Ebook Tools Directory/Ebook Readers/Thorium Reader

Ebook ReadersVerified Authentic ReleaseBSD-3-Clause

Thorium Reader

Highly accessible, standards-compliant EPUB3 and PDF desktop reader developed by EDRLab.

2,935 Stars245 ForksTypeScript / ElectronRelease: v3.5.1

Download Assets Official Website Documentation

Tool Overview

Thorium Reader is the official open-source reading application of the European Digital Reading Lab (EDRLab). Designed with strong accessibility guidelines (WCAG 2.1 AA compliant), it provides support for EPUB 3, PDF, DAISY audiobooks, and visual adjustments for dyslexia, low vision, and screen readers.

System Requirements: Windows 10/11, macOS 11+, or Linux x86_64

Key Capabilities & Features

W3C and WCAG 2.1 AA certified accessibility for visually impaired readers

Full EPUB 3 reflowable, fixed-layout, and media overlays (read-aloud sync)

Integrated text-to-speech with high quality system voices and pacing controls

Full OPDS catalog navigation and library management

Available in over 20 localized languages with zero telemetry or tracking

Package Manager & CLI Installation

Install and update Thorium Reader using your preferred operating system package manager or container runtime:

$ winget install EDRLab.ThoriumReader

Verified Official Release Downloads

v3.5.1

All binaries are sourced directly from the official developer release assets without re-packaging or modifications.

Linux x64Verified

Thorium-3.5.1-amd64.deb

Size: 101.63 MBDownloads: 4,172

Download Linux

Linux ARM64Verified

Thorium-3.5.1-arm64.AppImage

Size: 135.19 MBDownloads: 816

Download Linux

Linux ARM64Verified

Thorium-3.5.1-arm64.deb

Size: 96.29 MBDownloads: 725

Download Linux

macOS Apple SiliconVerified

Thorium-3.5.1-arm64.dmg

Size: 124.13 MBDownloads: 112,373

Download macOS

Windows ARM64Verified

Thorium-3.5.1-arm64.exe

Size: 112.69 MBDownloads: 3,102

Download Windows

macOS UniversalVerified

Thorium-3.5.1-x64.dmg

Size: 132.51 MBDownloads: 14,466

Download macOS

Windows x64Verified

Thorium-3.5.1-x64.exe

Size: 117.77 MBDownloads: 51,193

Download Windows

Linux x64Verified

Thorium-3.5.1-x86_64.AppImage

Size: 134.86 MBDownloads: 3,523

Download Linux

Source Code ZIPVerified

thorium-reader-v3.5.1-source.zip

Size: GitHub Archive

Download Source

Client-Side SHA-256 Binary Integrity Verifier

100% Client-Side. Verified locally in your browser using the Web Crypto API. No files are uploaded.

Drag & drop downloaded binary here, or browse file

Computes SHA-256 hash in real-time to guarantee file authenticity against developer releases.

Security Verification Status: Verified Official EDRLab Release

Downloads link directly to the official GitHub releases hosted by edrlab/thorium-reader. Files are checked for authentic digital developer signatures and verified against open-source repository tags.

Latest Release Changelog (v3.5.1)

Thorium Desktop reader version `3.5.1` was published on **02 September 2026**. ![Total Downloads](https://img.shields.io/github/downloads/edrlab/thorium-reader/v3.5.1/total.svg) Here are links to the "technical" changelogs: * https://github.com/edrlab/thorium-reader/blob/develop/changelogs/CHANGELOG-v3.5.1.md * https://github.com/edrlab/thorium-reader/compare/v3.5.0...v3.5.1 User-friendly release notes and a blog post are published on the https://www.thoriumreader.com website. Expand the 'Assets' section below to reveal the download links. * Note that the terms `x64` and `amd64` in the filenames refer to the Intel computer architecture (also sometimes known as `x86_64`, which includes both Intel and AMD chipsets). * The term `arm64` refers to modern ARM hardware including Apple Silicon "M" computers. If in doubt: * Apple users should download the `arm64` variant. * Windows / Linux users should download the `x64` / `amd64` variants, respectively. The application was built automatically on GitHub (Microsoft) servers. The build was recorded here: https://github.com/edrlab/thorium-reader/actions/runs/33608586429

Specifications & Compatibility

Supported Ebook Formats

EPUBEPUB3PDFDAISYAudiobookDivinaLCP

Supported Operating Systems

WindowsmacOSLinux

Primary LanguageTypeScript / Electron

Software LicenseBSD-3-Clause

Official Repositoryedrlab/thorium-reader

Last Checked & Verified2026-11-08 04:49:32 UTC

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