GemReader: EPUB & PDF Reader

Gemperial

In-app purchases

About this app

GemReader is an offline EPUB and PDF reader that saves everything you do inside a book — your form answers, highlights, notes, and flashcards. Built for people who read to learn, not just to finish.

No account. No ads. No tracking. Your library is encrypted on your device.

YOUR FORM ANSWERS ARE SAVED
Most ebook readers throw away what you type. GemReader doesn't. Fill in a workbook exercise, close the book, come back a week later — your answers are exactly where you left them. Every text field, checkbox, dropdown, and radio button in an interactive EPUB is saved automatically.

HIGHLIGHT AND ANNOTATE
Highlight passages in six colors and attach a note to any highlight. Add standalone text notes, bookmarks, and notes pinned to images. Notes support Markdown. Tag anything you keep, name the highlight colors yourself, and see every highlight and note from your whole library in one searchable list.

STUDY TOOLS BUILT IN
Look up any word in the in-book dictionary without leaving the page. Turn highlights into flashcards or cloze cards and review them on an FSRS spaced repetition schedule. Cite any highlight in APA, MLA, Chicago or BibTeX. Export to Anki, Obsidian or Markdown, or import your .apkg and .txt decks.

FREE BOOKS TO START WITH
Browse Project Gutenberg, Standard Ebooks and other open catalogs from inside the app and download straight into your library. Add any OPDS catalog you trust. Downloads are encrypted on arrival, like every other book.

LISTEN TO YOUR BOOKS
A neural text-to-speech voice reads any book aloud, generated entirely on your device — no cloud, no account, and no connection needed once the voice is installed. Books that ship with their own chapter audio play that instead, with lock-screen playback controls.

PDF READER INCLUDED
Highlight and underline PDFs, add notes, and fill in PDF forms. Links, pinch-to-zoom, full-text search and dark mode.

MORE THAN EPUB
Also opens comics (.cbz), FictionBook (.fb2, .fbz) and plain-text (.txt) books.

ENCRYPTED LIBRARY
Your books are encrypted at rest with AES-GCM. No plaintext file ever touches disk. Lock individual collections behind their own key, and lock the whole app when you put it down. Your books stay yours.

BUILT FOR OFFLINE READING
Everything works with the network off. No account is required. Backups go only where you choose: a folder on your phone, or your own Google Drive.

ORGANIZE A REAL LIBRARY
Grid and list views, nested collections with custom colors, cover art, full-text search across your library, table of contents, footnotes, image zoom, and reading history so you can jump back to where you were three chapters ago.

MADE COMFORTABLE TO READ
Light, dark, sepia, and high-contrast Ultra themes. Adjustable fonts, margins, and layout. Immersive full-screen reading. Downloadable font packs for CJK and non-Latin scripts. Tablet and split-screen support. Interface in 18 languages. Automatic pinyin over Chinese text.

SHARE WITHOUT THE CLOUD
Gem Beam hands a book, or a whole collection, to the phone next to you over a private Wi-Fi link. One device shows a code, the other scans it, and the books cross directly — no internet, no account, nothing leaving the room. Highlights, notes, reading position and study progress travel with them. You can also export a book as an encrypted .gem pack, optionally as a scannable QR code, or turn a favorite passage into a shareable quote card image.

A private EPUB reader and ebook reader for students, language learners and researchers. Opens large EPUBs up to 200MB. Import from your device, share a file into the app, or download directly through the in-app browser.

What’s new

Gem Beam codes now open GemReader from your phone's camera, and Beam works on Android 10 to 12. Bookmarks land on the page you are reading. A new privacy option stores books as fixed-size encrypted pieces. A cleaner, more consistent look, with easier-to-read text and smoother animations. Landscape phones open PDFs fit to width. Fixed: typed text not showing in search fields, highlights shifting next to bookmarks, tiled pictures in dark PDFs, and the Beam code not showing.