Updated: YouTube no longer supports 4K video player in Safari according to the feedback from Reddit users. This is because of the VP9 video codec problem that safari doesn't support. So Mac users won't access to 4K video on YouTube in native 2160p resolution until Apple updates Safari to support VP9 codec. Or they can turn to another 4k video player like 5KPlayer or YouTube downloader for Mac to capture the 4K videos for viewing offline.

Step 1:   Free download YouTube video downloader on Mac iMac Pro, Macbook Air/Pro or Mac Mini and install it, copy the URL of the video page. find a video you'd like to save offline, then paste the URL and click "analyze" to load the YouTube video details. Or click "paste & analyze" button to automatically detect the YouTube video opened in browse.

DistillVideo supports to run in any browser accross any platform, regardless of whether you are using Windows, Mac or Linux, Android, iPhone. Provide audios/videos in full file formats including MP4, AVI, MP3, WEBM, FLV, 3GP, M4A, etc. It also supports HD videos of 1080P, 2K, 4K and 8K. It can convert any online video to MP3 for free (free MP3 converter). Subtitles can be extracted and downloaded as well. No need to install any annoying softwares or apps that may infect your computer or android phone. It is the best and free downlowder to download any video from any site using url online.
There are many online YouTube video download tools available in the market. It saves you from downloading any software on your macOS. The most well-known web services are Keepvid, Zamzar, Clipconverter, both of which work well with YouTube, MySpace, Dailymotion, Vimeo and other mainstream online video hosting sites. With them, you can easily download 1080P HD videos, 4K/8K UHD videos from YouTube to Mac.
Step 3: Choose your targeted video format from the top right corner. There are a lot of formats available. Including MP4, AVI, MKV, and MOV. After this, click on the conversion icon on the right of the chosen file. If you have to convert all the videos in the chosen list, simply choose the “Convert All” option on the bottom right of the main window.
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