KeepVid YouTube Downloader is our desktop service, supports Windows and Mac systems, and can quickly download multiple audio and video files in batches. KeepVid supports HD / 4K MP4, 320kbps MP3 format, allowing you to enjoy the highest quality audio and video. Why not download it for free? Xilisoft YouTube HD Video Downloader for Mac can help you fast download YouTube High Definition videos in resolution of 720p or 1080p and standard definition videos.