Or...better yet, dl a program that automatically sizes it for you. When printing covers from home, that is probably your best bet. But if you don't have a program or you can't find one, then like Daubs said, 4.75 in x 4.75 in at 300 DPI resolution. You can get away with 200, but 300 is better.

When sending it to a company it doesn't really matter cuz they will resize it for you.

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