Well, you’ve written your book; the book is ready and you’re staring at your computer screen thinking what do I do next? It’s formatting. One word that has most authors shutting down their laptops and walking away.
Here’s the truth you do not need to pay someone hundreds of dollars to get your book looking professional on Amazon KDP. Plenty of authors figure this out on their own, including those trying to self publish a children’s book on Amazon or release a nonfiction guide, a romance novel, or a poetry collection. The learning curve is real, but it’s not as steep as the formatting gurus on YouTube want you to believe.
This guide walks you through the actual problems writers run into and how to fix them, step by step.
The Problem With Most Formatting Guides
Almost all of the guides begin by supposing that you have an empty Word document. In reality, you usually have a manuscript that has all kinds of formatting errors, including inconsistent spacing, fonts that were switched several times throughout the writing process, misplaced page breaks, and weirdly acting headers.
However, before you adjust anything in your margins, you must prepare the document. Open your Word file, press Ctrl+A to select everything, and clear formatting. Your document will become completely plain and ugly. That’s precisely what you need at this point. Create your formatting from scratch instead of fixing the inherited styles.
Choosing Your Trim Size First
This is the decision most first-timers skip, and they regret it. Your trim size the physical dimensions of your printed book changes everything about how your pages are set up.
The most common trim sizes for KDP print books are:
- 6 x 9 inches standard for nonfiction, self-help, memoirs
- 5.5 x 8.5 inches popular for fiction paperbacks
- 8.5 x 8.5 inches or 8.5 x 11 inches common for those looking to self publish a children’s book on Amazon, since picture books need wider pages and room for illustrations
Set your document page size to match your trim size before you write a single style rule. Go to Layout > Size > More Paper Sizes and enter the dimensions manually. Getting this wrong and fixing it later causes everything to reflow, and you’ll redo hours of work.
Margins Matter More Than You Think
Amazon KDP has specific margin requirements based on page count. Get these wrong and your book gets rejected, or worse approved but printed with text running off the page.
Here are the minimum inside (gutter) margins by page count:
- 24–150 pages: 0.375 inch gutter
- 151–300 pages: 0.75 inch gutter
- 301–500 pages: 0.875 inch gutter
- 500+ pages: 1 inch gutter
Outside, top, and bottom margins must be set at least 0.25 inches, but a better choice would be between 0.5 and 0.75 inches as it makes the book look more professional and provides breathing space.
To set the gutter in Word, go to Layout > Margins > Custom Margins and set “Multiple Pages” to “Mirror Margins.” The reason is that the inside margin must alternate with each page.
Paragraph and Font Formatting
Pick one body font and stick with it. Garamond, Times New Roman, and Book Antiqua are all clean, readable choices. Avoid anything that looks like a system default or a web font they rarely translate well to print.
Body text size should sit between 10 and 12 points for standard adult books. Children’s books go larger, often 14 to 18 points depending on age range.
Line spacing should be set to exactly 14 or 15 points for a 12-point font not “double spacing” and not “1.5.” Use Format > Paragraph > Line Spacing > Exactly. This gives your text the tight, professional spacing you see in traditionally published books, not the airy draft-mode look.
With regard to paragraph indentation, avoid using the Tab key at all costs. Make a first line indentation of 0.3 inch through the paragraph options. The start of each chapter does not require a first-line indentation since this is the way most books begin chapters.
Headers, Footers, and Page Numbers
It is at this point where most people get confused. You will need to use different headers/footers in each section. The title page and the copyright page will have no page numbers, the front matter (table of contents and dedication, if any) may use Roman Numerals, and the body uses Arabic Numerals starting with page one.
In Word, in order to do so, you need to use Section Breaks (and not page breaks). Go to Layout > Breaks > Next Page. Then for each section, double-click the footer section, and select ‘Unlink from Previous’ in order to be able to assign each section different page numbers.
The chapter titles usually go in the headers of odd pages (right), while the author name should be in even pages (left). This is the practice in most printed books. In order to do so, go to Insert > Header, and select ‘Different Odd and Even Pages.’
Handling Images in Your Book
If you’re formatting a book with photos, charts, or illustrations especially if you’re trying to self publish a children’s book on Amazon, images need to be at least 300 DPI at the size they’ll appear in the final print. A small image stretched to fill a page looks pixelated and unprofessional.
For children’s picture books specifically, KDP works best with a PDF where images are embedded, full-bleed (if they go to the edge of the page), and color-accurate. KDP accepts both CMYK and RGB images, but their print process will convert to CMYK, so preview your colors accordingly. Bright digital colors sometimes shift slightly in print.
Place your images inline with text in Word, not floating. Floating images shift unpredictably when converted to PDF. Set each image to “In Line with Text” under the image formatting options.
Converting to PDF Correctly
Never use “Save As PDF” from the standard Word dialog. Instead, go to File > Export > Create PDF/XPS, and in the options, check “ISO 19005-1 compliant (PDF/A)” and make sure fonts are embedded. This creates a properly structured, press-ready PDF that KDP’s system reads cleanly.
Before uploading, open the PDF and look at every single page. Check the margins, the page numbers, the chapter openings, and any images. KDP’s online previewer will show you a version after upload, but catching problems before that step saves you multiple upload cycles.
eBook Formatting Is a Separate Animal
Kindle ebooks and print books are formatted completely differently. For ebooks, you strip out fixed margins, page numbers, headers, and footers entirely. Ebooks reflow based on the reader’s device and font size preferences.
The simplest path for ebook formatting is to use Calibre (free software) or Draft2Digital to convert a clean Word document. Alternatively, Kindle Create Amazon’s own free tool handles basic ebook conversion with a clean visual interface.
If you’ve worked with an ebook marketing company in the USA before, they may have provided you with a formatted file as part of their package. If so, make sure that file is in EPUB or MOBI format before uploading to KDP. Amazon now prefers EPUB over MOBI for newer uploads.
Cover Sizing and the KDP Cover Creator
The interior file and your cover are uploaded on KDP as separate entities. The dimensions of the cover will depend on the size of your trim and total number of pages. KDP gives you a Cover Calculator for free which gives you exact dimensions based on your trim size, number of pages, and paper color (white or cream).
Canva gives you ready templates for covers on KDP which size automatically and are print ready; just ensure to save in 300 DPI PDF.
Common Errors That Get Books Rejected
These are the ones that bite people most often:
- Bleed images that don’t extend to the bleed line if an image is supposed to go edge to edge, it needs to extend 0.125 inches past the trim line
- Low-resolution images anything under 300 DPI will fail the quality check
- Incorrect spine width the spine is calculated from page count; a cover designed for 200 pages won’t fit a 220-page book
- Missing or improper barcode area KDP places the ISBN barcode on the back cover; leave a 2 x 1.2 inch white rectangle in the lower right area
The Bottom Line
Formatting your own KDP book is genuinely doable, and the money you save can go toward actual marketing. If you’re planning to self publish a children’s book on Amazon, budget extra time for illustration placement and color proofing. It’s more involved than a text-only book but still very manageable without outside help.
Many authors also team up with an ebook marketing company in the USA after the formatting is done, letting professionals handle the visibility side while the author controls the production costs. That’s a smart split own your file, and outsource the promotion.
The first book you format will take longer than you expect. The second one will take half the time. By the third, it becomes routine. Start with a clean document, respect the margin rules, test your PDF before uploading, and you’ll get through it.
Your readers won’t know what software you used or how many hours the formatting took. They’ll just see a clean, readable book and that’s the whole point.