--- title: "KDP Coloring Book Specs: Trim, Margins, Spine" description: "A reference for KDP paperback coloring book files: trim, margins by page count, bleed, 300 DPI, spine width and cover size, with worked examples." url: "https://www.superebook.ai/guides/kdp-coloring-book-specs" published: "2026-10-11" updated: "2026-10-11" --- # KDP Coloring Book Specs: Trim, Margins, Spine The numbers you need to build a KDP paperback coloring book, taken from KDP's own help pages on 2026-10-11, with worked examples for 8.5 × 11 interiors and covers. By Shri and Sarath · Published October 11, 2026 · 6 min read This is the numbers page. KDP's help pages are undated and KDP revises them, so if a figure here differs from the KDP page on the day you upload, KDP's page wins. For the process (niche, page plan, art, pricing) see [how to make a coloring book for KDP](https://www.superebook.ai/guides/how-to-make-a-coloring-book-for-kdp.md). ## Trim size and page count KDP allows custom paperback trims from 4 to 8.5 inches wide and 6 to 11.69 inches tall. A trim is classed as large if it is wider than 6.12 in or taller than 9 in, and large trims cost more to print. That makes 8.5 × 11, 8.5 × 8.5 and 8 × 10 all large trims, and 6 × 9 a regular one. | Ink and paper | Pages | | --- | --- | | Black ink, white paper | 24 to 828 | | Black ink, cream paper | 24 to 776 (listed for 5 × 8 trim) | | Standard color, white paper | 72 to 600 | | Premium color, white paper | 24 to 828 | Page counts for paperbacks on Amazon.com (KDP submission guidelines) The page count you enter in KDP is the total pages in the PDF, blank backs included. It sets your margins and your spine width. Maximums can vary by trim, so check KDP's current table for your size. ## Margins by page count Thicker books need a wider inside margin (the gutter). These are KDP's minimums. | Page count | Inside (gutter) | Outside, no bleed | Outside, with bleed | | --- | --- | --- | --- | | 24 to 150 | 0.375 in | 0.25 in | 0.375 in | | 151 to 300 | 0.5 in | 0.25 in | 0.375 in | | 301 to 500 | 0.625 in | 0.25 in | 0.375 in | | 501 to 700 | 0.75 in | 0.25 in | 0.375 in | | 701 to 828 | 0.875 in | 0.25 in | 0.375 in | Minimum margins (KDP formatting help page) These are minimums. Giving artwork more room than the minimum is a sensible habit for a coloring book, so the binding does not swallow the design, but that is advice, not a KDP rule. ## Bleed Bleed is artwork that runs past the trim edge so no white sliver shows after cutting. For the interior, KDP says to extend images 0.125 in beyond the trim on the top, bottom and outer edges. A manuscript with bleed must be a PDF. - Bleed page width = trim width + 0.125 in. - Bleed page height = trim height + 0.25 in. - For 8.5 × 11 that is 8.625 × 11.25 in, or about 2,588 × 3,375 pixels at 300 DPI. - Without bleed, KDP accepts a PDF, DOC, DOCX, RTF, HTML or TXT manuscript. Most coloring books need no bleed. A design framed inside a margin avoids it. Use bleed only for full-page patterns or backgrounds. ## Resolution and fonts - **Resolution.** At least 300 DPI for covers and manuscript images. KDP recommends staying at or below 600 DPI, as higher resolutions can cause processing delays. - **Pixels.** At 300 DPI, an 8.5 × 11 page is 2,550 × 3,300 pixels. - **Fonts.** Embed all fonts, in the interior and in the cover. KDP's minimum font size is 7 points. - **Transparency.** Flatten transparent objects and layers before publishing. - **Lines and fills.** Minimum line width is 0.75 point (0.01 in). For black ink, the minimum grayscale fill is 10%. - **File size.** The maximum is 650 MB. ## Spine width Spine width = page count × the per-page thickness of your paper. KDP gives these thicknesses. | Paper | Inches per page | | --- | --- | | Black and white, white paper | 0.002252 | | Black and white, cream paper | 0.0025 | | Premium color | 0.002347 | | Standard color | 0.002252 | Per-page thickness (KDP cover calculator help page) Spine text needs a book of more than 79 pages. KDP's page says both at least 79 and more than 79, and its Cover Creator requires 80, so use 80 or more pages if you want spine text. Keep spine text at least 0.0625 in clear on each side so it does not wrap onto the covers. Below that, leave the spine blank. ## Full cover dimensions The cover is one PDF holding the back cover, spine and front cover as a single flattened image, at least 300 DPI. KDP's bleed on the cover is 0.125 in on all sides. - Cover width = bleed + back cover width + spine width + front cover width + bleed. - Cover height = bleed + trim height + bleed. - Keep front and back cover text at least 0.125 in inside the trim lines. - Barcode: you can upload with or without one. Without your own ISBN, KDP places a barcode in a 2 × 1.2 in white box at the lower right of the back cover, so keep that area clear. - KDP recommends cover files of 40 MB or less. ## Printing cost and royalty Printing cost is a fixed cost plus the page count times a per-page cost, and a book of 24 to 110 pages pays only the fixed cost. Trim size matters (large trims cost more), while bleed