---
source_url: "https://readest.com/?utm_source=openai"
title: "Readest — Free Open-Source EPUB & PDF Reader for All Platforms"
mirrored_at: 2026-08-29T13:02:45.466Z
host: readest.com
cited_in_42a: true
mirror_canonical: "https://index.42a.ai/readest.com/index__q__utm_source_openai"
---

> **Original source:** https://readest.com/?utm_source=openai

## You Read, Digest and Get Insight.

Readest is a free, open-source EPUB and PDF reader designed for deep, immersive reading. Enjoy highlights, notes, split-screen reading, text-to-speech, and cloud sync across macOS, Windows, Linux, Android, iOS, and the Web.

## Parallel Read,  
Side by Side.

Compare texts, translations, or ideas with **Parallel Read**, our split-screen book reader. Read two ebooks or documents side by side — perfect for researchers, students, language learners, and anyone who reads more than one book at a time.

## Read books  
in style.

Personalize your reading experience with customizable themes, fonts, and colors. Whether you prefer light mode, dark mode, or a sepia tone, Readest adapts to your eyes and environment for comfortable, distraction-free reading.

## Break barriers with  
effortless understanding.

Instantly translate paragraphs with DeepL integration or look up terms on Wikipedia — right inside your book. Readest's built-in translation and lookup tools make it the ideal ebook reader for multilingual readers and curious minds.

## Refine Your Reading Experience

Explore a powerful EPUB and PDF reader packed with features for curious, passionate readers — from annotations to text-to-speech and cross-device sync.

Shuffle Icon

### Parallel Read

Read two books side by side in split-screen view with synchronized scrolling and navigation.

Signal Icon

### Reading Essentials

Highlight passages, bookmark pages, take notes, and search across your entire ebook library.

Magic Icon

### Customization

Adjust fonts, margins, line spacing, and theme colors for a comfortable, personalized reading experience.

Door Icon

### Smart Tools

Look up words, translate text with DeepL, and browse Wikipedia — all without leaving your book.

Cards Icon

### Cross-Platform Sync

Pick up where you left off on any device. Your highlights, notes, and reading progress sync automatically.

Talking Icon

### Read Aloud

Listen to any ebook with AI-powered text-to-speech (TTS). Turn your reading into an audiobook experience.