KDP Cover Rejected? 8 Common Reasons and How to Fix Them

Updated March 2026 · 6 min read · By KDP CoverLab Pro

You uploaded your cover to Amazon KDP, hit publish, and got a rejection email. It's frustrating — especially when KDP's error messages are vague. Here are the 8 most common reasons covers get rejected and exactly how to fix each one.

1. Wrong cover dimensions

This is the most common rejection. Your cover PDF must be the exact width and height that KDP expects for your specific trim size, page count, and paper type. Even being off by a fraction of an inch will trigger a rejection.

The total cover width is calculated as: bleed + back cover width + spine width + front cover width + bleed. The height is: bleed + trim height + bleed.

Fix: Use a spine width calculator to get your exact dimensions. Enter your page count, paper type, and trim size — the calculator gives you the precise width, height, and pixel dimensions at 300 DPI.

2. Resolution below 300 DPI

KDP requires all cover files to be at least 300 dots per inch. If you designed your cover in pixels without accounting for DPI, the file might look fine on screen but be too low resolution for print. A 6×9 cover at 300 DPI should be at least 3,825 × 2,775 pixels (for a typical page count).

Fix: Always design at 300 DPI from the start. If you're using a tool like Canva, make sure you set custom dimensions in pixels based on 300 DPI, not inches. KDP CoverLab Pro exports at exactly 300 DPI automatically.

3. Spine width is wrong

The spine is the narrow strip between the front and back cover. Its width depends on your page count and paper type. White paper uses a thickness of 0.002252" per page. Cream paper uses 0.0025" per page. If you calculated your spine manually and got the factor wrong, KDP will reject the file.

Fix: Use the KDP spine calculator with your exact page count and paper type. Don't round the result — use the full decimal value.

4. Text or images in the bleed zone

Bleed is 0.125 inches (3.2mm) of extra space on all four outer edges of your cover. Background colors and images should extend into the bleed, but text and important elements must stay inside the safe zone — at least 0.25 inches from the trim line.

If your title, author name, or any critical element is too close to the edge, KDP will reject it because it could get cut off during printing.

Fix: Keep all text at least 0.25 inches inside the trim line on all sides. Extend background images all the way to the bleed edge. Our cover size guide explains bleed and safe zones in detail.

5. Spine text on books under 79 pages

KDP does not allow text on the spine for books with fewer than 79 pages. The spine is simply too narrow — any text would be unreadable and could shift onto the front or back cover during printing.

Fix: If your book is under 79 pages, leave the spine as a plain color with no text or graphics. If you're close to 79 pages, consider adjusting your formatting to reach the threshold.

6. Missing barcode space

KDP automatically places an ISBN barcode on the back cover if you don't provide one. You need to leave a clear area of approximately 2 × 1.2 inches in the lower-right of the back cover for this barcode. If your design covers that area with text or a busy image, the barcode won't scan properly.

Fix: Leave the lower-right area of your back cover clear. If you're using KDP's free ISBN, don't add your own barcode — let KDP place it automatically.

7. Wrong file format

KDP accepts a single PDF for paperback and hardcover covers. The PDF must contain the back cover, spine, and front cover as one continuous image. Submitting separate front and back files, or using a format like PNG for the final upload, will cause issues.

For eBook covers, KDP accepts JPEG and TIFF files with a recommended ratio of 1.6:1 (such as 2,560 × 1,600 pixels).

Fix: Export your final paperback cover as a single PDF. For eBook covers, use JPEG or TIFF. KDP CoverLab Pro exports in PNG, PDF, JPEG, and TIFF at 300 DPI.

8. Cover doesn't match interior page count

If you change your interior manuscript after designing your cover — adding or removing pages — the spine width will no longer match. Even a difference of a few pages changes the spine calculation enough to cause a rejection.

Fix: Always finalize your interior manuscript before designing your cover. If your page count changes, recalculate the spine width and regenerate your cover file with the updated dimensions.

Quick checklist before uploading

Pre-upload checklist:
✅ Cover dimensions match your trim size + page count + paper type
✅ Resolution is 300 DPI or higher
✅ Spine width calculated with correct paper thickness factor
✅ All text is inside the safe zone (0.25" from trim line)
✅ Background extends to the bleed edge (0.125" past trim line)
✅ No spine text if under 79 pages
✅ Barcode area on back cover is clear
✅ File is a single PDF (paperback) or JPEG/TIFF (eBook)
✅ Page count matches your final interior file

Skip the guesswork

KDP CoverLab Pro calculates every dimension automatically and runs a preflight checklist before you export — so your cover passes KDP's checks the first time.

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