KDP Cover Image Resizer
Drop your cover art and get it back at exactly the pixels KDP wants — Kindle’s 1.6:1 shape, or a paperback’s full wrap with the spine and bleed worked out for you.
Your cover never leaves this device. The resize happens here in your browser — no upload, no account, and no copy on our servers. The one exception is the Book Studio button, and only if you press it. If the page itself hits an error we send a report about the error — never your file.
An eBook cover and a print cover are different objects
A Kindle cover is one rectangle at a fixed 1.6:1 shape. A paperback cover is a single flat wrap — back, spine and front side by side, with a bleed margin all round that the trimmer cuts away. They are not two sizes of the same file, and the commonest way to get a rejection is to upload one where the other belongs.
The print dimensions here are computed, not looked up: your trim size and page count give the spine, and the bleed is added on every outside edge — the same calculation, from the same module, as the KDP cover calculator on this site, so the two cannot disagree about the same book. Use the calculator when the question is what size and you want the numbers, the spine width and a downloadable guide; use this page when you already have the artwork and want the file.
A conforming file is not an approval
Hitting the right pixels gets your cover past the uploader. It does not make the text legible at thumbnail size, keep the title clear of the spine fold, or satisfy the content rules — those are still yours. When the layout is what you are unsure of, the Book Studio cover editor draws the spine and bleed guides on the canvas so you can see what the trimmer will take.
Frequently asked questions
What size should a Kindle eBook cover be?
KDP asks for a height-to-width ratio of 1.6:1 and at least 1,000 pixels on the longest side; the size it calls ideal is 1600 × 2560. The ratio matters more than the pixel count — a cover at the right size but the wrong shape is what the store letterboxes with bars down the sides.
Why does the paperback size ask for a page count?
Because a print cover is one flat image covering back, spine and front, and the spine's width comes from how many pages the book has. Change the page count and the file's dimensions change with it. That is also why a print cover has to be made after the interior is final, not before.
Where do these numbers come from?
The same formula the KDP cover calculator on this site uses — the per-page paper thickness for your stock, plus the 0.125 in bleed on every outside edge. The two tools read one implementation, so they cannot give you different answers for the same book.
Will resizing make my cover blurry?
It can, and the tool will not pretend otherwise: nothing here invents detail. Going down in size is safe and often improves sharpness. Going up stretches what you have — if your art is smaller than the target, the honest answer is a bigger original, and the upscaler on this site is the only thing that adds real detail rather than guessing.
Is my cover uploaded?
No. The resize happens on your own device, and the file never reaches a server — there is no account and no copy of your artwork anywhere but your machine. The one exception is the Book Studio button, and only if you press it.
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