JDownloader is a download manager, written in Java, which allows automatic download of groups of files from one-click hosting sites. JDownloader supports the use of premium accounts. Some parts, but not all, of JDownloader are open-source. In December 2009 the program’s website was in the top 1000 visited websites of Spain. The German online magazine, Chip.de designated it “newcomer of the year” in 2009, after it ranked among the top 50 most downloaded applications, with over half a million downloads in a year.
Mid-2012 there were complaints that JDownloader’s installer added adware without the user’s consent. The JDownloader installation contains adware according to several sources, including the developer’s own forums. There were further complaints mid-2014.
In June 2013, JDownloader’s ability to download copyrighted and protected RTMPE streams was considered illegal by a German court. This feature was never provided in an official build, but was supported by a few nightly builds.
In 2011, JDownloader was superseded by its successor, JDownloader 2. While support for the original JDownloader still exists on forums, the official site only lists JDownloader 2.