There are different formats known as standard banner size. The standards evolved from guidelines several market leaders worked out in early days. Of course, everybody is free to define their own formats but we recommend you design your banners in standard formats to correspond with most advertisers. You may want to take the graphics (right click and "save to disk") we created to see what they look like in your website design. The size of ad units is defined in pixel - width x height. Set the values of your image to the respective format when you start designing your banner.
We list the most popular formats. You may identify other formats surfing the web. Have a look at your favorite websites to get some impressions what banner size they are using.
