Size specific Custom Image File Sizes and FormatsAd Slot DimensionsCustom Image DimensionsFile Format728x90 px (desktop)1140x180 pxHTML, JPG, GIF, PNG300x50, 320x50 px and 414x125 px (mobile)570x375 pxHTML, JPG, GIF, PNG980x55 px*110x55 pxHTML, JPG, GIF, PNG970x250 px*952x500 pxHTML, JPG, GIF, PNG