koreader

Name: koreader
Brand: koreader

Open‑source, multi‑format ebook reader for Android, Mac and Linux

softwareE-Book ReadersEbook ReaderMulti-formatCross-platform

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Our Verdict

Best for

Students and readers of multiple formats

Skip if

Those seeking seamless large library management

What is koreader?

KOReader is a free, open‑source ebook reader that supports a wide range of formats, from EPUB and PDF to MOBI and DJVU. It runs natively on Android tablets, macOS computers and Linux desktops, offering a consistent reading experience across devices. Designed for avid readers and students, KOReader provides powerful annotation tools, customizable layouts, and seamless integration with cloud storage, making study and leisure reading efficient and enjoyable.

SpecificationsAI-estimated

open source✅ Yes

github stars28,032

api available❌ No

support optionsCommunity Forum, GitHub Issues

key integrationsDropbox, Google Drive, Nextcloud, Calibre

primary languageLua

Key Features of koreader

Supports over 20 ebook and document formats, including EPUB, PDF, MOBI, and DJVU, ensuring you can read any file you own.

Offers a fully customizable interface with adjustable fonts, margins, line spacing, and themes, including a true‑dark night mode for low‑light reading.

Provides robust annotation capabilities such as highlights, notes, bookmarks, and text-to-speech, all saved locally and exportable.

Integrates with cloud services like Dropbox, Google Drive, and Nextcloud, allowing you to sync your library and reading progress across devices.

Features a built-in dictionary and Wikipedia lookup, enabling instant word definitions and reference lookups without leaving the page.

Optimized for e‑ink devices and tablets, delivering fast page turns and low power consumption for extended reading sessions.

Allows scripting and plugin extensions via Lua, letting power users add custom functionality or automate workflows.

Supports PDF reflow and text extraction, making PDFs more readable on small screens and improving navigation.

Use Cases for koreader

Academic Research

Read, annotate, and organize scholarly PDFs and e‑books for coursework and research.

Leisure Reading

Enjoy novels and magazines with customizable fonts and night mode for comfortable long sessions.

Language Learning

Use built‑in dictionary and text‑to‑speech to study new languages directly within the reader.

Document Review

Collaborate on drafts by highlighting and adding notes, then export annotations for sharing.

Pros & Cons of koreader

Pros

Free and open‑source with no ads
Runs on Android, macOS and Linux from a single code base
Extensive format support eliminates the need for multiple apps
Highly customizable UI and powerful annotation tools

Cons

Limited official support; relies on community for troubleshooting
Occasional UI quirks on newer Android versions
Sync features depend on third‑party cloud services rather than native cloud

Frequently Asked Questions

Is KOReader available for Windows?

Officially KOReader is not packaged for Windows, but it can be compiled from source or run via WSL.

Can I sync my reading progress across devices?

Yes, using cloud services like Dropbox, Google Drive, or Nextcloud you can store your library and progress files to sync across installations.

Does KOReader support DRM‑protected books?

KOReader does not include DRM removal; it can only open DRM‑free files.

How do I contribute to the project?

Contributions are welcome via GitHub; you can submit pull requests, report issues, or help with documentation through the community forum.

Pricing Overview

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Free

Detailed plans are not listed. Visit the official website for pricing information.

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Top Alternatives & Similar Tools

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Calibre

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Calibre is a comprehensive e-book management software that allows users to organize, convert, and read e-books in various formats. It supports a wide range of file formats, including EPUB, MOBI, and PDF, and can also convert e-books to different formats for compatibility with various devices.

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