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Video Letterboxing Detector

Scan your VAST Video to check if the video has black bars.

Collect 37+ data points and validate against IAB ad guidelines

HTML5 Zip
Ad Tag
VAST
Video
Image
Audio
 
auto_stories
API Docs
Go ahead, try
it yourself !

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.