Thorium Reader 3.4.0 for Mac

Mac Utilities

Updated Aug 15, 2026

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Thorium Reader is a free reading app from EDRLab, a non profit group that works on open reading standards. It opens EPUB books, PDF documents, DAISY titles and audiobooks in one tidy library, and it takes accessibility seriously. Text size, spacing, fonts and colour themes can all be adjusted, and it works well with VoiceOver. There are no ads and no account is needed. Library users will also value its support for LCP protected loans.

Key Features

• Reads EPUB 2 and EPUB 3 books in flowing text and fixed layout forms
• Opens PDF documents, DAISY books and Readium audiobooks in one library
• Supports LCP protected books, so library loans open correctly
• Bookmarks, annotations, full text search and a read aloud option
• Rich display controls for font, spacing and themes, plus OPDS browsing

How to Download

1. Download from the official site and choose the macOS build.
2. Open the downloaded disk image and move Thorium Reader into Applications.
3. Launch the app, import your first book, and start reading.

System Requirements

Thorium Reader runs on current versions of macOS on Intel and Apple Silicon Macs. It is a modest app, so any Mac used for reading and study will run it well.

FAQs

Is Thorium Reader really free?

Yes. EDRLab gives the app away with no ads. Grants, members and reader donations fund the project.

Can Thorium Reader open books borrowed from my library?

In most cases, yes. It supports LCP protected publications, the system many public libraries use for lending.

Does Thorium Reader work with a screen reader?

Yes. It works with VoiceOver on macOS and offers keyboard navigation and larger text options.