EPUB vs PDF: Which Should You Use?
Choose EPUB when the text should resize for the screen, or PDF when the exact page layout needs to stay the same.
Choose EPUB when the book is mainly text and should be comfortable on any screen. Choose PDF when the page design must not move, or when people need to print and refer to fixed page numbers.
Many books should have both. The EPUB is for reading; the PDF is for printing, worksheets, citations or an exact visual edition.
The difference is what happens to the page
In an EPUB, the reader can change the font, text size and margins. The words rearrange to fit, so a chapter may be 12 screens on one device and 30 on another.
In a PDF, every item stays at a fixed position on a fixed page. That protects design but can make a normal A4 or Letter page painfully small on a phone.
How to choose for your document
Open the source and look at the content
A novel, report or manual with normal headings and paragraphs usually suits EPUB. A form, poster or designed workbook usually suits PDF.
Think about the smallest screen
If someone will read it on a phone, test whether the text can resize comfortably.
Make the output from the original source
Use Word, Markdown or the design file. Avoid converting PDF to EPUB unless the PDF is the only source you have.
Test the behaviour
For EPUB, change font size and use the chapter menu. For PDF, zoom, print a page and check that nothing is cut off.
Common problems
The EPUB reads columns in the wrong order
The source PDF stored text by page position.
Rebuild from the original document or correct the EPUB after conversion.
The PDF is unreadable on a phone
The fixed page is wider than the screen.
Provide an EPUB version.
Page references no longer match
EPUB page breaks change with reader settings.
Refer to chapter and section names, or provide the fixed PDF edition for page citations.
Frequently asked questions
Can an EPUB be printed?
It can be turned into pages, but the layout varies. Make a dedicated PDF when printing matters.
Can a PDF change font size?
A reader can zoom the page, but the text does not rearrange like EPUB text.
Which is better for accessibility?
Either can be made accessible. Reflowable EPUB often makes resizing easier, while a properly tagged PDF can preserve accessible structure in a fixed edition.
Should I provide both?
Yes when readers need both comfortable screen reading and a printable fixed version.
Extra: Why PDF to EPUB can be messy
A PDF remembers where each piece of text sits on the page, but it may not clearly say which line is a heading, where a paragraph ends or which order two columns should be read in. An EPUB needs that reading order.
A converter has to guess. Simple single-column documents can work well; columns, footnotes, repeated headers and scanned pages often need cleanup. Use the Word or other authoring source whenever you have it.
