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

Image

Audio

smart_display settings_system_daydream panorama

Drop your video ads here

MP4, WebM, MOV, AVI, MPG, 3GP

Validate against:

Ad Spec: IAB Ad Guidelines

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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.