Kiwix review: how the free, open-source offline Wikipedia reader works, its ZIM file format, supported platforms, and alternatives like XOWA and WikiTaxi.
Kiwix is a free, open-source offline content reader founded in 2007 by Emmanuel Engelhart and Renaud Gaudin in Switzerland, with early support from Wikimedia CH. It was created to distribute Wikipedia and other reference content to people without reliable internet access, such as those on ships, in prisons, or in remote or disaster-affected regions.
The organization operates as a not-for-profit funded through donations and grants, does not display ads, and does not collect user data. Its technical foundation is the ZIM file format, a highly compressed, searchable archive format built specifically for offline web content distribution.
The Kiwix Reader is available on Windows, macOS, Linux, Android and iOS, plus a browser extension and the Kiwix Serve tool for hosting ZIM files over a local network so multiple nearby devices can browse without internet access.
Through its library and catalog, users can download Wikipedia in dozens of languages, Wikimedia sister projects like Wikisource and Wikivoyage, and third-party content such as Project Gutenberg books, Stack Exchange archives, TED talks and Khan Academy modules. Companion hardware like the Kiwix Hotspot broadcasts offline content locally via Wi-Fi.
Kiwix is entirely free, open source, and has no subscription, paywall or premium tier. All reader apps, the ZIM content catalog, and companion tools are free to download and use.
As a donation-funded nonprofit, Kiwix accepts voluntary contributions and grants (including from organizations such as the Wikimedia Foundation) to sustain development, but no payment is required to access or use any part of the platform.
Yes, Kiwix is completely free, open source, and funded through donations and grants, with no subscription or premium tier.
A ZIM file is a highly compressed, indexed archive format developed by Kiwix for storing and fully searching offline web content such as Wikipedia.
Yes, once a ZIM content archive is downloaded, Kiwix Reader works entirely offline with full search functionality.
Kiwix Reader is available for Windows, macOS, Linux, Android and iOS, along with a browser extension.
Kiwix was founded in 2007 by Emmanuel Engelhart and Renaud Gaudin in Switzerland, with early support from Wikimedia CH.
Kiwix's catalog includes Wikimedia sister projects, Project Gutenberg books, Stack Exchange archives, TED talks and Khan Academy modules.