Everything you need to format a book for Amazon KDP in 2026, print margins and bleed, ebook specs, the correct front and back matter order, the most common rejection reasons, and a full checklist.
Key Takeaways
- KDP has separate requirements for print (a fixed-layout PDF) and ebook (a reflowable EPUB), and you need both files formatted correctly.
- Print interiors need correct trim size, gutter margins that grow with page count, and proper bleed only if you have edge-to-edge images.
- Front matter and back matter follow a conventional order, getting it wrong looks amateurish even when nothing is technically broken.
- Most KDP rejections come from a handful of fixable issues: margins, bleed mismatches, low-res images, and embedded-font problems.
- Want upload-ready KDP files with zero rejections? Call Spines Publishing USA at (708) 575-4611 or email info@spinespublishingusa.com.
Amazon KDP is the largest self-publishing platform in the world, and its formatting requirements are precise. Submit files that don't meet spec and your book gets flagged or rejected at upload, delaying your launch. Meet them cleanly and your book sails through. This checklist covers both print and ebook formatting for 2026, in the order you'll actually need it.
Print Formatting Specs (Margins, Trim Size, Bleed)
A print book interior is a fixed-layout PDF, every page is exactly as designed. The critical specs:
Trim Size
Trim size is your book's physical dimensions. KDP's most popular trim is 6" × 9" (standard for novels and non-fiction), but it supports many sizes from 5" × 8" up to 8.5" × 11". Choose a trim size standard for your genre, then format the entire interior to match it.
Margins and Gutter
Margins are where most first-timers slip. The inside margin (the gutter, near the spine) must be larger than the outside margins, and it grows with page count, because thicker books need more room near the binding. KDP's minimum gutter guidance:
| Page Count | Minimum Inside (Gutter) Margin | Outside Margins |
|---|---|---|
| 24–150 pages | 0.375 in | 0.25 in (min) |
| 151–300 pages | 0.5 in | 0.25 in (min) |
| 301–500 pages | 0.625 in | 0.25 in (min) |
| 501–700 pages | 0.75 in | 0.25 in (min) |
| 701–828 pages | 0.875 in | 0.25 in (min) |
Bleed
Bleed is only needed if you have images or color that run to the very edge of the page. If so, extend them 0.125" beyond the trim and set up a bleed document. Text-only interiors (most novels) do not use bleed. Mixing the two up is a frequent rejection cause.
Rule: text-only book = no bleed; any edge-to-edge image = full bleed on every page. Don't half-apply it.
eBook Formatting Specs
An ebook is reflowable: the text adapts to any screen size and the reader's chosen font size. That means you format with styles, not fixed layouts. KDP accepts EPUB (the modern standard) and other formats, but EPUB is recommended. For a full format comparison, see EPUB vs MOBI vs PDF. Key ebook rules:
- Use styles, not manual formatting. Define chapter headings and body text as styles; never fake layout with spaces, tabs, or hard returns.
- Insert real page breaks between chapters, never a stack of empty paragraphs.
- Build a linked table of contents (an NCX/logical TOC) so readers can navigate.
- Images at 300 dpi, RGB, and sized appropriately, low-res images look poor on high-density screens.
- No fixed indents via spaces. Use paragraph styles for first-line indents.
- Embed only licensed fonts, if any; the safest ebook approach is to let the reader's device handle fonts.
Front Matter and Back Matter Order
Professional books follow a conventional order. Getting it wrong reads as amateurish even when nothing is technically broken. The standard sequence:
| Front Matter (in order) | Back Matter (in order) |
|---|---|
| Half-title page | Acknowledgments |
| Title page | About the author |
| Copyright page | Also by the author / series list |
| Dedication | Call to action (review request, newsletter) |
| Epigraph (optional) | Excerpt from next book (optional) |
| Table of contents | — |
Ebooks often trim front matter to keep readers close to the story (the "Look Inside" sample is precious), while print editions can include the full set. Always include a proper copyright page with your ISBN.
Common Rejection Reasons
- Margins too small / gutter too narrow for the page count, the number-one print rejection.
- Bleed set up incorrectly, either missing on an image-heavy book or applied to a text-only one.
- Low-resolution images below 300 dpi that look pixelated in print.
- Fonts not embedded in the print PDF, causing text to shift or substitute.
- Mismatched trim size between the document setup and the KDP selection.
- Broken or missing table of contents in the ebook.
For a deeper dive into the errors that derail uploads, read common formatting mistakes that get manuscripts rejected.
The KDP Formatting Checklist
- Trim size chosen and applied to the whole interior
- Gutter margin sized for final page count; outside margins ≥ 0.25"
- Bleed correct for your content type (none for text-only)
- Fonts embedded in the print PDF
- Images 300 dpi (print) / RGB (ebook)
- Front matter in correct order, with a proper copyright page + ISBN
- Back matter includes a review CTA and author bio
- Ebook uses styles, real page breaks, and a linked TOC
- Previewed in KDP's online previewer on multiple device sizes
Always run your files through KDP's built-in previewer before publishing. It catches layout problems on the actual device screens readers use, your last line of defense before launch.
Want upload-ready KDP files, guaranteed?
Spines Publishing USA formats your print and ebook files to exact KDP specifications, no rejections, no rework. Call (708) 575-4611, email info@spinespublishingusa.com, or explore book formatting.
Explore Book FormattingKDP's requirements look intimidating, but they're entirely manageable once you know them. Lock your trim size, size your gutter to your page count, handle bleed correctly, order your matter conventionally, and preview before you publish. Do that and your book uploads cleanly, looking every bit as professional as a traditionally published title. Publishing wide as well? Check the spec differences in IngramSpark vs KDP.
Frequently Asked Questions
What are the KDP formatting requirements for print books?
A print interior must be a fixed-layout PDF at your chosen trim size (6×9 is most common), with embedded fonts, a gutter (inside) margin that grows with page count, outside margins of at least 0.25 inches, and bleed only if you have edge-to-edge images. Images should be 300 dpi.
What's the difference between KDP print and ebook formatting?
Print is a fixed-layout PDF where every page is exactly as designed. Ebooks are reflowable EPUB files where text adapts to any screen and font size, so you format with styles, real page breaks, and a linked table of contents rather than fixed layouts.
Why does KDP reject book files?
The most common reasons are gutter margins too small for the page count, bleed set up incorrectly (missing on image-heavy books or applied to text-only ones), low-resolution images under 300 dpi, fonts not embedded in the PDF, mismatched trim size, and a broken ebook table of contents.
What order should front matter be in?
The conventional order is: half-title page, title page, copyright page, dedication, optional epigraph, then table of contents. Ebooks often trim front matter to keep readers near the story, while print editions can include the full set. Always include a proper copyright page with your ISBN.
Do I need bleed for a KDP print book?
Only if your interior has images or color that run to the very edge of the page, in which case extend them 0.125 inches beyond the trim. Text-only interiors (most novels) do not use bleed. Applying bleed incorrectly is a common rejection cause.
