PDF vs EPUB: which format should you use?
PDF and EPUB both deliver documents, but they behave completely differently once opened. PDF is a fixed-page format — the layout, fonts, and page breaks are locked in. EPUB is a reflowable format — the text resizes and re-wraps to fit whatever screen you're reading on. For anything you'd read from cover to cover, EPUB is almost always the better experience.
Head-to-head comparison
| Aspect | EPUB | |
|---|---|---|
| Layout | Fixed pages | Reflowable text |
| Reading on a phone | Painful (pinch to zoom) | Native (text resizes to fit) |
| Reading on a laptop | Fine | Fine |
| Print quality | Perfect | Not designed for print |
| Fonts | Embedded exactly | Reader's preferred font |
| Highlights + bookmarks | Works but clunky | Native and clean |
| Best for | Contracts, cookbooks, comics | Novels, non-fiction, textbooks |
| Worst for | Long-form reading on phones | Anything with fixed layout |
When to use each
Use PDF when
- The layout must not change (contracts, forms, invoices)
- You need pixel-perfect fidelity (cookbooks, graphic-heavy books)
- You're printing the document
- You're distributing to an audience that expects PDF (universities, courts)
Use EPUB when
- The document is a book meant to be read cover to cover
- You're reading on a phone, tablet, or e-reader
- You want font size to adjust to comfortable reading
- The book is text-heavy without dependence on visual layout
The verdict
Ship PDFs to people who'll print, sign, or store the file. Ship EPUBs to people who'll read the book. Converting between them is easy but not always ideal — PDFs of text-heavy novels reflow to EPUB beautifully, but PDFs of illustrated books lose their design when forced to reflow.
Frequently asked questions
Why does the same book look different on my Kindle vs on my phone?
EPUBs are reflowable — the reader app decides how text wraps based on screen size, font size, and margins. A 6-inch Kindle at large font shows fewer words per page than a phone at small font, so page numbers, chapter breaks, and layout shift. This is a feature, not a bug — it's what makes EPUB readable on any device.
Can I annotate an EPUB the way I can a PDF?
Yes, but the annotations are tied to your reader app, not the file. Kindle, Apple Books, Google Play Books, and Kobo all support highlights and notes on EPUB. The catch: annotations don't travel between apps. If you highlight in Kindle and switch to Kobo, the highlights don't come along unless the app syncs to a shared cloud.
Why is my converted PDF-to-EPUB missing images or looking broken?
PDF converters extract images and reflow text, but they can't recreate the original design. Multi-column PDFs, sidebars, and figure captions often end up jumbled. Text-heavy novels convert well; illustrated cookbooks, magazines, and technical books with diagrams usually don't. For those, keep the PDF.
Does Kindle actually support EPUB now?
Yes since late 2022. Amazon's Send-to-Kindle service (via email address or app) accepts .epub files directly and converts them to Kindle's native AZW3 or KFX format on delivery. The old requirement to convert EPUB → MOBI first is gone. Some older Kindle devices may not render EPUB's newer features well.
Which format is better for accessibility?
EPUB by far. Screen readers can navigate an EPUB by heading, adjust font size, invert colours, and use dyslexia-friendly fonts because the text stays semantic. PDF stores text as positioned glyphs, so accessibility depends on whether the PDF has a proper tag tree — most don't.
Can I print an EPUB?
Not directly — EPUBs have no fixed page size, so you'd get whatever your reader app decides to render on a print job. Convert to PDF first (any reader app can export), then print the PDF. This is the reverse of the normal EPUB → device flow, and it works fine.
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