When running a google ad there are certain sizes that you may need to use.
These graphics will help to attract more users to your ad.
Rectangle Minimum size: 600 x 314 pixels. Recommended size: 1200 x 628 pixels. Max size: 4096 x 4096 pixels.
Square Minimum size: 300 x 300 pixels. Recommended size: 1200 x 1200 pixels. Max size: 4096 x 4096 pixels.
Logo Minimum size: 128 x 128 pixels. Recommended size: 1200 x 1200 pixels. Max size: 4096 x 4096 pixels.