Vertical video ads are video ads displayed in a vertical way that fulfill the screen of a mobile device.
Vertical video has a 9:16 aspect ratio, while landscape video has a 16:9 aspect ratio and square video has a 1:1 aspect ratio. Almost all videos are landscape, as they were optimized for movies and television.
Buffer did an A/B testing comparing square video and vertical video, and vertical video outperformed square video in all of the experiments.
Since last year, vertical video ads are available on YouTube. Vertical video ads are also available on Instagram and Facebook.