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Tap + at the top right of the library to import files or whole folders from the Files app. You can also drop files into On My iPhone › OnlyText in the Files app. Your folder structure is kept. While a large import runs, you can see its progress and cancel it; books imported up to that point are kept.

On some file servers, such as many NAS devices, iOS doesn’t show other apps what’s inside a folder on a network drive, so the whole folder can’t be imported at once. Use Import Files, open the folder and select all the files: OnlyText puts them in a folder with the same name. You can also copy the folder to On My iPhone in the Files app first.

TXT, EPUB, MOBI, AZW3, FB2, PDF, DOCX, ODT, RTF and HTML. MOBI and AZW3 Kindle books must be DRM-free. PDFs can be viewed as the original, or read as text with your own font and size.

While reading, open Menu › Encoding and choose another encoding, or convert the file to UTF-8 and save it. OnlyText detects UTF-8, EUC-KR/CP949, Shift_JIS, EUC-JP, GB18030, Big5, UTF-16 and Windows-1252 automatically.

Open Reading Settings to change the font, size, line and paragraph spacing, margins and color theme (Paper, White, Sepia, Green, Gray or Black). You can use fonts installed on your device or add fonts from the Files app, and keep separate settings for a single book.

Tap or swipe, use a keyboard, or press the volume buttons. You can choose the tap zones. Turning pages by tapping the back of your iPhone is an experimental option in Settings › Labs and is off by default.

Yes, as an experimental feature. Turn it on in Settings › Labs (it is off by default). Each paragraph is translated on your device with Apple’s Translation framework or Apple Intelligence and shown with the original: stacked, side by side, or translation only. It is still slow, especially with Apple Intelligence, and it can use a lot of battery and warm up your device. A language is downloaded from Apple the first time you use it, and Apple Intelligence needs a supported device with iOS 26 or later. Your book’s text is never sent to the developer.

Every feature is free for 14 days, and the trial never charges you automatically. After it ends, a one-time purchase is needed to open books. It is not a subscription. Your library, importing, settings and the Apple Watch app keep working. On another device, use Settings › Restore Purchases.

Its first screen is a remote for the book open in OnlyText on your nearby iPhone, even with the iPhone screen off. Tap the screen or use Double Tap (Series 9, Ultra 2 and later) for the next page, turn the Digital Crown to go forward or back, or use the button for the previous page. Double Tap works only with your wrist raised and the screen on, so with your wrist resting, turn the crown or tap the screen. You can adjust page-turn vibration, and on the Watch’s Help screen choose how many crown clicks turn one page (4 by default) and the crown sensitivity. Tap the bookmark button at the top left to see the bookmarks you saved on iPhone, grouped by book. To keep the remote on screen, go to Settings › General › Return to Clock › OnlyText on the Watch and turn on Return to App. The Watch app needs watchOS 11 or later.

Korean, English, Japanese, Chinese (Simplified and Traditional), French, Italian, Portuguese (Brazil), Spanish, Hindi, Indonesian and Russian.