Manifest.json Checker

Upload Your HTML5 Ad to check if the Zip contains a manifest.json file.

Check 42+ ad quality tests for ad performance — validate against IAB and Google HTML5 ad guidelines

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Manifest.json

A manifest.json in an HTML5 creative is a metadata file that defines the ad's assets, dimensions, and entry point.

Why do we test it?

It ensures the ad server correctly identifies, loads, and displays the creative by providing essential information like size, main HTML file, and click tags, reducing errors and manual setup.