The source – support.google.com
In order to ensure continuous delivery of your ads, Google recommends that you check in advance and modify the graphics in your ad campaigns if necessary.
Soon, all graphics that do not meet the criteria will stop showing and will be automatically removed from ad groups and no longer displayed in reports.
Requirements for which advertisers must validate images:
- Image aspect ratio: 1.91: 1, 1: 1 or 4: 5.
- The minimum size is 600x314, 200x200 and 320x400, respectively.
- It is forbidden to use GIF graphic files: only JPG and PNG formats will be supported.
You can crop previously uploaded images in your Google Ads account.