PowerPoint isn't a good tool to use if you really want a professional-looking cover. If you're doing it yourself, you need a real image manipulation program (Gimp is free) and at least a basic understanding of how to use it effectively to create good designs. Amazon KDP allows you to input everything into their Cover Creator or download a template with all the right guidelines based on your page number. If you're not at all familiar with how to make these types of calculations, use KDP—you need to have a cover that looks good, but they'll figure out all the technical details based on your selections.

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