Cool Reader

Cool Reader is a lightweight eBook viewer that renders documents using an XML/CSS layout engine. It runs on desktop operating systems such as macOS, Windows, Linux and BSD, as well as on Android and certain e‑ink devices, providing a consistent reading experience across hardware. The application supports a wide range of formats, including FB2, TXT, RTF, DOC, TCR, HTML, EPUB, CHM, PDB and MOBI, and allows users to apply custom stylesheets to adjust typography and layout for better readability.

The software is targeted at individuals who need a fast, portable solution for reading digital books on various platforms, especially those who prefer fine‑grained control over rendering through CSS. Its small footprint makes it suitable for handheld devices with limited resources, while the cross‑platform design ensures that a single workflow can be used on both desktop and mobile environments.

Cool Reader is released under the GPLv2 license and is maintained as an open‑source project. It offers extensive configuration options for rendering and navigation, and its source code is available for modification or integration into other applications that require XML/CSS based eBook handling.