Kindle eBooks use reflowable text — content adjusts to the reader's font size preference and screen dimensions. This is fundamentally different from print formatting, where you control exactly where text appears on each fixed page.
Getting Kindle formatting right means your book looks professional on a Kindle Paperwhite, an iPad, an Android phone, and a desktop browser simultaneously. Getting it wrong means weird line breaks, inconsistent fonts, images that don't display, and 1-star reviews complaining about formatting.
This guide covers the complete Kindle formatting process.
Accepted File Formats for KDP Kindle
Amazon's Kindle Create tool converts your source file. Accepted inputs:
| Format | Compatibility | Best for |
|---|---|---|
| .docx (Microsoft Word) | Excellent | Text-based books |
| .epub | Excellent | Full control over final output |
| .html / .htm | Good | Technical users |
| .rtf | Fair | Basic text only |
| .txt | Basic | Plain text; loses all formatting |
| Poor | Not recommended for Kindle |
Recommendation: Use .docx for most text-based books. Use .epub for books with complex formatting needs.
Do NOT upload PDF for Kindle — PDFs are fixed-layout and display poorly on small screens (tiny text, horizontal scrolling required).
Formatting Your Word Document for Kindle
Basic Setup
Before writing or formatting:
- Font: Any standard font (Arial, Times New Roman, Garamond) — Kindle overrides fonts based on reader preference anyway
- Font size: 12pt standard — Kindle ignores this too, but it helps you write comfortably
- Page size: Any — doesn't matter for Kindle
- Margins: Any — doesn't matter for Kindle
What DOES matter for Kindle from Word:
Heading Styles
Use Word's built-in heading styles (Heading 1, Heading 2, Heading 3) for all chapter titles and section headers. Never manually bold or resize text for headers.
Why: Heading styles generate the book's table of contents automatically. Manual bold text does not.
How to apply: Select your chapter title → click "Heading 1" in the Styles panel. Section headers → "Heading 2."
Paragraph Formatting
For body text:
- No double spacing between paragraphs — use paragraph spacing instead
- Indented first line OR spacing between paragraphs — not both (industry convention; pick one)
- No tabs for indentation — use Word's paragraph indent settings
For Kindle, paragraph indent is most common for fiction. Space between paragraphs is most common for non-fiction.
Images
Kindle handles images in reflowable text, but with rules:
- Format: JPG or PNG
- Resolution: 72 DPI is sufficient for screen display (not 300 DPI like print)
- Size: Keep images under 1MB each; total book under 50MB
- Placement: Inline images (within text) work well; fixed-position images do not
Images in Kindle won't necessarily appear exactly where you placed them — they reflow with the text. Don't rely on precise image placement for meaning.
Tables
Simple tables work in Kindle. Complex tables with merged cells, heavy formatting, or precise column widths often render poorly. For complex data tables, consider converting to an image.
Hyperlinks
Internal links (to chapters, footnotes) work in Kindle. External URLs work in Kindle (clickable on supported devices). Remove internal document cross-references that won't work in eBook format.
Using Kindle Create
Amazon's free Kindle Create tool (download at kdp.amazon.com/en_US/help/topic/G202131700) converts your Word document and lets you preview exactly how it will look on Kindle devices.
Process
- Download and install Kindle Create
- Import your .docx file
- Select book type (Novel, Non-Fiction, or Comic/Manga)
- Kindle Create applies formatting automatically and shows you a preview
- Adjust: set front matter (title page, copyright, TOC), chapter breaks, and formatting
- Export as .kpf file (KDP's proprietary format) for upload
The Kindle Create Previewer
The most valuable feature: preview your book on a Kindle Paperwhite, Kindle Fire, and phone screen simultaneously. Check:
- Is the table of contents working?
- Do chapter titles appear correctly?
- Do images display properly?
- Is there any weird line wrapping?
Fix issues in Kindle Create before uploading.
Table of Contents
Every Kindle book should have a functional table of contents. Kindle readers use it to navigate non-linearly — especially for non-fiction.
