Folio is the ultimate offline reader built for privacy, performance, and total control.

Enjoy a beautifully unified experience for e-books, PDFs, comics, and audiobooks—all stored securely on your device with no accounts, no tracking, and no ads.

Supported Formats

E-Books: EPUB, PDF, TXT

Comics: CBZ / CBR

Audiobooks: MP3, M4A, M4B, OGG, WAV

✨ A Beautiful & Customizable Reading Experience

Folio is designed for comfort, speed, and clarity—your reading, your way.

🎨 Customizable Reader

Adjustable font size, line spacing, margins, and text alignment

Multiple font families including OpenDyslexic

Smooth paginated or scrolled modes

Toggle publisher styles for a clean, uniform look

🌈 Themes That Transform Your Reading

Choose from 12+ handcrafted themes:
Day, Night, Sepia, Solarized, Nord, Dracula, and more.
Or build your own with the Custom Theme Creator.

📘 Advanced EPUB & PDF Engine

Clean Table of Contents navigation

High-fidelity PDF viewer with pinch-to-zoom

Supports text selection, annotation, and smooth page transitions

🎧 Immersive Audiobook Experience

Your audiobooks feel better in Folio.

Playback speed control (0.75× — 2×)

15-second skip

Background play with Media Session controls

Read Aloud (TTS) using device voices

Optional high-quality local Piper TTS for a natural, offline voice

📁 Powerful Library Organization

Stay organized effortlessly—even with thousands of books.

Offline-First: All data stays on your device

Filter by Reading / To-Read / Completed

Sort by Last Read, Date Added, Title, or Author

Create unlimited Collections

Mark favorites with a star

Edit metadata (title, author, cover image)

Auto-download covers from online sources

🌐 Discover Books Instantly

Find your next great read with Folio’s federated search.

Search multiple free sources at once:

Open Library

Project Gutenberg

Standard Ebooks

LibriVox

Download directly into your Folio library with a single tap.
New users get a curated list of trending classics to start reading immediately.

🧠 AI-Powered Learning & Productivity

Folio is more than a reader—it’s your personal knowledge workspace.

⚡ Instant AI Dictionary

Highlight any word or phrase to get a fast, AI-generated definition.

📘 Auto Vocabulary Builder

Every defined word is automatically saved with:

Definition

Example sentence

Link back to the original book

🖍 Rich Highlighting & Notes

Highlight in multiple colors

Add written notes

Attach voice memos

Draw sketches or diagrams

Insert images

All highlights and notes from all books are available in one centralized hub.

🤖 AI Note Assistant

Let AI help you learn and organize:

Summarize long notes

Auto-generate smart titles & tags

Clean, structured note insights

📈 Track Your Reading Journey

Stay motivated with beautiful visual insights.

Daily reading streaks

Minutes read per day

Total reading time

Books completed

Annual book goals

Historical charts of your reading habits

🔒 Total Privacy. No Accounts. No Cloud.

Folio is built with privacy first:

No registration

No tracking

No online sync

Everything stored locally

Your library belongs to you alone.

💡 Why Readers Choose Folio

Works fully offline

Unified reader for books, PDFs, comics & audiobooks

Beautiful, fast, distraction-free design

Smart tools for learning, research, study, and journaling

Supercharged by AI but does not require internet

No ads, no accounts, no tracking

📥 Download Folio today and rediscover the joy of reading.

Your library. Your rules. Your privacy.