The same as you do to download any other videos. You just need to choose the 1080p or 4k format in the video result section, sometimes it is in the "video only" section that without sound, then you have to download the audio file (M4A) in the same result section, then you can load the video file and audio files together on your computer using the video playing software, such as VLC. You also can combine the video and audio files by using ffmpeg. Some youtube video does not have HD format originally, in such case, you definitely can not download any HD format video.
Digiarty's multi-lingual WinX claims to allow downloads from 300+ sites—including adult sites. Perhaps the biggest selling point of all is the claim that "There is no malware, adware, spyware or virus. 100% clean." The latest version has a much improved interface as well. There are ads, though—on install, I was asked to upgrade to its $29.90 product for Windows and macOS called VideoProc, which does everything that WinX does, but for 1,000+ sites, plus offers some editing for high-end 4K/UHD video.
As one of the best YouTube video downloaders on the market, Jihosoft 4K Video Downloader supports downloading videos from almost all video streaming sites (such as YouTube, Facebook, Twitter, Instagram, Vimeo, Dailymotion, etc.). What sets it apart from online websites is that it allows you to download entire YouTube channels & playlists and save them in HD, 2K, or even 4K quality. In addition, it has a one-click download mode that can apply your settings or preferences to all downloads, which will greatly save your time and energy.
Step 1. Click the button below to download the YouTube Channel Downloader and follow the on-screen prompts to install it on your computer. After the installation process, run the program. This will be followed by a pop-up window that asks you to enter the registration code. If you have one, click on the “Register” option and enter your code along with your email. If you don’t have a code, you can either click on “Buy Now” to get a 20-digit registration code or close this window to choose the free trial option automatically.

This is a Chrome extension that actually works from the Web Store—because it doesn't let you download YouTube videos. It time marks snippets you can share (only from YouTube). First create an account and log in. The extensions icon turns green on a YouTube page—click it to create the times you want, and they are then saved and easily shared; the viewer goes back to YouTube and sees what you specify. It's not really close to saving a video for your offline use, but could be useful in certain circumstances.
Digiarty's multi-lingual WinX claims to allow downloads from 300+ sites—including adult sites. Perhaps the biggest selling point of all is the claim that "There is no malware, adware, spyware or virus. 100% clean." The latest version has a much improved interface as well. There are ads, though—on install, I was asked to upgrade to its $29.90 product for Windows and macOS called VideoProc, which does everything that WinX does, but for 1,000+ sites, plus offers some editing for high-end 4K/UHD video.
MacX YouTube Downloader helps you out of the dilemma, letting you download YouTube videos (HD/4K) on Mac free, thus you can save and watch your favorite videos offline, even if you are thwarted by the lack of Wi-Fi, restrictive data plan or sudden video disappear from YouTube. The free YouTube video downloader for Mac has been highly awarded by big tech giants like CNET, receiving 3.5 stars. It stands out from the rest largely due to it's free, safe but powerful in downloading any kinds of online videos like 360 degree VR videos, 4K/8K UHD, 3D videos, HD videos, Blu ray movies, TV shows, music, etc in whateverformat (MP4, FLV, WebM, 3GP, etc.). Its user-friendly interface will guide you to grab videos from YouTube on Mac without consulting any tutorials or user guide, no matter you are an experienced user or a newbie.
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