Simple text-led ebooks can often be formatted with publishing tools, but professional help becomes more valuable when a book has complex styling, images, tables, footnotes, linked contents or multiple output requirements. The file should be tested for navigation and device behaviour before publication.
Reflowable is not print layout
Most Kindle ebooks reflow to the reader’s device and font settings, so a print PDF is not an ebook file.
Complex books need more testing
Illustrated nonfiction, recipes, textbooks and reference works can need additional work to preserve hierarchy and usability across devices.
Ask for the final deliverables
Confirm which ebook file formats are supplied, whether retailer validation is included and how post-delivery text corrections are handled.