You can download karaoke videos from YouTube by using an online video downloading tool such as those found on SaveFrom.net, ClipConverter.cc, KeepVid.com or OnlineVideoConverter.com, as of 2015. Enter the URL of the video you wish to download into the online tool, and choose the conversion file type to download it.
The process for downloading a karaoke video or any other type of video from YouTube actually involves the use of a tool to create a copy of the video file, rather than actually obtaining the original file from YouTube. Most online conversion tools ask for the URL of the video and then prompt you to choose from a selection of options relating to the length and quality of the video. The downloading process typically consists of the site recording the video and creating a new file for you to download. It may take anywhere from a few seconds to a few minutes to convert and download the video, depending on the available Internet speed.
Each site offers different tools and features with this process. For example, ClipConverter.cc allows you to enter a specific start and end time for the video. OnlineVideoConverter.com also offers this feature, as well as options to increase or decrease the audio or set a different audio bit rate and frequency. Some of these sites also offer a browser add-on that allows you to download the video while at YouTube.com rather than visiting the video converter's site.