How to Read EPUB on iPhone and iPad

Apple made EPUB a first-class format on iOS a long time ago, but the experience still confuses people because Safari downloads an EPUB file instead of opening it, and there's no obvious "open with" prompt. Here's what actually works, organized by how much friction each path involves.

Fastest path: Apple Books

Apple Books is pre-installed on every modern iPhone and iPad. To load an EPUB:

1. Tap the EPUB file anywhere — email attachment, Safari download, Files app, iMessage — and pick Share
2. In the share sheet, tap Books (or Copy to Books on older iOS versions)
3. The book opens and stays in your Apple Books library, syncing to other Apple devices through iCloud

This works for any DRM-free EPUB (.epub extension). It does not work for DRM-protected files from Kindle, Kobo, or a library — those have to stay in the app that purchased or loaned them.

Apple Books renders EPUBs with its own layout engine, which is usually fine but occasionally ignores CSS your book depends on. If a specific book looks wrong in Apple Books, switching to a third-party reader is the fix.

When Apple Books isn't enough: third-party readers

Three free readers worth installing on iOS:

• KyBook 3 — the most capable EPUB reader on iOS. OPDS catalog support, custom fonts (drop a .ttf into the app), dictionary lookup, FB2 and CBZ support. Power-user focused; the interface is busy.
• PocketBook Reader — wide format support (EPUB, FB2, CBR, DjVu, MOBI, PDF) with a cleaner interface than KyBook. Free with ads; a one-time purchase removes them.
• Yomu — minimalist, looks good, iCloud sync. Missing the advanced features but fine for casual reading.

Opening an EPUB in one of these: tap the file → Share → pick the reader app. They all register as "open in" handlers once installed.

Zero-install path: read in the browser

If you don't want another app, or you're on a borrowed device, open the EPUB directly in Safari. The Epublys reader is a browser-based EPUB viewer that runs entirely on-device — your file never leaves the phone. Drop the file in, read it. Works on every iOS version with a modern browser. Useful for a one-off read when installing another app is overkill.

Common scenarios

• EPUB in an email attachment: tap the attachment → Share → Books (or your preferred reader).
• EPUB on Dropbox, iCloud Drive, or Google Drive: open the cloud app → tap the file → Share → target reader.
• EPUB from Project Gutenberg or Standard Ebooks: in Safari, tap the .epub download link → Share → Books. Prefer the plain "EPUB" link over "EPUB with images" — Apple Books sometimes chokes on the latter.
• PDF you'd rather read reflowed: run it through the PDF to EPUB converter first, then open the output in any reader. PDFs are fixed-layout and look terrible on a phone screen; EPUB reflows to the width.

What about DRM-protected books?

DRM-wrapped files cannot be opened outside the app that purchased them:

• Kindle books: use the Kindle app. Amazon uses AZW3/KFX, not EPUB — see the EPUB vs MOBI comparison.
• Library loans via Libby: stay in the Libby app. The file is time-limited and DRM-wrapped.
• Kobo books: use the Kobo app. Kobo uses EPUB but with Adobe DRM applied.

Android, Windows, Mac, Kindle

For other platforms, see the related guides: Android, every device, and Kindle.

Related

• Epublys Reader — browser-based EPUB and PDF viewer
• How to read EPUB on Android
• How to open EPUB files on any device
• What is an EPUB file?
• Convert PDF to EPUB