KOReader is an ebook reader optimized for e-ink screens. It can open many formats and provides advanced text adjustments.

See below for a selection of its many features:

- Supports both fixed page formats (PDF, DjVu, CBT, CBZ) and reflowable e-book formats (EPUB, FB2, Mobi, DOC, CHM, TXT, HTML). Scanned PDF/DjVu documents can be reflowed. Special flow directions for reading double column PDFs and manga.
- Multi-lingual user interface optimized for e-ink screens. Highly customizable reader view with complete typesetting options. Multi-lingual hyphenation dictionaries are bundled in.
- Non-Latin script support for books, including the Hebrew, Arabic, Persian, Russian, Chinese, Japanese and Korean languages.
- Fonctionnalités Plan du livre et Navigateur de pages uniques pour naviguer dans votre livre.
- Special multi-page highlight mode with many local and online export options.
- Can synchronize your reading progress across all your KOReader running devices.
- Integrated with Calibre, Wallabag, Wikipedia, Google Translate and other content providers.