Preparing an eBook for publishing involves much more than converting a manuscript into an EPUB file. A good eBook needs clean structure, responsive formatting, accurate metadata, accessible content, optimized images, working navigation, and testing across different reading environments. Getting these elements right before publication can prevent rejected uploads, broken layouts, and frustrating reading experiences later.
The tools have changed significantly since the early days of eBooks, but the principle has not: careful preparation saves time. Here are the most important things authors and publishers should check before releasing an eBook today.
1. Start With the Right eBook Format
For most text-heavy books, EPUB remains the most practical publishing format.
EPUB 3.3 became an official W3C Recommendation in January 2026 and supports reflowable text, multimedia, accessibility features, global typography, and more complex publishing needs. EPUB 3.4 is also progressing through the standards process, but EPUB 3.3 remains an established baseline for current publishing workflows.
Amazon also accepts EPUB files for Kindle publishing and recommends EPUB, DOCX, or its Kindle Package Format for reflowable books. Older MOBI-based workflows should no longer be treated as the default.
2. Do Not Reproduce the Print Layout Exactly
Having the print edition available as a reference can still be helpful, but an eBook should not simply imitate a printed page.
A standard reflowable EPUB adapts to different screen sizes, orientations, fonts, and reader settings. Avoid forcing fixed font sizes, page dimensions, line breaks, or margins unless the content genuinely requires a fixed layout.
Instead, preserve the book's hierarchy and character while allowing readers to control how the text appears on their device.
3. Clean the Manuscript Before Styling It
Formatting problems often begin in the source document.
Before building your EPUB, look for unnecessary spaces, repeated line breaks, manual tabs, inconsistent quotation marks, hidden formatting, unsupported characters, and copied text carrying unwanted styles.
This is particularly important for multilingual publications. Make sure the text uses proper Unicode characters rather than visual substitutes or unusual legacy encodings.
A clean source file makes the rest of the conversion process significantly easier.
4. Use Styles and Semantic Structure Consistently
Styles remain one of the most important parts of eBook production.
Instead of manually adjusting every heading or paragraph, create consistent styles for body text, headings, block quotes, captions, lists, and other recurring elements.
More importantly, use real structural elements. A chapter title should be marked as a heading rather than merely made larger and bold. Lists should behave as lists, and quotations should be identified appropriately.
Good semantic structure improves navigation, accessibility, conversion quality, and compatibility with reading systems.
5. Make Accessibility Part of the Build
Accessibility is no longer something publishers should address only after the eBook is finished.
EPUB's current standards build accessibility directly into digital publishing. Authors should use logical heading structures, meaningful link text, appropriate document language, accessible navigation, and alternative text for informative images.
Decorative images should be identified appropriately so assistive technologies do not waste the reader's time describing them.
Accessible formatting benefits more than readers using screen readers. Good structure generally creates a cleaner, more predictable reading experience for everyone.
6. Optimize Images for Small Screens
Images that look excellent on a large desktop monitor may behave very differently on a phone or e-reader.
Check illustrations, charts, photographs, maps, and diagrams at multiple screen sizes. Images should scale responsively without forcing horizontal scrolling or becoming too small to understand.
Also avoid putting essential information only inside an image. If a chart or illustration communicates something necessary to the book, provide useful alternative text or supporting text in the surrounding content.
File size matters too. Excessively large images can increase download size without noticeably improving the reading experience.
7. Check Your Navigation and Metadata
Your EPUB should contain a functioning table of contents and logical reading order.
Test every chapter link before publishing. Readers should be able to navigate through the book without encountering missing sections, incorrect destinations, or duplicated chapters.
Metadata also deserves careful attention. Confirm the title, author or creator name, language, identifier, publisher information where applicable, and other descriptive information before distribution.
Do not treat metadata as administrative busywork. It helps retailers, libraries, reading systems, and readers correctly identify your publication.
8. Validate the EPUB Before Uploading It
A book can look fine and still contain technical errors.
Run the finished file through EPUBCheck, the official EPUB conformance checker maintained by the DAISY Consortium for W3C. In September 2026, EPUBCheck 5.4.0 became the latest production-ready release.
Validation can catch problems involving markup, missing resources, metadata, navigation, file structure, and other issues that may otherwise appear only after you submit the book.
Fix errors before distribution rather than assuming a retailer will correct them automatically.
9. Preview the Book in More Than One Reading Environment
The old advice was to keep a physical e-reader beside your computer. Testing is still essential, but relying on a single device is no longer enough.
Preview your eBook at different font sizes, screen widths, and orientations. For Kindle editions, Amazon recommends Kindle Previewer to examine how books display across Kindle environments and specifically notes that sideloading alone does not accurately reproduce all Enhanced Typesetting features.
Pay particular attention to headings, lists, images, tables, links, page breaks, special characters, and the first and last pages of every chapter.
Finally, decide how the finished eBook will be distributed and protected. DRM settings can affect how readers download, transfer, and access files. Amazon, for example, changed its DRM-free policy in January 2026 so verified purchasers can download EPUB or PDF copies of eligible DRM-free Kindle books.
If you distribute eBooks directly, services such as EditionGuard can help manage secure delivery and DRM while allowing publishers to choose how readers access their content.
A Better eBook Starts Before Publication
Most eBook problems are easier to fix before the file reaches readers.
Clean your source manuscript, use responsive and semantic formatting, build accessibility into the book, optimize images, verify metadata and navigation, validate the EPUB, and test it in realistic reading environments.
A little extra quality control before publication can prevent a great deal of troubleshooting after launch—and give readers the polished experience your book deserves.
