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.
Totally free, 5KPlayer from DearMob is a media-playing utility that is a lot more than a downloader—but it's got a heck of a downloader integrated. Promising no viruses, ads, or plug-in requirements is a good start. It is, sadly, one of the few I tested that asks for a registration of your name and email—you have to do that to get the full download function across 300+ sites. You may still use it if you don't register; I didn't and was able to download 4K vids from YouTube.
DistillVideo is the best free online video & music downloading platform where you can download any video and audio from YouTube, Facebook, Instagram, Twitter, Dailymotion, Vimeo and 5000 more websites on your desktop or mobile device very fast without any restriction. Supporting full formats including MP4, WEBM, AVI, FLV, MP3, M4A, 8K, 6K, 4K, 2K, 1080P, 720P...
The Chrome Web Store—where you get Chrome browser extensions—is controlled by YouTube's owner Alphabet/Google. Even an extension ostensibly for this purpose—like the obviously named Video Downloader professional above—states right up front in its description, "The download of YouTube videos to hard drive is locked because of restrictions of the Chrome Store." In general with Chrome extensions, the download of any RTMP protocol video (protected videos) or streaming video isn't possible.
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.

You’ll find fresh and engaging popular videos of a very good quality that are easily downloadable with Catch.Tube from many websites throughout the network. The downloading process is so easy and can be performed in a few clicks. To make it even easier to use the website, we created an extension for the browser, which allows you to go to page download when viewing the video. Video downloaders can be found in Chrome Web Store and it is totally free. Just add it to your browser, and you will be able to save your favorite videos from popular services.
5K Player also features DLNA server playback so videos you grab can be watched on any devices on your home supporting DLNA network; it supports AirPlay for quick playback to supported devices. Pick a video in the library and you can do a quick conversion to MP4, MP3, or even ACC (an audio format preferred by iOS devices). The player didn't like playing back the overly large 4K file though and experienced buffering issues—VLC didn't have any problem with the same file. Ultimately, there's a lot to like about 5K Player, from the price to the features, especially if you look at them as extras on a downloader. But the interface and playback issues may have you looking elsewhere.
The DVDVideoSoft system gives you free downloads in just about any style you might need. It’s an easier YouTube video downloader that consists of only three different steps. The system is older than some because it’s more than ten years old and it provides some of the best quality you could want. It’s available to be used on both PC and Mac computers, which gives you the level of versatility and flexibility that you’re looking for before you even get started. Plus, you can get a range of different options or different formatting features to the videos that you want to download. 
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