Latest

Release Note · Kotlin Toolkit Version 3.2.0

We are pleased to announce version 3.2.0 of the Readium Kotlin Toolkit. This release brings animated page transitions to EPUB, adds support for fetching remote EPUB resources, and includes a number of fixes and housekeeping improvements.

Release Note · Swift Toolkit Version 3.9.0

We are happy to announce the release of the Readium Swift Toolkit 3.9.0. This update delivers major performance gains for PDF, brings a series of refinements to the EPUB and PDF navigators, and introduces the new Playground app.

Support for RTL and CJK in Readium Web

We are pleased to announce the support for Right-to-Left and CJK (Chinese, Japanese, Korean) scripts in Readium Web!

Audiobooks support in Readium Web

We are pleased to announce the support for audiobooks in Readium Web. This support is built on top of a new Audio Navigator in TS-Toolkit, which provides everything you need to build an audiobook reader.

Readium Dev Day 2026 · An invitation to our interactive session for developers

Join us in Prague on June 10th for a chance to meet the team and talk about the future of Readium. Registrations are open until April 3rd.

Release Note · Swift Toolkit Version 3.8.0

We are happy to announce a new update to the Swift toolkit, which focuses on strengthening the security of LCP repositories and improving the reading experience for Fixed-Layout (FXL) EPUBs.

Content Protection in Readium Web

We are pleased to announce the release of new features in Readium Web: the Content Protection API, the Peripherals API, and a listener to customize the context menu.

What's New in Readium Mobile? · Q4 2025

In this new instance of "What's New in Readium Mobile", we discuss topics ranging from our extended Beta for Thorium Mobile to our localization strategy.

Release Note · Readium CSS 2.0

We are pleased to announce the release of a stable version 2.0.0 of Readium CSS, the library of styles that enables the EPUB reading experience in Readium toolkits and Thorium applications.

Using custom fonts with Readium Web

Use any custom font, including accessible ones, with this new release for Readium Web. Available for testing in the Playground.

Assessing the accessibility of your backlist with Readium CLI

Discover how the Readium CLI can help you to extract metadata and prepare to remediate your EPUB backlist.

Release Note · Swift Toolkit Version 3.7.0

We are pleased to release the Readium Swift Toolkit 3.7.0. This update brings significant improvements to how comics are handled, improves performance for large documents, and streamlines our localization sources.

EAA with Readium: Customizing text and layout in digital publications

Visual accessibility is one of the cornerstones of creating an inclusive digital experience, but it is also a very challenging one to tackle, because it does not have a one-size-fits-all solution.

Release Note · Swift Toolkit Version 3.6.0

We are happy to announce the release of the 3.6.0 version of the Swift toolkit. This new version focuses on refining the user experience for fixed-layout publications.