Responsive display ads need the following sizes: Landscape (1.91:1): 1200 628 (min required: 600 314, max file size: 5120KB). Square: 1200 1200 (min required: 300 300, max file size: 5120KB).

Responsive Google Ads\n\n Horizontal rectangle visual: required aspect ratio is 1.91: 1, the minimum size is 600 x 314 (recommended size: 1200 x 628).