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Software · Office & notes

KOReader

KOReader is an e-book reader, available on Linux and Android.

  • Completely free
  • Linux and Android
  • Open source

Overview

KOReader is an e-book reader, available on Linux and Android.

File formats mentioned: PDF, EPUB, MOBI, CBZ, DJVU, FB2 and HTML.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Ebook reader” — Flathub, 10 November 2026
  • “KOReader is a document viewer primarily aimed at e-ink readers..” — GitHub, 10 November 2026

At a glance

KOReader is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (AGPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No advertising
  • Commercial use allowed

About

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. Unique Book Map and Page Browser features to navigate your book. 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.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from F-Droid (credit card, source code, licence, free status, platforms, ads, commercial use, version) —
  • Last technical check: 6 November 2026
  • Description from Flathub — AppStream (Flathub)

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