How to Format a Book for Amazon KDP: The Complete 2026 Guide

Finishing a manuscript feels like reaching the finish line. Then Amazon Kindle Direct Publishing (KDP) asks about trim size, gutter, bleed, embedded fonts, and file formats—and the finish line moves.

Formatting is where many self-publishing projects stall. A book can be well written and carefully edited but still look amateurish or fail KDP’s checks because its production file has the wrong dimensions. The process becomes manageable when you make each decision in the right order.

This guide explains how to format a book for Amazon KDP in 2026. You will learn the differences between print and eBook files, how to select KDP trim sizes, how to set margins and bleed, how to export a print-ready PDF, and what to check before publishing.

Print and eBook formatting are two different jobs

A paperback is a fixed physical object. Every line, image, page number, header, and blank page stays where you place it. The interior must match the selected trim size, while its margins must allow for trimming and binding.

A standard Kindle eBook is reflowable. Readers can change the font, text size, line spacing, orientation, and screen size. It should not depend on fixed page numbers, manual spacing, or precise object positions.

Do not upload your paperback PDF as a standard Kindle eBook and expect the same experience. A PDF may suit a Print Replica eBook with a complex visual layout, but readers cannot resize its text as they can in a reflowable book.

The reliable workflow is one clean master manuscript and two purpose-built outputs: a print interior and a Kindle edition.

Make three decisions before formatting your KDP book

1. Choose the final trim size

Trim size is the width and height of the finished page. Smaller trims create more pages; larger trims create fewer pages but may feel oversized for a novel. Compare recent books in your genre. Changing trim after formatting can shift every page break, header, and image.

2. Choose ink and paper

Black ink on cream paper is common for novels. Black ink on white paper often suits nonfiction, workbooks, and diagrams. Color interiors use white paper and cost more. Availability and page-count limits vary by trim and marketplace, so confirm the live options in KDP before export.

3. Choose bleed or no bleed

Use bleed when an image, illustration, color block, or background must reach a printed edge. Choose no bleed when every element remains inside the margins. If even one interior page needs bleed, KDP says the entire manuscript file must be set up with bleed. All KDP covers require bleed; interior bleed is optional.

How to choose KDP trim sizes

The right trim depends on genre, word count, illustrations, production cost, and reader expectations.

KDP identifies 6 x 9 inches as the most common U.S. paperback size. It is a practical default for novels, memoirs, business books, and general nonfiction.

A book more than 6.12 inches wide or more than 9 inches tall is a large trim size under KDP’s current rules. Large-trim books have different printing costs. Compare the live production estimate before selecting 7 x 10, 8.5 x 11, A4, or another oversized format.

Ask four questions:

• What does the genre expect? A novel and an instructional workbook solve different reading problems.
• How long is the manuscript? A small trim can make a long book bulky; a large trim can make a short book look thin.
• Do visuals need space? Exercises, tables, and diagrams may require more width.
• What will it cost? Ink, paper, trim, and page count all affect the estimate.

Set the paper size in Word before adjusting margins. The text will repaginate, so check the page count again afterward.

How to set KDP margins and gutter in Word

Margins protect content from trimming and from disappearing into the binding. The inside margin nearest the spine is also called the gutter. It must increase as a book gets thicker.

In Microsoft Word:

Open Layout > Size > More Paper Sizes and enter the final dimensions.

Open Layout > Margins > Custom Margins.

Under Multiple pages, choose Mirror margins.

Enter inside and outside margins based on the final page count.

Apply the settings to the whole document and inspect every section.

The minimum top, bottom, and outside margin is 0.25 inch without bleed and 0.375 inch with bleed. These are technical minimums, not always ideal design choices. More generous white space often improves readability.

Word versions label binding space differently. KDP calls the required inside margin the gutter. If your dialog shows both Inside and Gutter fields, do not accidentally add the entire requirement twice. Confirm how your Word version applies the setting, then verify the result in KDP Print Previewer.

