Best KDP Coloring Book Size and Margins: The Exact Numbers
5 min read
The short answer: make your coloring book 8.5 × 11 inches, portrait. Add 0.125 inch of bleed if your art runs to the edge, keep everything important at least half an inch inside the trim, and build every page at 300 DPI. Those four numbers prevent most of the problems that get files rejected — or worse, accepted and then printed badly.
I publish my own coloring books through KDP, and I check my files against these specs every single time, because guessing at margins is how a page number or the tip of a drawing ends up sliced off by the trimmer. Here is each number, what it actually means, and the exact pixel dimensions to build at.
Quick reference
| Spec | Number | Notes |
|---|---|---|
| Trim size | 8.5 × 11 in portrait | The coloring-book standard buyers expect |
| Bleed | 0.125 in | Only if art touches the edge; page becomes 8.625 × 11.25 in |
| Safe margin | 0.5 in inside the trim | KDP's hard minimum is 0.375 in (bleed) / 0.25 in (no bleed) |
| Resolution | 300 DPI | 2550 × 3300 px (no bleed) or 2587 × 3375 px (bleed) |
Why 8.5 x 11 portrait is the size to use
For coloring books, 8.5 × 11 inches in portrait orientation is the standard, and I would not fight it. It is the size buyers expect when they picture a kids' coloring book, it gives small hands and big crayons plenty of room to work, and it leaves you a generous live area of roughly 7.5 × 10 inches per page once margins are respected. Smaller trims save nothing meaningful on printing and make every drawing feel cramped. Start at 8.5 × 11 and spend your energy on the art instead. (Storybooks are a different animal — square 8.5 × 8.5 is the classic there; see what size a children's book should be for KDP.)
The bleed math: 8.5 x 11 becomes 8.625 x 11.25
Bleed is an extra 0.125 inch of image beyond the trim line, there so the printer's cutter never leaves a white sliver at the edge of your page. You only need it if any artwork touches the page edge. If it does, your page file must be built at 8.625 × 11.25 inches — that is 8.5 plus 0.125 on the outer edge, and 11 plus 0.125 each on the top and bottom. If every page of your book has a comfortable white border around the art, which is common and perfectly fine for coloring books, you can skip bleed entirely and build plain 8.5 × 11 pages.
Safe margins: keep everything 0.5 inch inside the trim
KDP's hard minimums are 0.375 inch from the trim edge for books with bleed and 0.25 inch for books without. I treat 0.5 inch as my real rule for anything important — outlines a child is meant to color, page numbers, titles. Trimming varies slightly from copy to copy, and a half-inch buffer means that variation never touches your content. On an 8.5 × 11 page, that leaves you a live area of about 7.5 × 10 inches, which is still a big, satisfying canvas for one bold drawing per page.
Gutter margins by page count
The gutter is the inside margin, where the page disappears into the binding. It has to grow as the book gets thicker, and KDP sets it by page count:
| Page count | Inside (gutter) margin |
|---|---|
| 24 to 150 pages | 0.5 in — covers almost every coloring book |
| 151 to 300 pages | 0.625 in |
| 301 to 500 pages | 0.75 in |
Most coloring books land well under 150 pages, so 0.5 inch is the number you will actually use. Treat it as a hard boundary, not a suggestion — do not let a drawing sprawl into it, or part of the picture will curve into the spine.
Pixel dimensions at 300 DPI
Print files should be built at 300 DPI. Below roughly 250 DPI, line art starts to print visibly soft, and enlarging a small image in software does not add real detail — it just smears the softness across more pixels. Build at full size from the start:
- Without bleed: 2550 × 3300 pixels (8.5 × 11 inches at 300 DPI)
- With bleed: 2587 × 3375 pixels (8.625 × 11.25 inches at 300 DPI)
If you are generating or scanning artwork, aim for those dimensions or larger and scale down, never up.
Page count, paper, and what a copy costs to print
A KDP paperback needs at least 24 pages, and the count must be even. Coloring-book interiors print black and white on 60-pound white paper, and there is no heavier paper option for black-and-white books — which means markers will bleed through. Say so honestly in your listing ("best with crayons or colored pencils"), or lay the book out single-sided with a blank back behind every coloring page, which is marker-friendlier and doubles your printed page count. Double-sided gives more art per dollar and is the better fit for crayons.
Printing cost for an 8.5 × 11 black-and-white paperback in the US is $0.85 fixed plus $0.012 per page, so a 52-page book costs about $1.47 per copy. Your royalty is 60 percent of list price minus that printing cost: at $9.99, a 52-page book earns roughly $4.52 per sale. Typical retail for a 48-page coloring book runs $7.99 to $9.99, so the math genuinely works at normal prices. The complete walkthrough from art to published listing is in how to make a coloring book for Amazon KDP.
Final PDF checklist before you upload
- Every page exactly 8.5 × 11 in — or exactly 8.625 × 11.25 in if the book uses bleed
- All important content at least 0.5 in inside the trim on every page
- Gutter margin matches your page count (0.5 in for books up to 150 pages)
- All pages at 300 DPI — nothing upscaled from a smaller original
- Page count even, minimum 24
- KDP previewer shows zero margin warnings before you publish
Keep going
Skip the formatting entirely
Bamm Coloring Book Builder takes your own line art and handles everything on this page — trim size, margins, page order, marker-safe single-sided layout, the full-color wraparound cover, and a print-ready PDF built to KDP's specs. Build and preview your whole book free; pay $19 one time to download your ready-to-go files. You publish to your own KDP account and keep every right and royalty.
Make a coloring bookOfficial sources
About the author: Sara Larson is an early educator in the Pacific Northwest and the founder of Bamm Book Builder. She self-published her own storybook and coloring books on Amazon KDP, hit every wall on this page personally, and developed the application she wished she'd had.
Published 2026-07-11 · Last reviewed 2026-07-11. Amazon KDP specifications can change — confirm the current requirements for your selected trim size, ink, paper, and page count before publishing. Bamm Book Builder is an independent tool and is not affiliated with, endorsed by, or sponsored by Amazon.