Standard Online Banner Ad Sizes
Online banner ads have standard sizes to accommodate horizontal, vertical, rectangular, and square advertisement areas. The standard banner ad sizes are as follows:
Horizontal Online Banner Ad Sizes
Vertical Online Banner Ad Sizes
Rectangular Online Ad Banner Sizes
Square Online Ad Banner Sizes
When developing a web site that will display banner ads, design the layout using these standard sizes. If you will be advertising your banners on other web sites, create versions of your banner ad from each of the standard size categories listed above.
Here is a template to get you started.