File-types
.JPG, .GIF, .PNG, 3. parts tags or HTML*
Formats
930×180
300×250
320×160
320×320
(All measurements are in pixels (width x height))
Weight
Max. 120 KB for each banner
If you use HTML or tags, you are able to polite-load up to 1 MB extra or 3 MB if the user clicks on the banner
*Clicktag
You need to code in a Google clicktag if you use HTML or tags, please use this guide: Google clicktag guide