SSL compliance – Please ensure all resources (including secondary resources) of a creative are SSL compliant (https). Note that a click-through URL does not need to be secure. Only applies if all creative assets are not hosted by Google Ad Manager.
Loop limitations – Loop limit of three may be requested if animation is particularly distracting to users.
Sizes: Leaderboard (728 x 90) Top banner 300x90 MPU (300x 250)
File Formats: GIF or JPG
Animation: If the ad is animated, it should continuously loop and all important information should be included on the first frame.