Thorium 3 support

Thorium 3 documentation s available as EPUB, different translations are available thru the Thorium documentation catalog. You can Add Documentation catalog to Thorium (OPDS link) or browse English documentation inline within the Readium web reader.

Welcome to the Thorium Reader documentation

For digital books, comics, audiobooks and PDF documents, including those protected by the LCP DRM (DRM meaning Digital Rights Management) on Linux, macOS, and Windows 10.

Thorium is available in many languages; each update offers new ones thanks to the community. Thorium Reader is also being made accessible for visually impaired and dyslexic people.

A libre and gratis app, with no advertising or leakage of private data, and features for heavy readers, library users and students. Made by EDRLab


For everyone means any visual impairment, and even blind people. Compatible with JAWS, NVDA, Narrator, and VoiceOver screen readers. A read-aloud feature with visual highlighting also helps. Colors, text size, spacing, font and layout can be adjusted. When used with mouse or keyboard, keyboard shortcuts can be set up.

You can learn more about the accessibility features of Thorium-Reader. Specific info on key assistive technologies such as screen readers is provided as necessary.

Readium LCP DRM

Thorium Reader supports the DRM Readium LCP, originally designed by the Readium Foundation. The specification of this DRM is public, and it is an ISO technical specification under the reference ISO 23078-2.

LCP has already been adopted by many public libraries, universities and booksellers around the world (A list of distributors supporting LCP is maintained here).

Publishing organizations around the world are encouraged to adopt LCP as a means of protecting digital books from over-sharing, while providing users with a frictionless experience and keeping content properly accessible. Please contact EDRLab if your organization is interested in adopting LCP.

Last modified July 1, 2024