In February 2023, a security vulnerability affecting versions 4.5.0 and 4.5.1 was discovered in the Web UI running on Windows systems. Īlong with the 4.0.0 release a new logo for the project was unveiled. It is currently developed by contributors worldwide and is funded through donations, led by Sledgehammer999 from Greece, who became project maintainer in June 2013. QBittorrent was originally developed in March 2006 by Christophe Dumez, from the University of Technology of Belfort-Montbéliard (UTBM). It relies on Boost, Qt 6 toolkit and the libtorrent-rasterbar library (for the torrent back-end), with an optional search engine written in Python. QBittorrent is a cross-platform free and open-source BitTorrent client written in native C++.

≥ 10% translated: Croatian, Esperanto, Arabic, Armenian, English (Australia), English (United Kingdom), Georgian, Hindi (India), Icelandic, Latgalian, Uzbek (Latin), Vietnamese ≥ 50% translated: Belarusian, Bulgarian, Chinese, Chinese (Hong Kong), Finnish, French, Greek, Hungarian, Italian, Latvian (Latvia), Malay (Malaysia), Norwegian Bokmål, Occitan (post 1500), Portuguese, Romanian, Slovak, Slovenian, Spanish, Swedish ≥ 99% translated: Basque, Catalan, Chinese (Taiwan), Czech, Danish, Dutch, Galician, German, Hebrew, Indonesian, Japanese, Korean, Lithuanian, Polish, Portuguese (Brazil), Russian, Turkish, Ukrainian

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