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Whether you’re working on a mass-market non-fiction memoir or self-published indie thriller, deciding on the cover design and size for your book can be a difficult decision. As a writer, its reasonable to think more about the content of your book and less about the front book cover and back cover dimensions and designs—but those things will eventually be important. If terms like width ratio, PPI, and EPUB sound like a foreign language, don’t stress. Whether you’re working with a book designer or are self-designing, here are some tips to help you choose a cover size for both standard print and ebook publishing.