Image / HTML5

File size: max 100 kb

Format: jpg, gif, png, html5 or 3rd party script

Html5 guidelines: https://support.google.com/admanager/answer/7046799?hl=en

 

Video

Video format (.mp4, h264, no audio)

File size: max 1 mb

 

Wallpaper

Template: PSD / JPG

File size: max 400 kb

Format: jpg, png