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Video Letterboxing Detector
Scan your VAST Video to check if the video has black bars.
Check 37+ ad quality tests for ad performance — validate against IAB VAST ad guidelines
Video Letterboxing
Letterboxing is the practice of adding black bars at the top and bottom to change the aspect ratio of a video, while preserving the aspect ratio of the original video.
Why do we test it?
Letterboxing is not appreciated by most publishers, as it's not a great user-experience, nor does it use make full use of the ad unit's available space.