UPDATED, 4-12-2014:

According to Amazon's latest publishing guidelines, all Kindle books must have an embedded ebook cover and what they call the "Marketing Cover Image," or the "Catalog Image." This "Marketing Cover Image" or "Catalog Image" is what book covers are called when Amazon displays the cover on your book page on their website, and in searches.

So, what are the perfect Amazon cover sizes? It seems that "perfect" ebook cover sizes change nearly monthly, doesn't it? Well, here's the latest scoop.

The latest specifications are:

• The preferred format for the marketing cover is an image of 2560 pixels on the longest side and 1600 pixels on the shortest side with 350 dpi to ensure image clarity on Kindle HDX devices. The image file size should be 5MB or smaller.
• If the marketing cover image size is smaller than the 2560 x 1600 recommendation, a reminder message is displayed at time of upload. Covers with less than 500 pixels on the smaller side are not displayed on the website.
• If your cover image is smaller than the recommended size, Amazon strongly recommends that you create a new image that meets the size requirements. Do not stretch the image to meet the size requirements, because this may lower the image quality.
• The content of the cover image must not:
  • Infringe another publisher’s or artist’s copyright on the same cover.
  • Mention pricing or other temporary promotional offers.

At Booknook.biz, we'll use whatever ebook covers you provide to us, but please try to ensure that your cover is as close as possible to Amazon's requested sizes and standards. Thanks!

(updated:  4/12/14).