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Apple Books has one of the nicest reading experiences on any device: beautiful typography, adjustable fonts and sizes, sepia and dark themes, scrolling or page-turn modes, synced highlights across your iPhone, iPad, and Mac.
Unless you’re reading a PDF. Then you get none of it.
Open a PDF in Apple Books and the entire appearance menu disappears. No font size. No typeface. No themes. No reflow. You’re looking at a fixed photograph of a printed page, and on a 6.1-inch iPhone screen that means pinch-zoom-pan on every paragraph. This isn’t a bug — PDFs aren’t reflowable, and Apple’s own support stance is that you can’t change anything about how a PDF displays without editing the PDF itself.
The fix is simple in concept: Apple Books treats EPUBs as first-class citizens. Convert the PDF to EPUB and every reading control comes back. This guide shows you how — including the import steps that trip people up on iOS.
PDF vs EPUB in Apple Books: What You Actually Get
| Feature | PDF in Books | EPUB in Books |
|---|---|---|
| Adjust font size | ❌ | ✅ |
| Choose typeface (Georgia, Palatino, etc.) | ❌ | ✅ |
| Sepia / dark / night themes | ❌ | ✅ |
| Text reflows to fit screen | ❌ | ✅ |
| Chapter navigation from TOC | Depends on PDF bookmarks | ✅ |
| Comfortable on iPhone-size screens | ❌ | ✅ |
| Zoom & pan | ✅ (you’ll need it) | Not needed |
The pattern is the same one we’ve covered for Kindle and Kobo: every reading app is great at its native reflowable format and merely tolerates PDF. If you want the real reading experience, convert the document — don’t fight the viewer.
For a deeper look at the two formats themselves, see PDF vs EPUB: The Complete Guide.
Step 1: Convert Your PDF to EPUB
Three routes, depending on your document.
Option A: Free browser tool (simple PDFs, works on iPhone)
For clean, text-based, single-column PDFs, our free PDF to EPUB converter runs entirely in the browser — including Safari on your iPhone or iPad. Nothing is uploaded; the conversion happens on your device.
- Open the tool in Safari.
- Pick your PDF from the Files app and convert.
- Download the EPUB — it lands straight in Files, one share-sheet tap away from Books.
While you’re at it, the EPUB metadata editor lets you fix the title, author, and cover so your Books library doesn’t fill up with “scan_final_2” entries.
Option B: Calibre (free, desktop)
Calibre converts PDF to EPUB on your Mac for free. It does a passable job on simple, digitally-born PDFs and a poor job on everything else — multi-column layouts come out in the wrong order, tables collapse, and scanned pages produce nothing. We compared outputs in detail in PDF2EPUB vs Calibre.
Option C: AI conversion (textbooks, papers, scans)
For complex documents — the ones you’d actually want reading comfort for — PDF2EPUB.ai uses multimodal AI (Google Gemini) that reads each page visually: columns, tables, formulas, footnotes, chapter structure. It rebuilds everything as a clean EPUB with a working table of contents, and its AI OCR handles scanned PDFs that no rule-based converter can touch.
- Upload at pdf2epub.ai — free credits on signup.
- Preview with Test Mode (first few pages) before spending credits.
- Download the EPUB.
Step 2: Get the EPUB Into Apple Books
This is the part most guides skim. On Apple platforms there are four clean paths:
On iPhone / iPad:
- Files app: Locate the EPUB in Files, long-press → Share → Books (or just tap the file — Books is the default EPUB handler).
- AirDrop: Send the EPUB from your Mac; iOS offers to open it in Books automatically.
- Safari download: If you converted in the browser, tap the download, then the share icon → Books.
On Mac:
- Drag and drop the EPUB onto the Books window (or File → Add to Library).
With iCloud enabled for Books, the EPUB — along with your reading position, highlights, and notes — syncs across all your devices. Add it on the Mac, keep reading on the iPhone in the checkout line.
What About Just Keeping the PDF?
Sometimes that’s the right call. Keep the PDF as-is when:
- Layout is the content — sheet music, slide decks, forms, comics, design portfolios
- It’s a short document you’ll read once on an iPad-size screen
- You need to see the original pagination (citing page numbers in a paper)
The iPad’s larger screen makes raw PDFs tolerable in a way the iPhone never will. But “tolerable on iPad” still means no night theme, no font control, and no reflow — for anything book-length you plan to actually read, EPUB wins.
The Bottom Line
Apple Books isn’t a bad PDF viewer — it’s a great EPUB reader that politely declines to pretend PDFs are books.
- Simple text PDF → convert free in your browser with the PDF to EPUB tool, share to Books, done.
- Textbook, paper, or scan → AI conversion at PDF2EPUB.ai is the only route that preserves structure — free credits on signup, Test Mode to preview first.
Five minutes of conversion buys you every reading feature Apple built — on every Apple device you own.