Will every store take your ebook cover? Check before you upload
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R. S. Breed Founder
Ebook cover rules differ a little between stores: minimum and maximum pixel sizes, file size limits, format and colour mode. Kindle, for example, wants RGB, while a print cover usually starts in CMYK, which is a common reason an ebook cover gets rejected.
The free checker tests your cover against Amazon KDP, Apple Books, Kobo, Google Play Books, Barnes & Noble Press, Draft2Digital and Lulu at once: https://bervet.com/tools/ebook-cover-checker
It also shows your cover at the sizes readers actually see it, in a list of search results, where it has about a second to work. That's often the more useful check: a title that's readable at full size can disappear at thumbnail size.
If you want one file that works everywhere: a JPEG of 1600 x 2560 pixels, in RGB, under 5 MB, meets every store's rules on the page. Make it from your full-size artwork rather than enlarging a small image.
Your cover is checked in your browser; nothing is uploaded. Free for members. If it's the wrong shape for a store, the ebook cover resizer fixes that.