Ad banner sizes range from the small to large. Definition of ad banner sizes include "horizontal", "vertical", "skyscraper", "square" and other descriptions. The most accurate way to convey ad banner sizes remains using its pixel dimensions, and is usually represented as width by height. An ad banner size of "180 x 150" means 180 pixels wide and 150 pixels tall.
The following are the most typical ad banner sizes used for online advertising purposes. The ad banner size for a Web site or a mobile site will vary so be sure to first to confirm the accepted size.