Having a book converted from PDF to EPUB may initially sound like a simple file step. For professional publication, however, it is a matter of book production: a PDF maps pages, while an EPUB maps content in a structured way. It is precisely this structure that ensures chapters, paragraphs, images and indexes function correctly on an e-reader even when the font size is changed.
Anyone wishing to publish a book as an e-book should therefore not consider the conversion only at the end. The quality of the EPUB file plays a decisive role in whether readers can read with concentration – or whether they give up due to misaligned headings, inappropriate line breaks and missing navigation elements.
Why PDF and EPUB work differently
A PDF is a fixed-layout output format. Each page is designed for a specific format, such as paperback, hardcover or DIN A4. Fonts, page numbers, line breaks and image positions remain exactly where they were intended in the typesetting. This is ideal for print and for documents whose design should remain unchanged.
An EPUB works differently. It is what is known as a reflowable format: the text adapts to the display size, font size, device and personal reading settings. A heading that appears at the bottom of a view on a small smartphone may appear considerably higher up on a large e-reader. Page numbers in the traditional sense are therefore not reliable. What matters is semantically marked-up content rather than fixed page areas.
This is precisely where the difficulty lies. An automatic conversion can extract text from a PDF, but does not always correctly identify what constitutes a chapter heading, a quotation, a caption or a simple manual line break. The risk is lower for a cleanly laid-out novel than for a non-fiction book with tables, footnotes and complex layouts. Nevertheless, a pure file export is no guarantee of a publication-ready e-book.
Converting PDF to EPUB: Choosing the best source file
The best conversion almost never starts with the PDF. If the manuscript is still available as an editable file, that file should serve as the basis. Heading hierarchies, paragraphs, lists and image placements are usually far more clearly identifiable there. A reliable EPUB can be generated more dependably from a well-structured source file than from an already typeset print PDF.
The PDF is a more sensible starting point when no original file is available any longer, or when the book has a simple structure. Before conversion, it should be checked whether the text in the PDF is actually selectable. If each page is merely an image, the file will first require text recognition. Errors may arise in this process, for example with ligatures, special characters, hyphenation or numbers. These errors must be carefully reviewed before publication.
Manual word hyphenation deserves particular attention. In print, it is standard practice; in an EPUB, hyphens can remain visible in the middle of the reading flow. „Veröffentli- chung“ then becomes a visible quality defect. Blank lines, tabs and multiple spaces are also not reliable design tools in an EPUB. They must be replaced by a clean paragraph and formatting logic.
What should be cleaned up before export
A professional workflow clearly separates content work from output format. First, the content is editorially finalised: spelling, style, facts, image rights and chapter structure should all be complete. The document is then technically cleaned up and formatted.
Clear style templates for chapter headings, subheadings, body text, quotations, lists and captions are helpful here. A consistent hierarchy is also important. If a chapter is set up as a first-level heading, subsections should not merely be formatted to appear visually smaller, but should be marked up as subordinate headings. This structure will later produce a usable table of contents.
How to create a readable EPUB for your book
After conversion, quality control begins. The EPUB should not be viewed in a preview alone. Different devices and reading apps interpret files differently. What looks neat on a desktop can lead to large gaps, unfavourable image breaks or truncated tables on a small screen.
First, check the navigation. Are all chapters present in the table of contents? Do the entries jump to the correct location? Does each chapter sensibly begin on a new view? Particularly with non-fiction books, a precise table of contents makes it easier to access individual topics and increases the practical value of the e-book.
This is followed by a visual check of the text. Check headings, paragraphs, emphasis, lists, quotations and scene breaks. For fiction, a smooth reading flow is essential. For guides, textbooks and specialist publications, there is the additional requirement that tables, information boxes and figures must remain comprehensible. Some design elements that work excellently in print require a simplified alternative in EPUB.
Images should be sufficiently large but sensibly compressed. Images that are too small lose detail; files that are too large increase loading times and unnecessarily inflate the file size. Captions must be assigned to the correct image. Also use descriptive alternative texts where images are relevant to the content. This improves accessibility for people who use text-to-speech functions or assistive technologies.
Metadata is also part of the production process. The book title, author name, language, publisher or imprint, year of publication and description should all be entered completely and consistently. A professional cover is likewise part of the EPUB file, but does not replace the clean technical setup of the actual book content.
When a fixed layout makes more sense
Not every book benefits from a freely flowing EPUB. Illustrated books, comics, cookbooks with complex double-page spreads, richly designed children's books or workbooks with precise entry fields may require a fixed layout. In such cases, the page is retained as a design surface. The result looks closer to print, but is less flexibly readable on small screens.
The decision depends on the content, not on a general rule. A novel should typically adapt to reading needs across different devices. A visually conceived art book may protect its page composition more strictly. Those who offer both can plan different editions depending on the sales platform and target audience.
Common Mistakes in Book Conversion
A common mistake is treating the print PDF as an e-book without any changes. This leaves page numbers in the text, headers repeating between chapters, or blank pages creating unnecessary interruptions. Footnotes can also be problematic if they are not linked or properly prepared at the end of the text.
Tables are equally critical. Wide tables rarely fit on narrow displays. Depending on the content, it may be better to convert them into lists, shorter tables, or individual sections. Formulas, special characters, and cross-references must also be carefully checked. An EPUB is not a scaled-down print book, but an independent digital edition.
Those who have the conversion professionally managed save time above all in areas where technical review and editorial judgment come together. In Scribigo's publishing service, file conversion can be integrated into a seamless workflow – from final text editing through typesetting and cover design to the publication-ready file. This reduces friction between manuscript, print edition, and e-book.
A good EPUB is barely noticeable to readers. Chapters open in the right place, the text follows their settings, images support the content, and navigation works without a second thought. That is precisely the goal: your book should not feel like a converted file on an e-reader, but like a book made for digital reading.
Before moving on to formatting and conversion, your text should be error-free. Try the AI proofreading directly on your own manuscript: test 50,000 characters for free – no credit card required.
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