Mixed Content Checker
Find HTTP resources loading on an HTTPS page, the kind that trigger browser warnings or get silently blocked. Free, no account needed.
3 free checks per day. No signup needed.
What gets scanned
This tool fetches the page and scans its HTML for the common resource-loading tags, images, scripts, stylesheets, iframes, video, audio, and embeds, that reference a plain http:// URL. It's a single-page scan of what's directly in the HTML, not a full crawl, and it doesn't inspect CSS url() references or scripts that construct URLs at runtime.
Frequently asked
What is mixed content?
When an HTTPS page loads a resource over plain HTTP. Browsers block the highest-risk kinds outright and warn on lower-risk ones, since an HTTP resource can be intercepted or altered in transit even on an otherwise secure page.
Why does mixed content happen on a site that's already using HTTPS?
Usually leftover hardcoded http:// URLs from before the site migrated, or a third-party embed, ad, or old CDN link that was never updated to https://.
Related tools: SSL Certificate Checker ·HTTP Security Headers Checker