eBook Formatting: Getting Your Novel Ready for Every Screen
A poorly formatted ebook bleeds reviews. Here's how to format yours so readers never notice the container, only the story.
The Six Pillars of eBook Formatting
The basics of ebook formatting (reflowable vs fixed layout)
Ebooks come in two fundamental formats: reflowable and fixed layout. Reflowable is what most novels use — the text reflows to fit the reader's screen, font size, and device. Fixed layout locks every element in place, like a picture book or heavily designed non-fiction. For fiction, always choose reflowable. For illustrated children's books or cookbooks where layout matters, fixed layout makes sense.
The core file formats are EPUB (the open standard used by Kobo, Apple Books, Barnes & Noble, and most retailers) and MOBI/KFX (Amazon's proprietary formats). KDP converts your uploaded file automatically, but understanding what you're uploading — and why — prevents errors. An EPUB3 file is the most compatible starting point for any wide-distribution strategy.
Microsoft Word: cleaning it before you export
Most authors write in Word, and Word is a perfectly valid starting point — if you clean it first. The biggest problem is invisible formatting: manual line breaks, double spaces, tab-based indents, and local font overrides that don't translate cleanly to ebook format.
Before exporting, run a find-and-replace to remove double spaces. Turn on paragraph marks to find stray line breaks. Use paragraph styles (not manual formatting) for everything — body text, chapter headings, scene breaks. Remove any manual page breaks except at chapter starts. Strip out headers and footers entirely; ebook readers don't use them. Set first-line indents via paragraph style, not the Tab key. A clean Word file produces a clean ebook; a messy one produces the formatting errors readers mention in reviews.
Vellum (Mac) and Atticus (cross-platform) — the author's formatting tools
Vellum (Mac only) and Atticus (Windows, Mac, browser) are purpose-built book formatting tools. Both import your manuscript and produce clean, professional EPUB and PDF files with a fraction of the manual effort. They handle things like drop caps, scene-break ornaments, front matter ordering, and chapter styling through visual interfaces rather than code.
Vellum is the gold standard for Mac users — the output is beautiful and the interface is intuitive. It costs around $250 for unlimited books. Atticus is the cross-platform alternative at roughly $147, with active development adding features. Both are faster and more reliable than manually wrestling Word into shape. If you're publishing more than two or three books, either tool pays for itself in time saved and produces a noticeably more polished result.
Creating a clickable Table of Contents
A clickable TOC is not optional — it's required by KDP and expected by readers on every device. There are two types: the logical TOC (embedded in the EPUB file's navigation document, invisible to readers but used by reading apps) and the HTML TOC (a visible page in your book that readers can navigate from).
In Word, you generate a TOC from heading styles, then it's exported and linked automatically. In Vellum or Atticus, the TOC is built for you. If you're manually building EPUB files, each chapter needs an anchor ID and the TOC file must link to those anchors. KDP will flag your file if the NCX/navigation document is missing or broken. Test your TOC on an actual Kindle device or the Kindle Previewer app — not just on your computer — before publishing.
Front and back matter (copyright, author bio, newsletter link)
Front matter is everything before chapter one: title page, copyright page, dedication, and (optionally) a table of contents. Keep front matter minimal in ebooks — readers on Amazon see a "Look Inside" preview, and you want them to hit story as fast as possible. A title page, copyright page, and TOC is enough.
Back matter is where you work. Include: an "Also by" page, an author bio, a review request (politely worded), and — critically — a newsletter signup link. That link is the most valuable real estate in your book. Readers who finish your book are warm leads. A simple "Join my reader list for new releases and free stories" with a direct link converts well. Add a "What to read next" page for your next book or series, with a direct Amazon link. Back matter done right turns one sale into a reader relationship.
Previewing your ebook before you publish
Never publish an ebook you haven't previewed on an actual device. Amazon's Kindle Previewer (free, desktop app) simulates how your book looks on different Kindle models, tablets, and phones. It catches formatting issues the upload process won't flag: broken TOC links, font fallbacks, image sizing problems, and chapter heading inconsistencies.
Also test on a physical Kindle if you have one, and in the Kindle app on your phone. What looks fine on a desktop preview can look broken on a 6-inch e-ink screen. For wide distribution, download your EPUB and open it in Apple Books or Calibre. Check the first page, a chapter break, any scene breaks, and your back matter links. This 15-minute check prevents the one-star reviews that mention formatting.
Frequently Asked Questions
Do I need special software to format my ebook, or can I use Word?
Word works, but only if you clean it meticulously — stripping manual formatting, using paragraph styles for everything, and exporting carefully. Most authors who publish more than a couple of books switch to Vellum (Mac) or Atticus (cross-platform) because both produce cleaner output with far less effort. They cost money upfront but save hours per book. If budget is a constraint, a thoroughly cleaned Word file exported to EPUB via Calibre is a viable free option — just test the output rigorously before uploading.
What's the difference between EPUB and MOBI — which should I upload to KDP?
MOBI is Amazon's older format; KFX is their current one. You don't create either directly — KDP converts from your upload. Amazon currently recommends uploading an EPUB file rather than MOBI or DOCX, because EPUB gives them the most to work with for conversion to KFX. For every other retailer (Kobo, Apple Books, Google Play, Barnes & Noble), EPUB is the native format. Submit EPUB everywhere. Don't submit MOBI — it's a legacy format that will eventually be deprecated.
What are the most common ebook formatting errors that hurt reader experience?
The most common errors are: inconsistent paragraph spacing (some indented, some not), visible tab characters used as indents instead of paragraph styles, missing or broken TOC links, images that are too large and load slowly or display oddly, scene break characters that don't render on all devices, and front matter that pushes the story start too far back. The last one is sneaky — if your book starts on page 12 rather than page 1, readers who use the 'Look Inside' feature may never reach actual story. Keep front matter to three pages maximum.
Does ebook formatting actually affect reviews?
Yes — consistently and measurably. Formatting errors generate reviews even from readers who loved the story. Phrases like 'great story but the formatting was distracting' or 'clearly self-published' appear in one- and two-star reviews regularly. Readers don't consciously notice good formatting; they only notice bad formatting. A clean, invisible reading experience is the goal. It won't generate five-star reviews on its own, but poor formatting will generate one-star reviews that drag your overall rating down and discourage future buyers.
Is Vellum worth it if I only publish one or two books?
At $250 for unlimited books, Vellum's value scales with volume. For one book, the per-book cost is high. If you're confident you'll publish at least five books over your career, it pays for itself. If you're less sure, Atticus at $147 is a lower-risk entry point. For a single book, a well-cleaned Word file exported carefully — and tested thoroughly — produces acceptable results. The professional polish Vellum adds is real, but it's a marginal difference compared to fixing the underlying formatting errors that actually harm reader experience.