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Thorium Reader

Thorium Reader

Modern, highly accessible reading app for EPUB, PDF, Daisy books, audiobooks and digital comics.

Thorium Reader

Thorium Reader is an easy to use EPUB reading application for Windows 10/10S, MacOS and Linux. After importing e-books from a directory or OPDS feed, you'll be able to read on any screen size, customize layout settings, navigate via the table of contents or page list, set bookmarks ... A great care is taken to ensure the accessibility of the application for visual impaired people using NVDA, JAWS or Narrator.

Free application. No ads. No private data flowing anywhere.

This project is in constant evolution, corrections and new features will be added soon and your support is welcome for that. The application is based on the open-source Readium Desktop toolkit.

It is currently localized in following languages:

  • English
  • French
  • Portuguese
  • Swedish
  • Russian
  • Lithuanian
  • Italian
  • Japanese
  • Dutch
  • Spanish
  • German
  • Finnish
  • Chinese
  • Korean
  • Georgian


library publication info reader

Build status

TravisCI, develop branch:

Build Status


  1. NodeJS 14 (check with node --version)
  2. NPM 6 (check with npm --version)
  3. Optionally: C++ compiler for native NodeJS modules, should work out of the box in Linux and MacOS. On Windows, Visual Studio can be installed, or simply call npm install -g windows-build-tools.


  • typescript
  • electron
  • reactjs
  • redux
  • saga
  • i18next

Quick start

Install dependencies

  • npm install (or npm ci): initialize local node_modules packages from dependencies declared in package.json (this will also automatically call a long-running compilation stage in npm run postinstall)
  • in case of failure to NPM "install" because of "Divina player" SHA integrity mismatch, please try running the following command in your shell: node scripts/package-lock-patch.js && cat package-lock.json | grep -i divina-player-js (this converts SSH GitHub references to HTTPS ones)
  • in case of NPM / Node GYP failing to compile native libs in Windows under Visual Studio 2019's command line tools: npm config set msvs_version 2019 --global and npm config set msbuild_path "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\MSBuild.exe" (adjust with your own path, for example Enterprise or Professional instead of Community)

Start application in development environment

(with hot-reload dev server, web inspectors / debuggers)

  • npm run start:dev (or npm run start:dev:quick to bypass TypeScript checks / launch the app faster)

Start application in production environment

  • npm start (or npm run start)

Build installers

  • npm run package:win or npm run package:mac or npm run package:linux

Code Signing information:

Command line

thorium <cmd> [args]

  thorium opds <title> <url>  import opds feed
  thorium import <path>       import epub or lpcl file
  thorium read <title>        searches already-imported publications with the
                              provided TITLE, and opens the reader with the
                              first match
  thorium [path]              import and read an epub or lcpl file     [default]
  thorium completion          generate bash completion script

  path  path of your publication, it can be an absolute, relative path  [string]

  --version  Show version number                                       [boolean]
  --help     Show help                                                 [boolean]
library library
reader reader

Something missing? Edit this app.

Keyboard Shortcuts

Key Action
/ Focus the search bar
Esc Focus the search bar and cleans it
Select the next search result
Select the previous search result
Enter Open the selected search result
cmdEnter Ctrl+Enter Open the selected search result in a new tab