Making or buying an ebook often means choosing between PDF and EPUB — both look like "ebook files" on the surface, but their underlying design philosophy is completely different, and each suits a different kind of content.
PDF: fixed layout, what you see is what you get
Every character and image in a PDF sits at a precisely fixed coordinate, and it never reflows based on screen size. That's a huge advantage for content where layout matters (textbooks with charts and text tightly paired, magazine layouts, art books with careful design) — it guarantees the designer's exact layout intent shows up identically on any device.
PDF's downside: a rough experience on small screens
Reading a fixed-layout PDF on a phone-sized screen means either text too small to read comfortably (constant zooming) or, once zoomed in, constant horizontal scrolling to read a full line — this is a limitation inherent to the format, not a particular reader app's fault.
EPUB: reflowable, adapts to the screen
EPUB is essentially closer to a packaged web page: content is stored in an HTML-like structure, and the reader recalculates line breaks and pagination in real time based on screen size and the user's chosen font size. The same book shows a different amount of text per page on a phone versus a tablet, but every screen fills comfortably — no zooming or horizontal scrolling needed.
Which one to choose
- Good fit for PDF: textbooks, image-heavy magazines, art books with precise design, anything meant to be printed — layout is part of the content itself.
- Good fit for EPUB: mostly-text novels and long-form articles, where comfortable reading matters more than exact layout, especially for phone reading.
What if your book is already a PDF?
If your ebook is already in PDF form and you need to change some text (updating version info, fixing a typo) or reorder pages, you can edit the existing PDF directly with LocalPDF — no need to convert to another format first.
Need to fix something in a PDF-format ebook? Edit it directly.
Open LocalPDF →