Automatic TOC from Heading Styles
If you used Word's Heading styles correctly, Kindle Create generates the TOC automatically. Verify:
- All chapters appear in the TOC
- Clicking a chapter link in Kindle Create jumps to that chapter
Manual TOC (if needed)
For books with complex structure or if automatic generation fails:
- Create a "Table of Contents" page in your Word document
- List each chapter name as a hyperlink to the corresponding heading
- In Kindle Create, mark this page as the TOC
Front Matter and Back Matter
Required Front Matter
At minimum, every Kindle book should have:
- Title page: Book title, author name
- Copyright page: "Copyright © [year] [Author name]. All rights reserved."
Optional Front Matter
- Dedication
- Preface or introduction (for non-fiction)
- Table of Contents (should be before chapter 1)
Back Matter
- About the Author
- Also by [Author Name] — list your other books
- Review request: "If you found this book helpful, please leave a brief review on Amazon"
"Also by" Page
This is one of the highest-ROI elements in an eBook. A buyer who just finished your book sees your other titles and clicks to Amazon to browse them. This drives cross-catalog sales with no marketing cost.
EPUB Formatting (Advanced)
For publishers who want full control over Kindle formatting:
- Write in Word or any editor
- Convert to EPUB using Calibre (free) or Vellum ($199.99 Mac only — professional results)
- Edit the EPUB's CSS for precise styling
- Upload EPUB directly to KDP
Vellum produces the most beautiful Kindle eBook formatting available and is the standard tool for professional fiction publishers. For non-fiction and low content, Kindle Create from Word is sufficient.
Common Kindle Formatting Errors
| Error | Cause | Fix |
|---|---|---|
| No table of contents | Didn't use Heading styles | Apply Heading 1/2/3 to all headers |
| Weird font sizes | Mixed manual font sizes | Remove all manual font formatting; use styles only |
| Images missing | Images linked externally not embedded | Embed images in Word file |
| Blank pages between chapters | Manual page breaks used incorrectly | Use Word's "Insert Page Break" only before chapter titles |
| Text running together | No paragraph spacing | Add 6–8pt space after paragraphs |
| Headers appearing in wrong size | Heading style overridden manually | Reset heading styles |
KDP's Kindle Preview Tool
After uploading your file to KDP, before publishing:
- On the Kindle eBook Content page, click "Preview Book"
- This opens KDP's online previewer
- Test on different device views: Kindle, Fire tablet, Phone
- Verify TOC, images, chapter breaks
Don't skip the preview step. Issues visible in preview are invisible when you're writing but obvious to buyers on their devices.
Pricing and File Size
KDP's delivery fee for the 70% royalty tier is $0.15/MB. For a text-only book (typical size: 0.1–0.5MB), this is negligible ($0.015–$0.075).
For image-heavy books or books with many embedded graphics, file size can reach 5–10MB — adding $0.75–$1.50 to your delivery cost. Factor this into your pricing.
To reduce file size:
- Compress images before inserting (tools: TinyPNG, Squoosh)
- Use JPG instead of PNG for photographs
- Remove unused embedded fonts
Frequently Asked Questions
Can I use the same file for Kindle and paperback?
No. Paperback requires a fixed-layout PDF. Kindle requires a reflowable format (Word, EPUB, or KPF). They're fundamentally different file types.
How do I add a clickable link to my other books in the "Also by" section?
In Word, insert a hyperlink to your Amazon book listing URL. In Kindle Create, verify the link is active. Kindle readers can tap these links to go directly to your Amazon listing.
Does my Kindle book need page numbers?
No. Kindle books use "location numbers" not page numbers, because pages change size based on reader settings. Don't add page numbers to your Kindle formatting.
How long does KDP take to review a Kindle eBook?
24–72 hours for new submissions. Updates to existing books take 12–24 hours.
What's the maximum file size for a Kindle eBook on KDP?
650MB. Practically, you'll never approach this with text-based books. Image-heavy books (comics, illustrated guides) can get large — compress images and test file size in Kindle Create before uploading.
Summary
Kindle formatting succeeds when you work with Kindle's reflowable design rather than against it:
- Use Word Heading styles for all chapter titles and headers
- Don't use tabs, manual indents, or manual font sizing
- Use Kindle Create to preview on all device types before upload
- Include front matter (title page, copyright) and back matter (author page, "also by")
- Test the TOC navigation
The goal isn't to make the Kindle book look like the print version — it's to make it look clean, professional, and readable on every screen size.