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Host-initiated Subload Detector

Upload your HTML5 Ad to check the host-initiated subload.

Check 39+ ad quality tests for ad performance — validate against IAB HTML5 ad guidelines

Go ahead, just
drop your ad !
HTML5 Zip
Ad Tag
VAST
Video
Image
Audio
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Drop your HTML5 creatives here
ZIP Archive
Validate against:
Ad Spec: IAB Ad Guidelines
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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.