4K Downloader allows you to download only audio stream from YouTube, without downloading the entire video file. 4K Downloader supports simultaneous downloads that allows you to download multiple videos at a time. It also allows you to pause, resume, and cancel downloads at anytime. 4K Downloader can automatically convert downloaded videos to the format that you specify. It supports MP4, FLV, WMV, MOV, ASF, AVI, M4V, MKV, MPG, OGV, TS, VOB, WEBM, and many other formats. 4K Downloader automatically converts and optimizes downloaded videos for your mobile/desktop device, so you can watch it smoothly on your iPhone, iPad, Android phone, Android tablet, Xbox, PSP, PS4, Samsung Galaxy, or other device. 4K Downloader allows you to extract audio stream from video, and save it as MP3, WAV, WMA, AC3, AAC, OGG, M4A, FLAC, or any other format. Optionally, 4K Downloader can automatically add downloaded videos/music to your iTunes library, so you can easily synchronize your videos and music to your iPhone, iPad, etc. 4K Downloader integrates with Internet Explorer and Firefox, so you can download and convert any video with just one click. You may also directly drag and drop video link from your browser to the Drop Box of 4K Downloader to start download, you don't even need to copy and paste video URL manually.