The moment it stops being about writing
You've written a book. Tens of thousands of words born from ill-advised late-night sessions fuelled by biscuits and self-doubt. You've edited it. You've had other people read it. You've stared at the manuscript so many times the words have lost all meaning, like repeating your own name until it sounds foreign.
And now you need to turn it into something a Kindle can actually display. Which is roughly the point where most first-time indie authors discover that formatting is a thing, and that it's a thing they know absolutely nothing about.
The good news is that ebook formatting is considerably less terrifying than it looks. The bad news is that it's just fiddly enough to ruin your afternoon if you go in blind. So let's walk through it — what Amazon expects, what tools exist, and where people reliably come unstuck.
What KDP actually accepts
Amazon's Kindle Direct Publishing platform accepts several file types for ebook manuscripts: EPUB, Word documents (.doc and .docx), HTML, plain text, and RTF. In theory, you could upload any of these and Amazon will convert it into its internal format for delivery to Kindle devices and apps.
In practice, you want to upload an EPUB file. Specifically, EPUB 3 if your formatting tool supports it. The reason is simple: EPUB-to-KFX conversion (KFX being Amazon's internal format) is the most reliable path. It produces the most consistent results across different Kindle devices, from the basic Kindle to the Paperwhite to the Kindle app on someone's iPad.
Word documents work, technically, in the same way that a car with three wheels technically still moves. Amazon's Word-to-KFX conversion is less predictable. Formatting that looks perfect in Microsoft Word can come out the other side looking like it was assembled by someone who'd never seen a book before. Indentation goes rogue. Spacing collapses. Chapter breaks appear where they shouldn't, or don't appear where they should.
If you wrote your book in Word — and most people do — the smartest move is to export or convert it to EPUB before uploading to KDP. Which brings us to the tools.
The tools worth knowing about
There are essentially three tiers of ebook formatting tools, and which one you need depends on your budget, your operating system, and how much you enjoy swearing at your computer.
Tier one: the professionals
Vellum is the gold standard for ebook formatting, and has been for years. It produces beautiful, clean files with minimal effort. You import your manuscript, choose a style, tweak a few settings, and export a perfectly formatted EPUB (and print-ready PDF, if you want one). The catch? It's Mac-only, and it costs $249.99 for the full package. If you're on Windows, Vellum simply isn't an option unless you want to get into the murky world of running macOS in a virtual machine, which I wouldn't recommend to anyone who values their sanity.
Atticus is the main alternative, and it's a good one. It runs on any platform — Mac, Windows, Linux, even in a browser — and costs a one-off $147 for a lifetime licence with unlimited books. It's not quite as polished as Vellum in terms of output, but it's close, and the gap has been narrowing steadily. It also doubles as a writing tool, which Vellum doesn't, so if you want to write and format in the same application, Atticus is worth a serious look.
Both tools handle the technical side for you. No need to understand EPUB structure, CSS, or HTML. Import your text, make it look the way you want, hit export. For most indie authors, this is the right approach.
Tier two: the free options
Kindle Create is Amazon's own free formatting tool. It handles straightforward fiction well enough — novels with chapters and not much else. Limited style options, limited control over layout, and it buckles under anything complex. But it's free and it produces files KDP handles reliably. Can't argue with free.
Calibre is an open-source tool that includes format conversion. It's powerful but unfriendly — the interface looks like it was designed in 2006, because it was. If the phrase "CSS override" makes you anxious, look elsewhere.
Tier three: doing it yourself in Word
You can format your ebook entirely in Word and upload the .docx directly to KDP. But it requires discipline. You need to use Word's built-in styles — Heading 1 for chapter titles, Normal for body text — rather than manually formatting things to look right on screen. KDP's converter reads the underlying style information, not the visual appearance.
The single most important thing: stop pressing Enter twice between paragraphs and start using paragraph spacing in your style settings instead. I realise that sentence meant nothing to some of you. That's fine. It's exactly why tools like Vellum and Atticus exist.
The mistakes that will ruin your day
Having established what to use, let's talk about what goes wrong. These are the formatting mistakes that trip up indie authors with depressing regularity, and most of them are entirely avoidable.
No table of contents
Amazon requires a functional, clickable table of contents in your ebook. Not a page that lists chapter names — an actual navigable TOC built into the file structure. If you're using Vellum or Atticus, this is generated automatically. If you're formatting in Word, you need to build it using Word's built-in TOC generator, which pulls from your heading styles. If your heading styles are a mess, your TOC will be a mess. Or nonexistent.
Manual formatting instead of styles
This is the big one. If you've been selecting text and manually changing the font size, hitting the bold button, and pressing Tab to indent your paragraphs, your manuscript is a formatting time bomb. It might look fine on your screen, but the underlying code is chaos. When KDP converts it, all that manual formatting gets interpreted inconsistently, and you end up with paragraphs that have different indentation depths, random font size changes, and spacing that looks like it was decided by rolling dice.
The fix is styles. Always styles. It's boring advice, but it's the single thing that prevents ninety percent of formatting disasters.
Forgetting to check the preview
KDP has a previewer. It shows you exactly what your ebook will look like on various Kindle devices. A remarkable number of authors skip this step, presumably because they've already spent months staring at their manuscript and can't bear to look at it again. Don't be one of them. The previewer exists because conversion is unpredictable, and the five minutes you spend checking it could save you from publishing a book where chapter three starts halfway through chapter two.
Tracked changes and hidden gremlins
If you edited your manuscript in Word with tracked changes or comments, make sure you accept all changes and delete all comments before exporting. Hidden tracked changes, unused styles, and embedded comments can all interfere with conversion in subtle and infuriating ways. Review tab, Accept All Changes, Delete All Comments. Ten seconds. Prevents an entire category of problems.
The actual process, simplified
If you want to get your ebook formatted and uploaded without drama, here's the straightforward version:
- Write your book in whatever tool you prefer. Word is fine. Google Docs is fine. Scrivener is fine.
- Export or save as a .docx file with proper heading styles applied to chapter titles.
- Import into Vellum (Mac) or Atticus (any platform). Choose a style. Adjust chapter headings and spacing to taste.
- Export as EPUB.
- Upload the EPUB to KDP.
- Use the KDP previewer to check every chapter on at least two device views.
- Fix anything that looks wrong. Re-export. Re-upload. Re-check.
That's it. Step seven sometimes repeats a few times, but the whole process for a standard novel should take an hour or two — assuming your manuscript is clean and your heading styles are in order.
Is it worth paying for a formatting tool?
If you're publishing one book and never plan to publish another, Kindle Create or a carefully formatted Word document will do. But if you're planning to publish more than one — and most indie authors eventually do — Vellum or Atticus pays for itself almost immediately in time and frustration saved.
Either way, the point is this: formatting is not the creative part of publishing. It's plumbing. You want it to work, you want it to be invisible, and you want to spend as little time thinking about it as possible so you can get back to the bit that actually matters — writing the next book.
If you're in the early stages of getting your first book ready for publication and want to make sure formatting is just one of many boxes you've ticked rather than the thing that derails your entire launch, WIPsage helps you keep track of every step in the process — so nothing gets forgotten while you're busy wrestling with EPUB files.