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[](https://koreader.rocks)
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#### KOReader is a document viewer primarily aimed at e-ink readers.
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[![AGPL Licence][badge-license]](COPYING)
[![Latest release][badge-release]][link-gh-releases]
[![Gitter][badge-gitter]][link-gitter]
[![Mobileread][badge-mobileread]][link-forum]
[![Build Status][badge-circleci]][link-circleci]
[![Coverage Status][badge-coverage]][link-coverage]
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[![Weblate Status][badge-weblate]][link-weblate]
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[Download ](https://github.com/koreader/koreader/releases ) •
[Wiki ](https://github.com/koreader/koreader/wiki ) •
[Developer docs ](http://koreader.rocks/doc/ )
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## Main features
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* **portable**: runs on embedded devices (Cervantes, Kindle, Kobo, PocketBook), Android and Linux computers. Developers can run a KOReader emulator in Linux and MacOS.
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* **multi-format documents**: supports fixed page formats (PDF, DjVu, CBT, CBZ) and reflowable e-book formats (EPUB, FB2, Mobi, DOC, CHM, TXT). Scanned PDF/DjVu documents can also be reflowed with the built-in K2pdfopt library.
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* **full-featured reading**: multi-lingual user interface with a highly customizable reader view and many typesetting options. You can set arbitrary page margins, override line spacing and choose external fonts and styles. It has multi-lingual hyphenation dictionaries bundled into the application.
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* **integrated** with *calibre* (search metadata, receive ebooks wirelessly, browse library via OPDS), *Evernote* (export hightlights), *Wallabag* , *Wikipedia* , *Google Translate* and other content providers.
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* **optimized for e-ink devices**: custom UI without animation, with paginated menus, adjustable text contrast, and easy zoom to fit content or page in paged media.
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* **extensible**: via plugins
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* **and much more**: look up words with StarDict dictionaries / Wikipedia, add your own online OPDS catalogs and RSS feeds, share ebooks with other KOReader devices wirelessly, online over-the-air software updates, an FTP client, an SSH server, …
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Please check the [wiki][link-wiki] to discover more features and to help us document them.
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## Screenshots
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< a href = "https://github.com/koreader/koreader-artwork/raw/master/koreader-menu.png" > < img src = "https://github.com/koreader/koreader-artwork/raw/master/koreader-menu-thumbnail.png" alt = "" width = "200px" > < / a >
< a href = "https://github.com/koreader/koreader-artwork/raw/master/koreader-footnotes.png" > < img src = "https://github.com/koreader/koreader-artwork/raw/master/koreader-footnotes-thumbnail.png" alt = "" width = "200px" > < / a >
< a href = "https://github.com/koreader/koreader-artwork/raw/master/koreader-dictionary.png" > < img src = "https://github.com/koreader/koreader-artwork/raw/master/koreader-dictionary-thumbnail.png" alt = "" width = "200px" > < / a >
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## Installation
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Please follow the model specific steps for your device:
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[Android ](https://github.com/koreader/koreader/wiki/Installation-on-Android-devices ) •
[Cervantes ](https://github.com/koreader/koreader/wiki/Installation-on-BQ-devices ) •
[Kindle ](https://github.com/koreader/koreader/wiki/Installation-on-Kindle-devices ) •
[Kobo ](https://github.com/koreader/koreader/wiki/Installation-on-Kobo-devices ) •
[Linux ](https://github.com/koreader/koreader/wiki/Installation-on-desktop-linux ) •
[Pocketbook ](https://github.com/koreader/koreader/wiki/Installation-on-PocketBook-devices )
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## Development
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[Setting a build environment ](doc/Building.md ) •
[Collaborating with Git ](doc/Collaborating_with_Git.md ) •
[Building targets ](doc/Building_targets.md ) •
[Porting ](doc/Porting.md ) •
[Developer docs ](http://koreader.rocks/doc/ )
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## Support
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KOReader is developed and supported by volunteers all around the world. There are many ways you can help:
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- [fix bugs][link-issues-bugs] and [implement new features][link-issues-features]
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- [translate the program into your language][link-weblate] or improve an existing translation
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- document lesser-known features on the [wiki][link-wiki]
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- help others with your knowledge on the [forum][link-forum]
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Right now we only support [liberapay ](https://liberapay.com/KOReader ) donations, but you can also create a [bounty][link-bountysource] to motivate others to work on a specific bug or feature request.
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Also if you have and old Pocketbook device you don't want, we might find it useful to tinker a bit with that platform. Please contact us through the forum or GitHub.
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## Contributors
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[![Last commit][badge-last-commit]][link-gh-commits]
[![Commit activity][badge-commit-activity]][link-gh-insights]
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[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/0)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/1)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/2)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/3)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/4)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/5)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/6)
[](https://sourcerer.io/fame/Frenzie/koreader/koreader/links/7)
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[badge-bountysource]:https://img.shields.io/bountysource/team/koreader/activity?color=red
[badge-circleci]:https://circleci.com/gh/koreader/koreader.svg?style=shield
[badge-coverage]:https://codecov.io/gh/koreader/koreader/branch/master/graph/badge.svg
[badge-commit-activity]:https://img.shields.io/github/commit-activity/m/koreader/koreader
[badge-gitter]:https://img.shields.io/gitter/room/koreader/koreader?color=red
[badge-last-commit]:https://img.shields.io/github/last-commit/koreader/koreader?color=orange
[badge-license]:https://img.shields.io/github/license/koreader/koreader
[badge-release]:https://img.shields.io/github/release/koreader/koreader.svg
[badge-mobileread]:https://img.shields.io/badge/forum-on_mobileread-lightgrey
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[badge-weblate]:https://hosted.weblate.org/widgets/koreader/-/koreader/svg-badge.svg
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[link-bountysource]:https://www.bountysource.com/teams/koreader
[link-circleci]:https://circleci.com/gh/koreader/koreader
[link-coverage]:https://codecov.io/gh/koreader/koreader
[link-forum]:http://www.mobileread.com/forums/forumdisplay.php?f=276
[link-gh-commits]:https://github.com/koreader/koreader/commits/master
[link-gh-insights]:https://github.com/koreader/koreader/pulse
[link-gh-releases]:https://github.com/koreader/koreader/releases
[link-gitter]:https://gitter.im/koreader/koreader
[link-issues-bugs]:https://github.com/koreader/koreader/issues?q=is%3Aopen+is%3Aissue+label%3Abug
[link-issues-features]:https://github.com/koreader/koreader/issues?q=is%3Aopen+is%3Aissue+label%3Aenhancement
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[link-weblate]:https://hosted.weblate.org/engage/koreader/?utm_source=widget
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[link-wiki]:https://github.com/koreader/koreader/wiki
