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

You have written and edited your book. Now comes the step that quietly trips up more first-time authors than any other: formatting it so Amazon KDP actually accepts it and it looks professional in a reader's hands. Get this wrong and you face upload rejections, or worse, a printed book with cramped margins and text disappearing into the spine.

The thing to understand before anything else is that KDP needs two different files for two different jobs. This guide walks both. If you have not yet uploaded to KDP, it fits between the writing and the publishing steps in our guides on how to self-publish a book and how to publish a book on Amazon KDP — this is the deep-dive on getting your files right.

Ebook and print are two different jobs

You cannot use one file for both, because the two formats work in opposite ways:

• The ebook is a reflowable EPUB (or a clean Word DOCX that KDP converts). The text rearranges itself to fit any screen and any font size the reader chooses. You are formatting structure, not fixed pages.
• The print book is a print-ready PDF with embedded fonts, a fixed trim size, and precise margins. Nothing reflows, so every measurement has to be exact.

Get comfortable with that split and the rest of this guide makes sense. We will do the shared setup first, then each file.

Step 1: Choose your trim size first

Trim size is the physical dimensions of your printed book, and you choose it before you format anything, because every other measurement depends on it.

• 6" x 9" is the safe default for most fiction and non-fiction — it looks professional and prints economically.
• 5" x 8" suits compact, pocket-style fiction.
• Larger sizes suit workbooks and children's books.

Pick your trim size, then build your interior to match it. Changing it later means reformatting the entire book — this is the single most common formatting mistake, so decide it now.

Step 2: Set your margins and gutter

Margins are what keep your text from running into the spine or the edge of the page. For print, you need mirrored margins, where the inside edge (the gutter) gets extra space so text is not swallowed by the binding.

The catch: the gutter has to grow with your page count — a 500-page book needs more inside margin than a 150-page one, because a thicker book has a tighter spine. As a rough guide, expect at least around three-quarters of an inch on the inside, scaling up from there. (KDP specifies exact minimum margins by page count — check the current requirement for your page count before you finalize, as these can change.)

Step 3: Choose readable fonts and embed them

Resist the urge to get creative here. Professional books use clean, readable serif fonts for body text — the kind that disappear into readability rather than calling attention to themselves — usually between 10 and 12 point.

• Use two fonts maximum: one for body text, one for headings. More than that reads as amateur.
• Your chapter titles can have personality; your body text should not.
• For the print PDF, embed your fonts so the book prints exactly as you designed it, regardless of the software on KDP's end.

Step 4: Build your front and back matter in order

A professional book includes its front matter in the expected order, and readers notice when it is missing or jumbled:

• Title page
• Copyright page
• Dedication (optional)
• Table of contents (essential for non-fiction; useful for fiction with named chapters)

Back matter comes after your story or final chapter — an about-the-author page, an invitation to leave a review, and links to your other books all belong here.

Step 5: Format the interior cleanly

This is where most amateur formatting gives itself away, and nearly all of it comes down to one rule: use styles and page breaks, never manual spacing.

• Set your paragraph indent with a paragraph style, not with tabs or spaces.
• Start each new chapter with a real page break, not a stack of empty paragraphs — empty paragraphs shift around and leave half-blank pages.
• In print, each chapter traditionally starts on a right-hand (recto) page, which sometimes means inserting a blank page.
• Handle scene breaks within a chapter with a blank line, a row of asterisks, or a small ornament — consistently throughout.

Before you export anything, strip every manual double space and tab from the whole document. Stray whitespace is the number-one cause of ugly Kindle pages and print problems.

Step 6: Format the ebook (EPUB)

For the ebook, remember you are formatting structure, not pixels, because the reader's device controls the actual appearance:

• Apply heading styles to your chapter titles so the device builds a working navigation.
• Use a single first-line indent set in the paragraph style.
• Insert genuine page breaks between chapters.
• Do not force a specific body font — readers choose their own; your job is to make headings, emphasis, and block quotes behave.

Export to EPUB, or upload a clean DOCX and let KDP convert it. You can also use Amazon's free Kindle Create app, which is well suited to text-heavy books with simple layouts and exports a KDP-ready file.

Step 7: Format the print PDF

For print, everything is fixed and unforgiving because nothing reflows:

• Set your document's page size to match your trim size exactly — not "close," exactly.
• Apply your mirrored margins and gutter from Step 2.
• Add running heads (author name, book title) and page numbers, suppressed on chapter-opening and front-matter pages where convention omits them.
• Export a print-ready PDF with fonts embedded.

Step 8: Preview before you upload

KDP's previewer shows you your book exactly as it will print or display. Page through the whole thing as a reader would, watching for text near the spine, broken page breaks, orphaned headings, and anything that looks off. Catching a problem here costs minutes; catching it in a one-star review costs a lot more.

The mistakes that get books rejected

The errors that trigger KDP rejection emails or amateur-looking results, all avoidable:

• Manual spaces and tabs instead of paragraph styles.
• A trim size that does not match your document's page size.
• Margins or a gutter too small for the page count, so text runs into the spine.
• Fonts not embedded in the print PDF, so it prints in a substitute typeface.
• Empty paragraphs used for spacing instead of real page breaks.

Fix these before uploading and you avoid the frustrating rejection-and-re-upload cycle entirely.

Tools, DIY, or hiring it out

You have three honest routes. Kindle Create or careful work in Word handles simple, text-heavy books for free if you follow the rules above. Dedicated formatting software gives you more control for complex layouts. And if the specifications feel like time taken away from your next book — or your book has images, tables, or an intricate design — professional formatting produces both clean files and gets the technical details right the first time. None is wrong; what matters is that the finished files are clean, because readers judge a book's professionalism in seconds.

The bottom line

Formatting a book for KDP comes down to respecting that ebook and print are two different files, choosing your trim size first, and using proper styles and page breaks instead of manual spacing. Get those foundations right, preview carefully, and you will have clean files that KDP accepts and readers enjoy — no rejection emails, no cramped margins, just a book that looks like it belongs on the shelf.