It can convert them to other video formats, such as AVI, FLV, and MKV, extract the audio stream and save it to MP3, AAC, FLAC, and others, as well as prepare items for Nokia, BlackBerry, iPhone, and other devices thanks to another application made by the same developer.
The tool is wrapped in a clean and intuitive GUI, where you can add URLs with video clips in just a matter of clicks. You can import as many links as you want. It is important to mention that MP4 Downloader supports a Clipboard live-monitoring tool to ease the process, alongside a floating dropbox that stays on top of other frames.
As far as downloading and conversion settings go, you can choose the quality (from standard and low quality to high quality or high definition, if available) and establish a saving directory and make the tool automatically add downloaded audio and video clips to iTunes.