In June 2013, JDownloader's ability to download copyrighted and protected RTMPE streams was considered illegal by a German court.

The program can be configured to unpack split RAR archives automatically after all parts have been downloaded.

JDownloader supports "waiting time" and CAPTCHA recognition on many file hosting sites, enabling batch downloads without user input.

As of 2014[update] JDownloader uses a continuous deployment system where modifications to the program code (e.g. adapting a plugin to changes in a download site's HTTP API) can be released within minutes.

[11] For the beta version, frequently occurring errors in plugins are detected via automated error reports (leaving out some privacy-sensitive data including the user's IP address and the name of the downloaded file).