mistakes to Avoid
When fixing WordPress mixed content errors, avoid making large changes without a backup.
Some common mistakes include:
Changing URLs without creating a backup
Always back up your database and website files before performing a large search-and-replace operation.
Installing multiple SSL plugins unnecessarily
Using several plugins that perform similar HTTPS functions can create configuration conflicts.
Changing HTTP URLs manually everywhere
Large WordPress websites can contain thousands of URLs. A controlled search-and-replace process is usually more efficient than manually editing every page.
Ignoring third-party resources
Your own website may be fully configured for HTTPS while an external script, image, font, or advertising resource continues to load through HTTP.
Forgetting the cache
You may fix the problem but continue seeing the old version because your browser, WordPress cache, hosting server, or CDN is serving cached content.
How to Prevent Mixed Content Errors in the Future
Once your website is fully HTTPS, keep it that way.
When adding new images, scripts, stylesheets, videos, or external services, make sure they support HTTPS.
Also consider the following best practices:
- Keep WordPress updated.
- Keep themes and plugins updated.
- Use reputable plugins.
- Monitor website security.
- Keep regular backups.
- Use HTTPS URLs consistently.
- Check important pages after major website changes.
- Review browser console warnings when troubleshooting.
- Test staging changes before applying them to a live website.
Frequently Asked Questions
Does installing SSL automatically fix mixed content?
No. SSL encrypts HTTPS connections, but old HTTP URLs stored in WordPress content, themes, plugins, or databases may still need to be updated.
Is mixed content dangerous?
Mixed content can weaken the security of an HTTPS page and may cause browsers to block certain resources. It can also result in broken images, scripts, styles, or other website functionality.
Will mixed content affect SEO?
A mixed content problem is primarily a security and technical issue, but unresolved HTTPS configuration problems can negatively affect user experience and site quality. Maintaining a properly configured HTTPS website is therefore an important part of technical SEO.
How do I know which file is causing mixed content?
Open your browser’s developer tools and check the Console tab while loading the affected page. The browser will often identify the insecure HTTP resource.
Can a WordPress plugin fix mixed content?
Some plugins can help identify or resolve HTTPS-related problems, but the best long-term solution is to correct the underlying HTTP URLs and configuration.
Final Thoughts
A WordPress mixed content error after installing SSL is usually caused by resources that are still being loaded through HTTP instead of HTTPS. The problem can come from your database, images, theme, plugins, custom code, or external services.
Start by confirming that your WordPress and Site URLs use HTTPS. Then identify the HTTP resources using your browser’s developer tools, update old URLs carefully, check your theme and plugins, and configure proper HTTPS redirects.
Most importantly, create a complete backup before making database or configuration changes.
Once the old HTTP resources have been corrected, clear your caches and test the website again. A properly configured HTTPS website provides visitors with a more secure browsing experience while giving you a stronger foundation for website maintenance and technical SEO.
