Why Formatting Matters More Than Ever
Amazon KDP's automated review system has become significantly stricter in 2026. Before your book even reaches a human reviewer, its software scans for bleed settings, margin violations, image resolution, and font embedding. A single failed check means a rejection email and a 48-72 hour delay. Getting it right the first time is essential.
Step 1 — Choose Your Trim Size Before You Write a Single Page
Your trim size dictates your margin requirements, and your margins define your usable text area. Changing trim size after formatting is a disaster — reflowing text, resizing images, and fixing widows takes hours.
| Format | Trim Size | Best For |
|---|---|---|
| Standard Paperback | 6" x 9" | Novels, memoirs, non-fiction |
| Compact | 5" x 8" | Literary fiction |
| Large Print | 8.5" x 11" | How-to, workbooks |
| Square | 8" x 8" | Children's, photography |
Our Recommendation
Start with 6"x9" unless you have a specific reason not to. It has the widest distribution support and the lowest print cost per unit.
Step 2 — Set Your Margins Correctly
KDP's margin requirements depend on page count. The gutter (inside margin) must be larger to account for the binding. Bleed is required if any element — image, color block, or background — touches the page edge.
- Top: 0.75"
- Bottom: 0.75"
- Outside: 0.5"
- Gutter (up to 150 pages) = 0.375"
- Gutter (151-400 pages) = 0.5"
- Gutter (401-600 pages) = 0.625"
- Gutter (over 600 pages) = 0.75"
Step 3 — Typography That Reads Beautifully in Print
Screen fonts and print fonts are not the same. Proven body text fonts for print include Garamond, Palatino Linotype, Georgia, and Minion Pro. Use 11pt-12pt body size, 1.3x-1.5x line spacing, and 0.2"-0.3" paragraph indents with no blank line between paragraphs.
Step 4 — Image Resolution and Embedding
Every image in your interior must be at least 300 DPI at its final print size. Export your PDF as Press Quality or PDF/X-1a, embed all fonts, and use Grayscale for B&W interiors or CMYK for color. Do NOT flatten transparency.
Step 5 — The Final Preflight Checklist
- Correct trim size set in document
- All margins follow KDP specifications
- Bleed added if any content touches page edge
- All fonts embedded in PDF
- Images are 300 DPI or higher at print size
- No content in the gutter area
- Page numbers on all relevant pages
- PDF file size is under KDP's 650 MB limit
Common Rejection Reasons and How to Avoid Them
- Fonts not embedded — Export as PDF/X-1a or enable font embedding in your PDF export settings
- Images below minimum resolution — Replace low-DPI images with higher resolution sources
- Content too close to the trim edge — Increase your outside margin
- Bleed required — Add 0.125" bleed if any element extends to the page edge