settings and cover finish do not. These are KDP's Amazon.com figures for black ink on white or cream paper; other marketplaces differ (on Amazon.com.au the flat band is 24 to 108 pages) and the rates change, so use KDP's own calculator for your book. | Trim | 24 to 110 pages | Over 110 pages, up to 828 | | --- | --- | --- | | Regular | $2.30 fixed | $1.00 plus $0.012 per page | | Large | $2.84 fixed | $1.00 plus $0.017 per page | Amazon.com paperback printing cost, black ink (KDP's Paperback Printing Cost page, checked 2026-10-12) Royalty is the royalty rate times the list price, minus printing cost. On Amazon.com the rate is 60% at a list price of $9.99 and above and 50% at $9.98 and below. Expanded Distribution pays 40%. KDP also sets a minimum list price from your printing cost. ## Worked examples These use KDP's formulas with an 8.5 × 11 trim and white paper. Always confirm against KDP's cover calculator with your final page count. | Pages | Spine | Cover width | Cover height | Spine text? | | --- | --- | --- | --- | --- | | 40 | 40 × 0.002252 = 0.090 in | 0.125 + 8.5 + 0.090 + 8.5 + 0.125 = 17.340 in | 0.125 + 11 + 0.125 = 11.25 in | No, too few pages | | 80 | 80 × 0.002252 = 0.180 in | 17.430 in | 11.25 in | Yes, 80 or more | | 100 | 100 × 0.002252 = 0.225 in | 17.475 in | 11.25 in | Yes | Spine and cover size, 8.5 × 11, black ink on white paper For the 40-page book, margins fall in the 24 to 150 band: 0.375 in gutter and 0.25 in outside, top and bottom at minimum, or 0.375 in outside if you use bleed. A 100-page book on cream paper has a spine of 100 × 0.0025 = 0.25 in, which would make its cover width 17.5 in. SuperEbook exports a KDP interior PDF and a cover wrap sized to your page count, and you can start with 50 free credits. Check its numbers against KDP's own calculator before you upload. **Do this now** - [ ] Fix the trim and the total page count (blank backs included). - [ ] Look up your margins in the table for that page count. - [ ] Decide on bleed or framed designs, and size every page to match. - [ ] Place images at 300 DPI or higher; embed fonts; flatten transparency. - [ ] Calculate the spine: page count × thickness for your paper. - [ ] Calculate cover width and height, then check them in KDP's cover calculator. - [ ] Keep cover text 0.125 in inside the trim and the barcode area clear. - [ ] Upload and use KDP's previewer before ordering a proof. ## Questions **What are the minimum margins for a KDP paperback?** Inside margin is 0.375 in for 24 to 150 pages, 0.5 in for 151 to 300, 0.625 in for 301 to 500, 0.75 in for 501 to 700 and 0.875 in for 701 to 828. Outside margins are at least 0.25 in, or 0.375 in with bleed. **How wide is the spine of a KDP paperback?** Spine width is page count times the per-page thickness: 0.002252 in for black and white on white paper, 0.0025 in for cream, 0.002347 in for premium color and 0.002252 in for standard color. KDP's cover calculator gives the final figure. **What resolution does KDP require?** KDP's minimum is 300 DPI for covers and manuscript images. It recommends not exceeding 600 DPI, because higher resolutions may cause processing timeouts or delays. **How big is a KDP cover with bleed?** Width is bleed plus back cover plus spine plus front cover plus bleed, and height is bleed plus trim height plus bleed, with bleed at 0.125 in. For an 8.5 × 11 book with 80 white pages that is 17.430 × 11.25 in. **Can I add text to the spine of a coloring book?** Only if the book has more than 79 pages; KDP's Cover Creator requires 80. Keep spine text at least 0.0625 in clear on each side. With fewer pages, leave the spine blank. ## Sources Facts checked on October 11, 2026. - [KDP: Paperback submission guidelines](https://kdp.amazon.com/en_US/help/topic/G201834180): Trim range, large trim definition, page counts by paper and ink. - [KDP: Fix paperback and hardcover formatting issues](https://kdp.amazon.com/en_US/help/topic/G201857950): Margins, bleed, interior bleed page size, resolution, file formats, fonts, transparency, line width. - [KDP: Cover calculator and spine information](https://kdp.amazon.com/en_US/help/topic/G201953020): Spine formula, per-page thickness, cover formulas, safe zones, spine text minimum. - [KDP: Paperback printing cost](https://kdp.amazon.com/en_US/help/topic/G201834340): Amazon.com black-ink printing cost table, checked 2026-10-12: "Black-ink paperbacks with 24 - 110 pages only incur the fixed cost (24 - 108 pages for Amazon.com.au)". - [KDP: Paperback royalty](https://kdp.amazon.com/en_US/help/topic/G201834330): Royalty rates and the formula. - [KDP: Low-content books](https://kdp.amazon.com/en_US/help/topic/GGE5T76TWKA85DJM): Barcode box (2 × 1.2 in, lower right) when KDP supplies the barcode. ## Related - [AI coloring book generator](https://www.superebook.ai/ai-coloring-book-generator.md) - [KDP book generator](https://www.superebook.ai/kdp-book-generator.md) - [AI book generator](https://www.superebook.ai/ai-book-generator.md) - [Self-publishing cost calculator](https://www.superebook.ai/tools/self-publishing-cost-calculator.md)