KDP Cover Sizes Explained
What goes into a KDP paperback cover size — and how to mock yours up in one click.
Trim size + spine + bleed
A full KDP paperback cover is made of three things: the trim size (your finished book’s width and height), the spine width (which grows with your page count and paper type), and bleed on the outer edges. Because the spine depends on your exact page count, the full-cover dimensions are different for every book.
| Use case | Size | Aspect | Notes |
|---|---|---|---|
| Paperback front cover, 6″×9″ trim | 1800×2700px · 300 DPI | 2:3 | Front cover only at 300 DPI. The full wrap (back + spine + front) depends on page count — use the KDP cover calculator. |
Verified 2026-06-13 against the official KDP paperback cover guidelines. For the full wrap including your spine width, use the KDP cover calculator.
Preview your cover free
Upload your front cover and see it as a paperback or hardcover — clean PNG, no watermark.
FAQ
What determines a KDP paperback cover size?
A KDP paperback cover is your trim size (the finished book dimensions) plus the spine width — which depends on your page count and paper type — plus bleed on the outer edges. Amazon provides an official cover calculator that outputs the exact full-cover dimensions for your book.
How do I preview my cover before publishing?
Upload your front cover to our book cover mockup generator and download a clean 1x PNG — no watermark, no signup — to check how it reads as a thumbnail before you publish.
Does the mockup tool change my print file?
No. The generator only creates a preview image; it never touches or uploads your real print-ready PDF. Use Amazon’s cover calculator for the exact print dimensions.