Converted PDF Looks Wrong on Your E-reader? How to Diagnose and Fix the EPUB

When a converted book looks wrong, the instinct is to try another tool. Usually the better move is to work out what kind of problem you have. A PDF is a fixed page description, and an EPUB is reflowable content with structure. Moving from one to the other means the converter infers paragraphs, headings and reading order from where text sits on each page.

calibre’s conversion manual makes the same point: results depend on the source format, and calibre is not an EPUB editor, so polishing is a separate step. Treat the first conversion as a draft and use the table above to name each problem before changing anything.

First, open the original PDF and try to select a sentence. If you cannot, it may be an image-only scan or have selection restrictions; check in another reader. An image-only scan needs OCR before conversion. Then examine a page with a table, footnote or header, and note whether the PDF uses columns.

Writing down three or four concrete observations, such as “footnotes land mid-paragraph” or “chapter 3 is missing”, turns a vague feeling that the file is bad into something you can check after each attempt.

Run the file through BookFormat’s PDF to EPUB converter. Because the conversion happens in your browser, the document is not uploaded, which matters for contracts, research drafts or anything personal.

Open the result in a reading app and compare it with the PDF on the same pages you noted earlier. Compare structure, not looks: are paragraphs whole, are chapters separate, does the text stay in order? Fonts and margins are controlled by your reader and are not a defect.

A readable EPUB needs navigation. The EPUB specification defines a navigation document that readers use for the table of contents, so a book without one is hard to move around in even if the text is fine. Confirm that each chapter appears in the contents and opens at the right place.

Then check the title, author and language, which libraries and readers use to sort and display books. Finally, add a cover if it is missing. Our guide on adding a cover image to an EPUB covers that step.

For repeated headers and footers, the cleanest fix is upstream: export the source without them, or remove them from the converted text. For columns, check the reading order on one page, since a wrong order usually repeats across the whole book.

For footnotes, accept them at the end of a chapter rather than trying to recreate page-bottom notes, which do not exist in reflowable text. Tables with simple rows can often be rebuilt as real tables, while complex ones are better left in the PDF. Forced page breaks from the PDF should not appear as blank gaps in the EPUB; if they do, remove them in an editor.

Keep the PDF when exact pages matter: textbooks with diagrams, sheet music, forms, comics, and documents you cite by page number. Converting these loses the thing that made them useful. A larger screen, zoom and cropping tools are often better than reflow.

Reflow pays off for text-first material such as novels, essays and articles. If the result is close but not perfect, you can keep both files and use each where it works best. Standard Ebooks and calibre both treat EPUB as the format for text that adapts to the reader.

Apps and devices render EPUB slightly differently, so finish by testing where you will read. On Kindle, EPUB goes through Send to Kindle, which converts it, so check the converted result and not only the original file.

Change the font size, look at the first chapter and a page with a table, and use the search function. If a page that looked fine on your computer breaks there, note it before you decide to fix or revert.