KDP Rejected Your Book Cover? Here Is Why, and How to Fix It

You uploaded your paperback cover to Amazon KDP and it came back flagged. The message tells you something is wrong, but not always what to change. The good news is that the reasons are few and predictable, and almost every one of them comes down to a measurement.

This guide walks through each common reason a KDP cover is rejected, the rule behind it as KDP states it, and how to fix it. If you would rather hand the file to someone, there is a short section on that at the end.

How KDP checks your cover

A paperback cover is not just the front. KDP asks for a single PDF that includes the back cover, spine and front cover as one image. The width of that file depends on three things: your trim size, your page count and your paper. When the file does not match the size your book needs, or breaks one of the placement rules, the upload is flagged and you are asked to fix it.

That is why a cover can look perfect and still fail. The problem is rarely the design. It is the geometry.

The common reasons, and the fix for each

1. The cover is the wrong size

The full cover width is the bleed, plus the back, plus the spine, plus the front, plus the bleed again. The height is the trim height plus bleed at the top and bottom. A cover sized for the wrong trim, or built from a template for a different book, will not match.

Fix: work out the exact size for your trim and page count. The free KDP cover calculator does this and gives you a template to design on.

2. The spine does not match your page count

The spine width is your page count multiplied by the thickness of your paper. For black and white interiors that is 0.002252 inch per page on white paper and 0.0025 inch on cream, so the same book has a different spine on each. The most common trap is formatting the interior after the cover is made: the page count changes, the spine changes, and the cover no longer fits.

Fix: take the final page count from your finished interior, recalculate the spine, and do not round the result. The KDP cover size guide has the full table.

3. There is no bleed

KDP asks you to add 0.125 inch (3.2 mm) to the top, bottom and outside edges of the cover. Anything in that strip is trimmed off, so the background has to run into it, or a thin white line can appear at the edge of the printed book.

Fix: extend the background art past the trim line on every outside edge.

4. Text is too close to the edge

KDP asks that text sits at least 0.125 inch (3.2 mm) inside the trim lines. Titles, author names and blurbs placed right up against the edge risk being cut.

Fix: move every piece of text and every logo inside the safe area, with comfortable room to spare.

5. Spine text on a thin book

KDP only allows spine text when the book has at least 79 pages, and it asks for at least 0.0625 inch (1.6 mm) of space between the spine text and each edge of the spine. A thin book with a title on the spine is a classic rejection.

Fix: remove the spine text if your book is under 79 pages, or keep it well inside the spine if it is over.

6. Low resolution images

KDP asks for images placed at a minimum of 300 DPI. A cover made for a screen often falls short: a 1024 pixel image stretched across a six inch front cover works out at about 171 DPI. It may look fine on your monitor and still print soft.

Fix: rebuild the cover from artwork that is large enough for the final printed size. Raising the DPI number in an editor changes the label, not the image.

7. Something is in the barcode area

If you do not supply a barcode, KDP places one on your back cover. If your blurb, an author photo or important artwork sits where it goes, the result looks wrong or the file is flagged.

Fix: keep the lower part of the back cover clear. If you have your own ISBN, you can make a barcode with the free ISBN barcode generator.

8. Fonts and transparencies

KDP asks you to embed your fonts and flatten all transparencies. Unflattened transparencies can print with missing or distorted content.

Fix: export a flattened PDF with the fonts embedded.

9. The file is too large

KDP notes that cover files larger than 650MB will not convert, and recommends keeping them at 40MB or less.

Fix: export at the correct size and resolution rather than far above it.

Why an ebook cover is not a print cover

An ebook only needs the front. A paperback needs the whole wrap: a back cover with your blurb, a spine sized to your page count, and the front, all in one file with bleed. Many rejections happen because a front cover made for Kindle was simply stretched into a paperback template.

If you already have a front cover you are happy with, the missing pieces are the spine and the back cover. That is a job on its own: back cover and spine design for your existing front cover.

If your cover was made with AI

AI image tools are good at ideas and poor at print files. Their images are often too small for 300 DPI at print size, their lettering is painted rather than typeset, and they make a single front image with no spine or back cover at all. KDP also asks you to declare AI generated content when you publish.

The guide to fixing an AI generated book cover covers each of those problems in detail.

A quick check before you upload again

• The cover is one PDF with the back, spine and front together.
• The size matches your trim size and your final page count.
• The background runs into 0.125 inch of bleed on the top, bottom and outside edges.
• All text sits at least 0.125 inch inside the trim lines.
• There is no spine text if the book has fewer than 79 pages.
• Images are at least 300 DPI at their printed size.
• The barcode area on the back cover is clear.
• Fonts are embedded and transparencies are flattened.

Want it fixed for you?

If you would rather not rebuild the file yourself, I fix covers for KDP and IngramSpark by hand. You see a watermarked proof before anything is final. Nobody can promise that KDP will accept a file, but fixing the problems above removes the usual reasons it is rejected.

Frequently asked questions