Your Blogger site opens over HTTPS, but a browser still reports insecure content or refuses to load a script, image, or embedded widget. This is often called a mixed content problem: the main page uses a secure connection while one or more resources are requested through insecure HTTP.
The right fix is to find the specific insecure resource and replace it with a secure alternative. Turning off HTTPS for the whole blog is not a sensible first step.
What mixed content means
A page using https:// should load its resources securely too. An image tag, script, stylesheet, or iframe pointing to http:// can create mixed content.
Modern browsers handle resource types differently: some media requests may be upgraded to HTTPS automatically, while more dangerous active content such as scripts is generally blocked when requested insecurely. The MDN mixed-content reference explains those distinctions.
Step 1: Confirm Blogger HTTPS is enabled
Go to Blogger → Settings → HTTPS and review the available settings. For a custom domain, certificate availability can take time after DNS changes. Use Google's Blogger HTTPS instructions if the blog itself cannot open securely.
If the main page works on HTTPS but one embedded resource fails, focus on that resource instead of changing the domain configuration.
Step 2: Find the insecure request
Open the affected published page in a desktop browser and use its developer tools. Look at the Console or Security panel for messages mentioning mixed content, insecure requests, or blocked resources. Record the exact URL and resource type.
For example, if the error refers to http://assets.example.com/widget.js, the issue is the script request—not necessarily the article text. Do not copy unfamiliar error logs or private tokens into public tools.
Step 3: Check the post HTML for old links
In Blogger's post editor, switch to HTML view and search for src="http:// and href="http://. Focus on image, video, script, iframe, and stylesheet references.
If the same domain supports HTTPS, test the secure resource URL directly before replacing it. Do not assume every HTTP address will work by changing one letter; the external server must actually support a valid HTTPS connection.
Step 4: Inspect theme widgets and custom scripts
If the warning appears on many posts, the source may live in the theme or a shared Layout gadget rather than the article itself. Download a theme backup, find the problematic reference, and replace only that reference after verifying the secure alternative.
Old third-party counters, ads, social widgets, and embedded forms can be common sources. If the provider has no secure version, remove or replace the widget rather than forcing browsers to load insecure code.
Step 5: Test images and iframes separately
Some image requests may be automatically upgraded by the browser, but that behavior can vary with the resource and URL. Use the provider's official HTTPS image link when available. For embedded videos or forms, get the provider's current secure embed code. If you are replacing article graphics, follow the basic image optimization checklist for bloggers as well.
Never turn an untrusted site into a script source simply because the link is HTTPS. A secure transport does not guarantee that the code is safe.
Step 6: Verify the page after fixing it
- Save the smallest necessary change.
- Reload the published page over HTTPS.
- Check the browser's console for the original warning.
- Test on mobile and inspect any interactive widget that was changed.
- Check a few other posts if the edited resource came from the shared theme.
If the specific warning disappears and the page functions properly, stop. Avoid a broad search-and-replace across every URL in the theme without reviewing which resources those links represent.
Common mistakes
- Disabling HTTPS instead of fixing an insecure resource.
- Changing every
http://string without testing the destination. - Replacing a trusted widget with an unknown third-party script.
- Assuming mixed content and an invalid TLS certificate are identical problems.
- Editing an article when the error comes from a global theme gadget.
- Judging success only by the padlock icon instead of testing the affected feature.
Frequently asked questions
Can one HTTP image cause a mixed-content warning?
Yes. Browser handling varies by resource type, but it is best to use a verified HTTPS image URL when possible.
Why is a JavaScript widget missing only on HTTPS?
The browser may block an insecure script request. Find the script URL in developer tools and check whether the provider offers a secure embed.
Should I edit the Blogger theme?
Only if the insecure resource actually comes from theme code or a shared gadget. Back up the theme and make a targeted correction.
Is mixed content the same as a custom-domain redirect error?
No. Mixed content involves resources loaded within an HTTPS page; redirect loops involve repeated URL changes before the page loads.
Final checklist
Keep HTTPS enabled, identify the exact insecure request, replace it with a verified HTTPS resource or remove it, and retest the live page. Fix the cause rather than hiding the browser warning.