MacX YouTube Downloader is the best free online video downloader for Mac OS that can download music and videos from over 300 online video sites. It helps you to not only download videos from YouTube for free but also download videos from Facebook, Dailymotion, Vimeo, Vevo, Metacafe and more within just a few clicks. As a powerful YouTube video downloader, this video downloader program supports downloading YouTube videos in whatever format or resolution, such as MP4, WebM, FLV, even 4K HD video. Integrated with easy-to-use interface and advanced technology, MacX YouTube Downloader makes it the ultimate choice for you to free download popular songs, hot movie trailers and anime online with fast speed and zero quality loss. It is 100% free and does not contain any malware, spyware or adware. MacX YouTube Downloader 4.0.9 update improves stability and also adds compatibility with Mac OS Sierra. Key features: 1. Free download music and videos from FaceBook, YouTube, Vimeo, Vevo, Dailymotion and other 300+ online video sites. 2. Download all YouTube videos (MP4, FLV, WebM, even HD videos) to iPhone iPad Android compatible formats for offline playback. 3. Built-in video player enables you to watch videos immediately during the download process. 4. Download several videos all at one time due to the embedded multi-threading and batch downloading technology. 5. Automatically detect the YouTube video opened in browse, with no need of copying and pasting the URL manually. 6. Automatically add output MP4 videos to iTunes library for transferring to iPhone, iPad, iPod or other further use. 7. Extract image from YouTube movie to customize personal picture album.