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Host-initiated Subload Detector

Scan your ad tag to check the host-initiated subload.

Check 32+ ad quality tests for ad performance — validate against IAB display ad guidelines

Go ahead, just
copy/paste your tag !
HTML5 Zip
Ad Tag
VAST
Video
Banner

Load Size: Subload

After the ad appears, it might load more data in the background. This is called a subload.

Why do we test it?

While subloading can add more features to an ad (like animations), too much subloading can make the ad run slower. Keeping subloads light helps the ad run smoothly without affecting the user's browsing experience.