Latest

Release Note · Swift Toolkit Version 4.0.0-alpha.1

We are happy to announce the first alpha of the Readium Swift Toolkit 4.0.0, a major version focused on Swift 6 and strict concurrency. This release also brings richer accessibility metadata to the Content API, a reworked LCP authentication flow, and a leaner set of packages.

Release Note · July 2026: New features in the TS Toolkit

We are pleased to announce the implementation of the Decorator API in TS-Toolkit, along with Timeline support for HTML publications, tree-shakeable ESM-only builds, and a new Helpers package.

Release Note · Swift Toolkit Version 3.11.0

We are happy to announce the release of the Readium Swift Toolkit 3.11.0. This update gives you more control over audio session handling, makes LCP more robust across app reinstalls, and fixes several Navigator issues.

Readium Dev Day 2026 · A deep dive into Readium projects

On June 10th, in the continuity of the 2026 Digital Publishing Summit, we invited members of our community to join us in Prague, Czechia to discuss our projects. Let's take a look back at what we've learned at the Readium Dev Day!

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.