When you transition your website or Blogger blog from HTTP to HTTPS, you might encounter a 'Not Secure' warning or a missing padlock icon in the browser address bar. This is known as a Mixed Content error. It happens when the initial HTML is loaded over a secure HTTPS connection, but other resources (like images, scripts, or stylesheets) are still being pulled from an insecure HTTP connection. This guide will walk you through the steps to identify and fix these errors to ensure your site remains secure.

Step 1: Identify the Insecure Resources

Before you can fix the problem, you need to know which specific files are causing the issue. Open your website in Google Chrome and right-click anywhere on the page, then select Inspect. Navigate to the Console tab. You will see red or yellow warnings that say: 'Mixed Content: The page at... was loaded over HTTPS, but requested an insecure resource...'. Take note of the URLs listed in these warnings; these are the files you need to update.

Step 2: Update Hardcoded HTTP Links in Your Template

For Blogger users, many mixed content errors come from the template's XML code. Go to your Blogger Dashboard, select Theme, click the arrow next to 'Customize,' and choose Edit HTML. Press Ctrl + F (or Cmd + F on Mac) to search for http://. Look for links to images, CSS files, or JavaScript libraries. If the external source supports HTTPS (most do), simply change http:// to https://. Be careful not to change external website links in your content, only the resources used to load your page.

Step 3: Fix Insecure Image URLs in Blog Posts

If the mixed content error points to an image within a specific post, you need to edit that post manually. Open the post in the Blogger Editor, switch to HTML View, and search for the image source tag (<img src="...">). Ensure the URL starts with https://. If the image is hosted on an old service that doesn't support HTTPS, you should re-upload that image directly to Blogger to ensure it is served securely.

Step 4: Update Third-Party Widgets and Scripts

Third-party widgets, such as hit counters, older social sharing buttons, or custom weather widgets, are common culprits of mixed content. If a widget uses an <script src="http://..."> or <iframe src="http://..."> tag, it will trigger a security warning. Check the provider's website for an updated HTTPS-compliant code snippet. If they do not offer a secure version, it is highly recommended to remove the widget to protect your site's SEO and user trust.

Step 5: Enable HTTPS Redirect in Blogger Settings

To ensure all visitors are automatically moved to the secure version of your site, you must enable the redirect feature. Go to Settings in your Blogger dashboard and scroll down to the HTTPS section. Ensure both HTTPS availability and HTTPS redirect are toggled to ON. This forces the browser to resolve any http://yourblog.com requests to https://yourblog.com, providing a final layer of security.

Step 6: Verify the Fix with a Site Audit

After making these changes, clear your browser cache and refresh your site. The padlock icon should now appear. To be thorough, use a free online tool like Why No Padlock? or JitBit SSL Check. These tools crawl your site and confirm that every single element—including background images and external scripts—is being delivered over a secure SSL connection.

💡 Pro Tip: Keep your software updated to avoid these issues in the future.