KOReader is a document viewer primarily aimed at e-ink readers.

Main features

- Portable: Runs on embedded devices (Cervantes, Kindle, Kobo, PocketBook, reMarkable), Android, and Linux computers. Developers can run a KOReader emulator on Linux and macOS.

- Multi-format documents: Supports fixed-page formats (PDF, DjVu, CBT, CBZ) and reflowable e-book formats (EPUB, FB2, Mobipocket, DOC, RTF, HTML, CHM, TXT). Scanned PDF/DjVu documents can also be reflowed using the built-in K2pdfopt library.