KDP Bleed, Trim Size & Margins Explained (2026)
Most KDP rejections come down to three concepts: bleed, trim size, and margins. They're not hard — just precise. Here's the 2026 formatting guide that gets files approved on the first upload.
Trim size — your book's final dimensions
Trim size is width × height after the printer cuts the pages. A '6 × 9' book is 6 inches wide, 9 inches tall. Choose first, because manuscript page size, margins, cover dimensions, and printing cost all flow from it.
Defaults: fiction & most nonfiction 6 × 9, compact novels 5 × 8, memoirs 5.5 × 8.5, workbooks/coloring 8.5 × 11, children's picture 8.5 × 8.5 or 8 × 10. Pick yours, then download KDP's free manuscript template for that exact trim — it pre-sets page size and margins for you.
Bleed — extra image area past the trim
Bleed is 0.125" (3.2 mm) of extra image area extending past the trim on the top, bottom, and outer edges. It exists because cutting machines can be off by up to 0.0625" — bleed prevents a thin white sliver from appearing at the edge.
Set your manuscript page size 0.25" taller (0.125" top + 0.125" bottom) and 0.125" wider (outer edge only — the inner/spine edge gets no bleed). You only need bleed if any image, color, or background touches the edge of the page.
Margins — the safe zone for your content
Margins are the empty border between your content and the trim line. KDP requires minimums but readable books exceed them. Typical safe margins: outside, top, bottom ≥ 0.5" (0.375" minimum), plus a gutter (inside) that grows with page count to keep text out of the spine curve.
Gutter — the inside margin that depends on page count
Gutter minimums (KDP 2026): 24–150 pages = 0.375", 151–300 = 0.5", 301–500 = 0.625", 501–700 = 0.75", 701–828 = 0.875". Under-sizing the gutter is the #1 rejection cause — text disappears into the spine on thick books. Always round up.
Bleed, trim & margin specs for the most popular trims
5 × 8: manuscript page with bleed = 5.125 × 8.25, minimum margins 0.375 outer/top/bottom + gutter by page count.
5.5 × 8.5: page with bleed = 5.625 × 8.75. 6 × 9: page with bleed = 6.125 × 9.25. 7 × 10 workbook: page with bleed = 7.125 × 10.25. 8.5 × 11 workbook/coloring: page with bleed = 8.625 × 11.25.
Formatting checklist before you upload
Page size matches trim (+ bleed if used). Gutter sized for final page count. All text inside safe area (≥0.375" from trim). No image stops exactly at trim — it either stays inside the safe area or bleeds 0.125" past. PDF embeds all fonts. Export at 300 DPI for images. Single PDF, no spreads, no crop marks.
Frequently asked questions
- Do I need bleed for my KDP book?
- Only if any image, color, or background touches the page edge. Pure-text interiors do not need bleed.
- Why did KDP reject my file for 'content outside margins'?
- Usually the gutter is too small for the page count, or text was placed inside the 0.375" safe-area buffer. Re-set the gutter and reflow.
- What trim size should I choose?
- 6 × 9 is the safest default for fiction and most nonfiction. Match your genre's convention — readers expect it, and printing cost is predictable.
- Can I change trim size after publishing?
- Not on the same listing — you'd need to republish as a new book with a new ISBN. Choose carefully the first time.
Paired calculator
KDP Royalty Calculator
Put this guide into practice with the matching free calculator.
Try the KDP Royalty Calculator →Related Guides
How KDP Royalties Work
How Amazon KDP royalties are calculated for paperbacks, hardcovers, and Kindle eBooks.
Read guide →How Many Books Do You Need to Sell to Hit Your KDP Income Goal?
Work backward from a dollar goal to the number of books you actually need to sell — with realistic expectations.
Read guide →How To Design Amazon KDP Covers That Sell
What separates KDP covers that sell from ones that get scrolled past — and how to design one even without a designer.
Read guide →
Related Calculators
KDP Advertising ROI Calculator
ROI, net profit, and cost per sale for Amazon Ads campaigns on KDP books.
Try calculator →KDP Book Launch Calculator
Total launch cost, expected ROI, and break-even sales for a new KDP book.
Try calculator →KDP Break-Even Calculator
Sales needed to recover your KDP publishing costs.
Try calculator →
Compare Alternatives
KDP vs Draft2Digital
Amazon exclusivity vs wide distribution — ebook publishing compared.
Compare →KDP vs IngramSpark
Amazon reach vs bookstore distribution — self-publishing platforms compared.
Compare →IngramSpark vs. KDP: Print Cost & What You Keep
Reconcile dollars-per-copy on KDP and IngramSpark — print cost, wholesale discount, and break-evens.
Compare →
Troubleshooting
Why Is My Profit Lower Than Expected?
Revenue is up, but profit isn't. The gap is almost always one of five hidden leaks — fees, returns, shipping, COGS drift, or unpaid owner time. Find which one is eating you.
Read fix →
Case Studies
KDP Book Launch: Spend More on Ads or Improve the Cover?
A self-published romance author has $600 left in launch budget. The book is ranking but not converting — should that money go to more Amazon Ads or to a professional cover redesign?
Read case study →
Recommended Downloads
KDP Bleed & Trim Cheat Sheet
A beginner-friendly reference for common KDP book sizes and bleed setup.
Open resource →Amazon KDP Categories Explained
Understand how Amazon KDP categories work, how to pick the right ones, and how to use them to rank, get visibility, and win bestseller badges.
Open resource →How Many KDP Books Do You Need To Make $1,000 Per Month?
A clear, beginner-friendly breakdown of how many KDP books you need to publish — and at what royalty rate — to reliably earn $1,000 per month.
Open resource →