Folio AI: PDF & Ebook Reader

Folio is a modern ebook reader and PDF reader for Android. Read EPUB, PDF, MOBI, AZW3 and comics on beautiful, distraction-free pages, highlight and take notes, listen with text to speech, and ask a built-in AI about any passage. Your library stays in sync across devices, encrypted.

★ ONE READER FOR EVERY BOOK FORMAT
• EPUB reader and PDF reader, plus MOBI, AZW3, AZW, FB2, TXT, Markdown, DOCX and HTML
• Comic reader for CBZ, CBR, CBT and CB7
• Open books straight from Files, Downloads or email with "Open with Folio"
• Browse and download from OPDS catalogs
• Reads offline; no account needed to read

★ A BEAUTIFUL LIBRARY
• Cover grid, list and detailed views, with reading progress on every book
• "Continue reading" picks up exactly where you stopped
• Shelves, favorites and pin to top to organize a large collection
• Filter by unread, reading and finished; search your whole library
• Reading statistics to see your reading time

★ READING, YOUR WAY
• Light, sepia, dark, black and auto themes: a night mode that's easy on the eyes
• Text size, fonts, line spacing and brightness in one quick sheet
• Scroll or turn pages; two-page spreads on tablets
• Tap to hide every control for a clean, full-screen page
• Full-text search inside books, contents, and bookmarks

★ HIGHLIGHTS, NOTES AND ANNOTATIONS
• Highlight in color with one tap, add notes and bookmarks
• Annotate and draw on PDF pages with a pen
• Look up words in the dictionary, Wikipedia or the web
• All highlights and notes in one place, with tags
• Export notes and highlights to Markdown, CSV, HTML, PDF, TXT or JSON

★ AI READING ASSISTANT
• Ask the AI to explain, summarize or discuss any passage
• Translate selected text instantly
• Summarize chapters to recall what you've read
• Text recognition (OCR) makes scanned PDFs readable and searchable
• Automatically recognize a book's title and author on import

★ LISTEN: TEXT TO SPEECH
• Read aloud with your phone's built-in voices, even offline
• Natural-sounding AI voices for long listening sessions
• Turns any ebook into an audiobook, read sentence by sentence

★ SYNC AND BACKUP, PRIVATELY
• Folio Cloud syncs books, reading position, highlights and notes across your phone, tablet and computer
• Every account's data is stored in its own file and encrypted (AES-256)
• Or sync to your own WebDAV or S3-compatible storage
• Sync reading progress with KOReader
• Back up and restore your whole library

★ PRIVACY BY DESIGN
• No ads, no trackers, no analytics
• Your books and notes stay on your device unless you turn on sync
• Delete your account and all of its data at any time, in the app or on the web

ACCOUNTS
Reading, organising, annotating and offline read-aloud need no account. A free Folio account adds a monthly allowance of AI features, AI voices, text recognition and book information look-ups. Folio Cloud sync is included with Pro accounts.

Folio is also available for Windows, macOS, Linux and the web, so your library follows you to every screen.

Privacy policy: https://folio.armorclub.org/privacy
Delete your account: https://folio.armorclub.org/delete-account