Security

Mixed Content Detector

Detect HTTP resources loaded on HTTPS pages that cause mixed content issues.

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Mixed Content Detector - Find HTTP Resources on HTTPS Pages

The Mixed Content Detector helps you identify insecure HTTP resources loaded on HTTPS pages. Mixed content issues can break security, cause browser warnings, block assets, and negatively impact SEO and user trust. This tool scans a page and reports all HTTP-based images, scripts, stylesheets, iframes, and media files.

What Is Mixed Content?

Mixed content occurs when a webpage served over HTTPS loads resources over an insecure HTTP connection. Even though the page itself is encrypted, loading HTTP assets weakens security and exposes users to potential data interception and manipulation.

Why Mixed Content Is a Serious Security Issue

Modern browsers treat mixed content as a security risk. Some resources may be blocked entirely, while others trigger warnings in the browser address bar. This undermines user trust and can make your site appear unsafe.

How Mixed Content Affects SEO

Search engines prioritize secure websites. Mixed content can reduce page quality signals, harm user experience, and increase bounce rates. Blocked assets can break layouts, scripts, and tracking, indirectly impacting SEO performance.

What the Mixed Content Detector Checks

Images loaded over HTTP
JavaScript files loaded over HTTP
CSS stylesheets loaded over HTTP
Iframes using HTTP sources
Video or audio files loaded over HTTP

How the Tool Works

The tool fetches the HTML of the given HTTPS page and scans it for hardcoded http:// resource URLs. It does not rely on browser rendering or third-party APIs, making it fast and reliable for server-side analysis.

Common Causes of Mixed Content

Hardcoded asset URLs in themes or templates
Old CMS plugins or scripts
External resources that do not support HTTPS
Legacy content after HTTPS migration

Active vs Passive Mixed Content

Active mixed content includes scripts and iframes and is usually blocked by browsers. Passive mixed content includes images and media, which may still load but trigger warnings. Both should be fixed to ensure full security.

How to Fix Mixed Content Issues

Replace all http:// URLs with https:// where possible. Use protocol-relative URLs carefully or enforce HTTPS across all assets. Ensure third-party services support HTTPS and update outdated references.

When to Use This Tool

After migrating a site from HTTP to HTTPS
During security or SEO audits
When browsers show security warnings
When assets fail to load on HTTPS pages

Best Practices to Avoid Mixed Content

Always use HTTPS URLs, enable HTTPS-only modes, audit templates regularly, and use CSP headers to block insecure resource loading.

Final Thoughts

Mixed content issues are easy to miss but can have serious consequences. Regular scans help maintain security, trust, and SEO performance. The Mixed Content Detector provides a fast and effective way to find and fix these problems.

FAQ

What causes mixed content?

It is caused by loading HTTP resources on an HTTPS page.

Does mixed content affect SEO?

Indirectly yes, by harming security signals and user experience.

Will browsers block mixed content?

Active mixed content is usually blocked; passive mixed content may still load.

Can mixed content break my website?

Yes, blocked scripts or styles can break functionality.

Is HTTPS migration enough to prevent mixed content?

No, all asset URLs must also be updated to HTTPS.

Does this tool use third-party APIs?

No, it uses direct server-side analysis.

Can I scan internal pages?

Yes, any publicly accessible HTTPS URL can be scanned.

Should I fix passive mixed content?

Yes, to fully eliminate browser warnings.

Can CSP headers prevent mixed content?

Yes, Content Security Policy can block insecure resources.

How often should I check for mixed content?

After major updates, migrations, or plugin changes.

Related tools

Pro tip: pair this tool with Email Privacy Checker and Cookie Security Checker for a faster SEO workflow.