How to Format a Book for KDP: A Step-by-Step Guide

Amazon KDP is where most self-published authors start. The platform is straightforward, the reach is massive, and uploading a book is free. But KDP has specific formatting requirements, and getting them wrong means rejection emails, re-uploads, and books that look amateur on the shelf.

This guide walks through everything you need to format a book for KDP — both paperback (PDF) and ebook (EPUB) — from trim size selection to final export.

What KDP Expects

KDP accepts two types of files:

• Paperback interior: A print-ready PDF with embedded fonts, correct trim size, and proper margins.
• Ebook interior: An EPUB file (or a Word .docx that KDP converts to EPUB). Reflowable layout, no fixed page sizes.

The cover is a separate file. This guide focuses on the interior — the actual content of your book.

Step 1: Choose Your Trim Size

The trim size is the physical dimensions of your printed book. KDP supports a range of sizes, but most fiction and non-fiction authors use one of these:

• 5" x 8" — Common for fiction, compact and easy to hold
• 5.5" x 8.5" — Slightly larger, popular for both fiction and non-fiction
• 6" x 9" — Standard for non-fiction, business books, and longer works

Pick your trim size before you start formatting. Everything else — margins, font size, line spacing — depends on it.

Step 2: Set Your Margins

KDP has minimum margin requirements that vary by page count. The key numbers:

• Outside margin: 0.25" minimum (most books use 0.5"–0.75")
• Top and bottom margins: 0.25" minimum (most books use 0.5"–0.75")
• Inside (gutter) margin: Varies by page count — thicker books need a wider gutter so text isn't lost in the spine

For a 200–400 page book at 5.5" x 8.5", a good starting point:

• Outside: 0.625"
• Top: 0.625"
• Bottom: 0.75"
• Gutter: 0.75"

If your book is over 400 pages, increase the gutter to 0.875" or more. Check KDP's margin calculator for exact minimums based on your page count.

Step 3: Choose Your Fonts

For body text, stick with readable serif fonts designed for print:

• Garamond — The classic choice for fiction and non-fiction
• Palatino — Slightly wider, very readable
• Minion Pro — Clean and professional
• Crimson Text — A good free alternative

Font size: 10–12pt for body text depending on your trim size and font. 11pt Garamond at 5.5" x 8.5" is a safe default.

Line spacing: 1.2–1.5x the font size. Too tight and the page feels cramped. Too loose and it looks like a large-print edition.

For chapter headings, you have more freedom — sans-serif fonts, larger sizes, and decorative elements are all fair game. Just be consistent throughout the book.

Step 4: Set Up Front Matter

Front matter is everything before Chapter 1. A standard order:

1. Half title page — Just the book title, centered, no author name
2. Title page — Full title, author name, and optionally your publisher imprint
3. Copyright page — Copyright notice, ISBN, edition info, disclaimers
4. Dedication (optional)
5. Table of contents (required for non-fiction, optional for fiction)

Front matter pages typically use Roman numerals (i, ii, iii) or no page numbers at all. Arabic page numbers (1, 2, 3) start at Chapter 1.

Step 5: Format Your Chapters

Each chapter should start on a new page — specifically, on a recto (right-hand/odd-numbered) page for print books. This sometimes means inserting a blank page.

Chapter openings typically include:

• A chapter number or title (or both)
• Extra white space above the heading — dropping the first line of text about 1/3 down the page
• Optionally a drop cap on the first paragraph
• First paragraph without indentation; subsequent paragraphs indented (0.25"–0.5")

Scene breaks within chapters use a blank line, a series of asterisks, or a small ornamental glyph. Never rely on just extra white space — it's invisible at the top or bottom of a page.

Step 6: Add Running Headers and Page Numbers

Running headers appear at the top of each page, typically showing the author name on left pages and the book or chapter title on right pages. They should be in a smaller font than the body text.

Page numbers go in the footer or header, usually centered or on the outside edge. They should not appear on:

• The title page
• The copyright page
• Chapter opening pages (standard convention)
• Blank pages

Step 7: Format Back Matter

Back matter comes after your final chapter:

• Acknowledgments
• About the Author
• Also By (list of your other books — great for cross-promotion)
• Preview chapter of your next book (optional but effective for series)

Step 8: Export Your PDF for Print

When exporting your PDF for KDP paperback, make sure:

• All fonts are embedded — KDP will reject files with missing fonts
• Color space is set correctly — Use CMYK for color interiors, grayscale for black-and-white
• Bleed is set if needed — If any element (image, background color) touches the page edge, you need 0.125" bleed on all sides. Most text-only books don't need bleed.
• PDF version is 1.4 or higher — KDP's standard requirement
• File size is under 650MB — Rarely an issue for text-only books

Upload the PDF to KDP, use their previewer to check for issues, and look specifically at:

• Chapter openings (do they start on the right page?)
• Page numbers (correct sequence, absent where they should be?)
• Gutter margins (is text getting lost near the spine?)
• Image quality (if applicable)

Step 9: Export Your EPUB for Ebook

Ebook formatting is different from print. EPUB is a reflowable format — readers control the font size and screen dimensions. Your job is to provide clean structure, not pixel-perfect layout.

Key points for EPUB:

• Don't set fixed font sizes — Use relative sizes so text scales properly
• Include a table of contents — Both the NCX/nav TOC (structural) and optionally an HTML TOC page
• Use semantic markup — Headings should be actual heading tags, not just bold text
• Test on multiple devices — Check on Kindle (via Send to Kindle or Kindle Previewer), Apple Books, and at minimum one phone screen size
• Validate the file — Run it through EPUBCheck or the Kindle Previewer. Fix any errors before uploading.

Common Mistakes That Get Books Rejected

• Margins too small — KDP's minimum margins vary by page count. Check the calculator.
• Fonts not embedded — If a font isn't embedded, KDP substitutes a default. The result looks wrong.
• Wrong trim size in the file — The PDF page dimensions must exactly match the trim size you selected in KDP.
• Missing bleed — If you enabled bleed in KDP settings but your PDF doesn't have it (or vice versa), the upload will fail.
• Low-resolution images — KDP requires 300 DPI for print. Anything lower gets flagged.

A Faster Way to Do All of This

Every step in this guide — trim sizes, margins, fonts, headers, front matter, chapter formatting, PDF and EPUB export — is something that formatting software handles automatically.

Tools like Blueprint Studio let you import your manuscript, choose a professionally designed template, and export print-ready PDF and validated EPUB files without manually configuring any of these settings. The template handles margins, fonts, page numbering, chapter breaks, and front/back matter structure.

If you're formatting your first book, walking through these steps manually is a good learning experience. But for every book after that, a dedicated formatting tool saves hours of work and produces more consistent results.