300×250 pixels. You can create an ad by selecting Build New Creative in the ad form, then filling out the form that appears. When uploading a book cover to the creative builder, use a cover image that is 115 pixels wide to ensure the best possible image quality. Alternatively, you can select Upload Existing Creative and submit a .png, .jpg, or .jpeg image. If you upload a very large image, the size will be reduced, which can negatively affect the quality of the image, so please aim to upload at the 300×250 size. Also note that you cannot use an animated .gif file.
Updated on March 10, 2019
Was this article helpful?
Need more help?
Can’t find the answer you’re looking for? Get in touch with our team!Email support