Recheck the inside margin after editing. A 298-page book and a 302-page book fall into different minimum-margin brackets.

Set KDP bleed correctly to prevent white edges

Bleed is extra artwork beyond the final trim line. It prevents a white strip when the cutting position varies slightly.

For a bleeding interior, KDP trims 0.125 inch from the top, bottom, and outside edge. Add 0.125 inch to the width and 0.25 inch to the height.

A 6 x 9-inch book with bleed is therefore 6.125 x 9.25 inches. The extra width is on the outside edge, not the binding edge. Extend background artwork through the bleed area, while keeping text and other essential content inside the safe margins.

Do not add crop marks. Upload individual pages, not two-page spreads.

Meet KDP’s technical requirements before export

Production compliance is not subjective. Run these checks before uploading your KDP paperback formatting file.

Embed every font

KDP requires fonts in the interior file to be embedded. Embedding keeps text from substituting or reflowing during processing. Use fonts licensed for embedding, remove unused fonts, and verify the exported PDF rather than assuming Word handled it correctly.

Use 300 DPI images

KDP requires interior images to have a minimum resolution of 300 dots per inch (DPI) at their final printed size and recommends no more than 600 DPI to control file size. Enlarging a small web image lowers its effective resolution; it does not create detail. An image printed 5 inches wide should be at least 1,500 pixels wide.

Keep type legible

KDP’s minimum font size is 7 points, but minimum compliance does not guarantee comfortable reading. Choose body type for the font, trim, line length, genre, and audience. Do not shrink text simply to reduce page count.

Protect the content area

Bleed elements extend beyond trim. Important elements stay inside the margins. Keep page numbers, captions, borders, footnotes, and logos away from the cut and binding areas.

Also confirm that the manuscript contains:

• Individual pages rather than spreads
• One consistent page orientation
• No passwords or security restrictions
• No comments, tracked changes, or hidden text
• Correct page order and no accidental blanks

Build a professional interior structure

Formatting should create a clear reading rhythm, not merely pass an upload check.

Arrange front matter logically

A typical print book may include:

Half-title page

Series or previous-books page

Title page

Copyright page

Dedication or epigraph

Table of contents, when appropriate

Foreword, preface, or introduction

Not every book needs every element. Fiction often omits a printed table of contents; nonfiction readers usually expect one.

Start chapters with real breaks

Use page breaks or section breaks—not repeated blank paragraphs—to start a chapter. Section breaks let you change headers, footers, or numbering without disturbing another section.

Many printed books begin major chapters on right-facing odd-numbered pages. If you follow that convention, add controlled blanks and make sure they do not show headers or page numbers.

Use styles, not manual spacing

Create styles for body text, chapter titles, subheadings, quotations, and captions. Define the body typeface, first-line indent, line spacing, paragraph spacing, alignment, and hyphenation once. Styles keep the book consistent and make revisions safer.

Do not use repeated spaces, tabs, or empty paragraphs to position text. They often fail after edits or conversion.

Control headers and page numbers

Running headers often show the author’s name on left pages and the book title on right pages. Chapter openings and blank pages normally omit them. Front matter may use Roman numerals, while the main text uses Arabic numbers.

Use section breaks and automatic page-number fields. Turn off Link to Previous where a new section needs different headers or footers.

How to format a book for Amazon KDP Kindle

Kindle eBook formatting should adapt to the reader. For novels, memoirs, and most nonfiction, use ordinary paragraphs and semantic heading styles. Let the device control body font, line height, and page dimensions.

Remove print-only elements:

• Running headers and footers
• Fixed page numbers
• Blank pages for right-hand chapter starts
• Tabs, columns, and floating text boxes
• References such as “see page 47”

Use page breaks at chapter boundaries, but do not force breaks after every short section.

Create a linked table of contents

Apply a consistent heading style to chapter titles, then build an interactive table of contents (TOC). Test every link. Nonfiction often benefits from a visible contents page; even when fiction omits it, Kindle navigation still needs a valid TOC.

