Amazon KDP Book Cover Requirements in 2026: Sizes, Specs & Common Mistakes
Everything you need to know about Amazon KDP book cover requirements — dimensions, resolution, file formats, bleed, spine width, and common rejection reasons. Plus how to get it right the first time.
Why Your Cover Specs Matter More Than You Think
You can have the most gorgeous book cover ever designed, but if it doesn't meet Amazon KDP's technical requirements, it's getting rejected. And nothing kills momentum like uploading your book at 2 AM only to get a vague error message about "cover dimensions."
Here's every spec you need to know, laid out clearly so you can get it right the first time.
Kindle eBook Cover Requirements
Amazon's requirements for Kindle eBook covers are straightforward but specific:
Dimensions:
File format: JPEG or TIFF
File size: Under 50 MB
Color space: RGB (not CMYK — that's for print)
DPI: 300 DPI recommended, though Amazon will accept 72 DPI at minimum dimensions
The 2,560 x 1,600 pixel size isn't just a suggestion. Covers at this resolution look sharp on high-DPI tablet screens and in Amazon's "Look Inside" feature. Going with the bare minimum 1,000 pixels means your cover will look fuzzy on modern devices — and fuzzy covers don't sell books.
KDP Paperback Cover Requirements
Paperback covers are more complex because you're designing a full wrap — front, spine, and back cover as a single image.
File format: PDF only (with fonts embedded)
Resolution: 300 DPI minimum
Color space: CMYK recommended for accurate color reproduction, though RGB is accepted
Bleed: 0.125 inches (3.175 mm) on all sides
Calculating Your Cover Dimensions
This is where most authors get tripped up. Your paperback cover dimensions depend on three things:
Spine width formula:
- White paper: page count × 0.002252"
- Cream paper: page count × 0.0025"
Full cover width calculation:
```
Bleed (0.125") + Back Cover Width + Spine Width + Front Cover Width + Bleed (0.125")
```
Full cover height calculation:
```
Bleed (0.125") + Trim Height + Bleed (0.125")
```
Example for a 6" × 9" book with 300 pages on white paper:
- Spine width: 300 × 0.002252" = 0.676"
- Full width: 0.125 + 6 + 0.676 + 6 + 0.125 = 12.926"
- Full height: 0.125 + 9 + 0.125 = 9.25"
- At 300 DPI: 3,878 × 2,775 pixels
KDP's Cover Calculator
Don't want to do math? Amazon provides a cover calculator and template generator that will give you exact dimensions and even a downloadable PNG template with guidelines for safe zones, spine placement, and bleed areas.
Use it. Seriously. It's the single best way to avoid rejection.
KDP Hardcover Requirements
Hardcovers follow similar rules to paperbacks but with a few differences:
Case laminate (printed cover):
- 0.625" wrap on all edges (instead of 0.125" bleed)
- Spine width calculation differs — use KDP's calculator
- Minimum 75 pages, maximum 550 pages
Cloth cover with dust jacket:
- Requires separate jacket file
- Includes front and back flaps
Hardcovers have tighter requirements overall, so the cover calculator is even more essential here.
Common Reasons KDP Rejects Covers
Based on the most frequent complaints in author forums, here's what gets covers bounced:
1. Wrong Dimensions
The most common rejection. Your cover doesn't match the trim size and page count you specified. Even being off by a few pixels on a paperback wrap can trigger a rejection.
2. Missing or Incorrect Bleed
If your artwork doesn't extend to the bleed edge, you'll get white strips along the edges of your printed book. Always extend background colors and images past the trim line by at least 0.125".
3. Text Too Close to the Edge
KDP recommends keeping all text at least 0.25" from the trim edge (not the bleed edge). Text that gets cut off during printing is the author's problem, not Amazon's.
4. Low Resolution
Anything under 300 DPI for print will look pixelated. This is especially common when authors upscale a small web image.
5. Barcode Placement
KDP automatically adds a barcode to the back cover. If you place your own barcode or put critical content in the barcode zone (bottom-right of the back cover), it'll get covered up.
6. Spine Text on Thin Books
Books under 79 pages (white paper) or 65 pages (cream paper) can't have spine text — the spine is too narrow to print legibly. KDP will reject covers with spine text on thin books.
7. Misleading Content
Fake bestseller badges, fake review quotes, or using another author's name prominently will get your cover — and possibly your account — flagged.
How to Make Sure Your Cover Passes
A few practical tips:
Use Amazon's template. Download it from the cover calculator, layer it over your design, and make sure everything lines up before uploading.
Preview thoroughly. KDP's previewer shows you exactly how your cover will print. Check the spine alignment, look for text getting cut off, and verify colors look reasonable.
Keep it simple on the spine. Title and author name only. Decorative elements on a spine rarely look good at the final printed size.
Test with a proof copy. Before going live, order a proof. Screen colors lie. A physical proof shows you exactly what readers will hold in their hands.
The Easy Route: Let AI Handle the Specs
If all of this feels like a lot of technical fiddling, that's because it is. This is exactly why tools like AIBookArt exist — you describe what you want, and the AI generates covers that are already properly sized and formatted for Amazon KDP.
No calculating spine widths. No worrying about bleed zones. No CMYK conversion headaches. You get a cover that's ready to upload, and you can focus on what actually matters: writing your next book.
The eBook covers come out at the right dimensions for Kindle, and if you need a full paperback wrap, you're working with properly formatted output from the start.
Quick Reference Cheat Sheet
| Spec | Kindle eBook | KDP Paperback | KDP Hardcover |
|------|-------------|---------------|---------------|
| Format | JPEG/TIFF | PDF | PDF |
| Min Resolution | 72 DPI | 300 DPI | 300 DPI |
| Recommended | 2,560 × 1,600 px | Use calculator | Use calculator |
| Color Space | RGB | CMYK preferred | CMYK preferred |
| Bleed | None | 0.125" | 0.625" wrap |
| Max File Size | 50 MB | 650 MB | 650 MB |
Final Thoughts
Getting your cover specs right is unglamorous but essential. A rejected cover wastes time, and a cover that technically passes but looks blurry or misaligned on Amazon's store page costs you sales.
The good news: once you understand the requirements, it's mechanical. Follow Amazon's guidelines, use their calculator for print covers, and always preview before publishing. Or skip the technical hassle entirely and use a tool that handles it for you.