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Video Letterboxing Detector

Upload your video ad to check if the video has black bars.

Check 24+ ad quality tests for ad performance — validate against IAB video ad guidelines

Go ahead, just
drop your ad !
HTML5 Zip
Ad Tag
VAST
Video
Banner
smart_display settings_system_daydream panorama
Drop your video ads here
MP4, WebM, MOV, AVI, MPG, 3GP

Video Letterboxing

Letterboxing occurs when a video does not match the display aspect ratio, causing black bars to appear on the top/bottom or left/right side the frame.

Why do we test it?

Video ads should aim to fit the intended display dimensions without letterboxing, as it can detract from the viewer's experience and reduce the visual impact of the ad. Detecting letterboxing ensures the ad maintains a professional appearance across platforms.