Keep images flexible

Insert images instead of pasting floating Word objects. Center them, add meaningful alternative text, and avoid widths that exceed small screens. Captions should remain attached to the right image as text reflows.

Use Kindle Create for simple books

Amazon’s free Kindle Create app can import DOC or DOCX manuscripts, apply themes, detect chapters, build navigation, preview the book, and export a KPF file. It suits text-heavy books with simple layouts.

Tables, footnotes, complex illustrations, poetry with significant spacing, and educational layouts need careful testing. A hand-built EPUB may provide better control.

Export the right file for each KDP edition

Export a print-ready PDF for paperback

PDF preserves page size, typography, and image positions. Before exporting:

Resolve tracked changes and comments.

Update the TOC and page-number fields.

Confirm trim size and bleed dimensions.

Embed every font.

Preserve image quality.

Export individual pages, not spreads.

Open the PDF and inspect it outside Word.

Check the PDF’s page dimensions and font properties. Look for clipped text, shifted artwork, substituted symbols, unwanted blanks, and hairline borders.

Export EPUB, DOCX, or KPF for Kindle

KDP supports EPUB, DOC/DOCX, and KPF among its common eBook formats. EPUB offers control and broad compatibility. DOCX is convenient for simple books, although complex styling may convert poorly. KPF is created by Kindle Create for KDP.

Do not build a new 2026 workflow around MOBI. Keep your editable source and validate the final file in Kindle Previewer.

Upload, preview, and order a proof

In your KDP Bookshelf, select the ink, paper, trim, and bleed settings that exactly match the PDF. Upload the manuscript and cover, then launch Print Previewer.

Review:

• Page size and page count
• Text near the gutter or margins
• Bleed on every outer edge
• Blank pages and chapter openings
• Headers, footers, and numbering
• Image quality and cover alignment

For Kindle, preview multiple device types, orientations, and font sizes. Test the contents links, chapter breaks, images, lists, hyperlinks, and special characters.

Order a physical proof before publishing. A digital preview can flag technical issues, but it cannot tell you whether the font feels tiring, the gutter feels cramped, or the paper suits the artwork.

Common KDP formatting mistakes

• Wrong dimensions: The document is Letter or A4 while KDP expects 6 x 9, or the bleed choice does not match the uploaded file.
• Insufficient gutter: The inside margin was based on word count instead of final page count.
• Partial bleed setup: One page bleeds, but the full file was not sized for bleed.
• Missing fonts: The PDF relies on fonts that were not embedded.
• Low-resolution images: Web images or screenshots fall below 300 DPI at print size.
• Manual layout hacks: Tabs, spaces, and blank lines create unstable indents and page breaks.
• Incorrect headers: Headers appear on title pages, blank pages, or chapter openings.
• Print styling in the eBook: Fixed page numbers, columns, or floating objects break reflow.
• No physical proof: An accepted upload is mistaken for a finished product.

DIY or hire a professional book formatter?

DIY is realistic for a simple novel with no images, tables, footnotes, or unusual typography—especially if you enjoy technical work and can test patiently.

Professional formatting is usually worthwhile when a book contains photographs, exercises, tables, sidebars, poetry, endnotes, custom chapter art, or multiple editions. It also reduces risk when your launch date is fixed or you need coordinated files for Amazon KDP, IngramSpark, and Barnes & Noble Press. Approval on one platform does not automatically guarantee approval on another.

What does KDP formatting cost?

KDP does not charge an upload fee for formatting, but software, templates, and professional services may cost money. A formatter’s price usually reflects word count, layout complexity, image handling, editions, and revisions.

Compare deliverables, not only the lowest figure. Ask whether a quote includes a print-ready PDF, reflowable eBook, custom styling, image or table work, preview corrections, source files, and additional platforms.

Official KDP references

KDP changes tools and specifications. Verify your edition against the current help pages before uploading:

• Set Trim Size, Bleed, and Margins
• Paperback Submission Guidelines
• Supported eBook Manuscript Formats
• Upload and Preview Book Content