If you are a self-published author working on novels, novellas, and short story collections and your manuscript is currently in DOCX format, this guide will walk you through everything you need to know about converting it to a professional Kindle EPUB at the 6" x 9" (152 x 229 mm) trim size.
Why 6" x 9" for Fiction?
The 6" x 9" trim size is the industry standard for novels, novellas, and short story collections. It provides a comfortable reading experience while keeping printing costs manageable. At this size, the page count depends on your font, size, leading and margins.
Converting DOCX to Kindle EPUB
Your DOCX file from Microsoft Word documents needs to be converted to a format that Amazon Kindle eBook EPUB can accept.
Key Requirements for Kindle EPUB
Kindle requires a reflowable EPUB file with a properly coded navigation document (EPUB 3), a hyperlinked HTML Table of Contents, and optimised images at 300 DPI.
Margin Requirements at 6" x 9"
If you also make a 6" x 9" print edition, the minimum print margins are (a Kindle EPUB reflows and has no fixed trim or margins):
| Margin | Minimum | Recommended |
|---|---|---|
| Top | 0.25" (6.4 mm) | 0.5" (12.7 mm) |
| Bottom | 0.25" (6.4 mm) | 0.5" (12.7 mm) |
| Outside | 0.25" (6.4 mm) | 0.5" (12.7 mm) |
| Gutter (inside) | Varies by page count | See KDP gutter table |
Common Formatting Challenges for Fiction
Fiction typically requires clean chapter headings, consistent paragraph indentation (a 0.3 inch first-line indent is common), and proper handling of scene breaks. Avoid using multiple blank lines for scene breaks; use a centred ornamental break (three asterisks or a decorative glyph) instead.
The Automated Alternative
Manually converting a DOCX file to a Kindle EPUB-ready format at 6" x 9" can take hours of trial and error. At publishing.co.uk, our automated formatting engine handles the entire process within 24 hours.
Simply upload your DOCX file, select 6x9 as your trim size, and receive a professionally formatted Kindle EPUB file built to pass KDP’s automated review.
From £69. Unlimited revisions. Built to KDP spec.