Kiwix is a free and open-source offline web browser created by Emmanuel Engelhart and Renaud Gaudin in 2007.

Available in more than 100 languages, Kiwix has been included in several high-profile projects, from smuggling operations in North Korea[10] to Google Impact Challenge's recipient Bibliothèques Sans Frontières.

[9] In 2012, Kiwix received a grant from Wikimedia France to build a kiwix-plug, which was deployed to universities in eleven countries known as the Afripedia Project.

[a][14][16] All content files are indexed and compressed in ZIM format, which makes them smaller, but leaves them easy to search and selectively decompress.

Kiwix offers full text search, tabbed navigation, and the option to export articles to PDF and HTML.

[16] The project was unable to produce up-to-date complete versions of English Wikipedia after October 2018 but started making releases again in July 2020.

[21] Besides Wikipedia, content from the Wikimedia Foundation such as Wikisource, Wikiquote, Wikivoyage, Wikibooks, and Wikiversity are also available for offline viewing in various different languages.

From 2014 to 2020, it was absent, due to XULRunner, a program on which Kiwix depended, being deprecated by Mozilla and removed from the package databases.

[3] It is also available as an installable HTML5 app (Kiwix JS) in the form of browser extensions for Firefox and Chromium (Chrome, Edge) and as a Progressive Web Application (PWA),[59] all of which work offline.