You just need to copy your preferred playing URL, or right click on the video to select "Copy video URL", then paste the URL into the search box of Distill Video (http://distillvideo.com) and press “Start” button. After waiting 2-3 seconds, the video section showed, choose your preferred format and right click the "Download" button, then click "Save link as..." to download the video or audio into your computer or mobile phone. It supports HD: 1080p, 2k, 4k and 8k. If you are using browsers of the smart phone or tablet, just Touch and hold the "Download" button, then click "Download link" to save the file to your device. 

Do you prefer to avoid installing software? Video download helper sites do the download work for you, providing conversion and then a download link—you don't have to install anything on your PC. It can take a lot longer, depending on the size and quality of the video you want—a typical two-minute movie trailer in 1080p can be around 30MB—but you can't beat the convenience.
There are several methods for downloading YouTube videos. The instructions above discuss two popular ways to complete the task, but other options exist. There are numerous software suites available to download these videos. If you prefer this method, you can easily find choices by searching the internet for “YouTube downloading software.” The directions you find here discuss the use of websites that are specifically created to download YouTube videos.

When you copy a YouTube URL (even for a playlist), click in the WinX software to launch. You start with the "analyzer," which checks all the options. This tool also tried to default to the 1,920-by-1,080 version in MP4; I picked the 4K version (3,840 by 2,160 pixels) in WebM format, a subset of the MKV format—you can rename a .webm file to a .mkv and it'll work fine. In settings there are options to default to WebM at highest res. You can set up a number of videos to back up before you even click the download button. The 4K 575.4MB file took 1 minute and 39 seconds to download, more than double that of 4K Video Downloader.
When downloading, the program does try to hide some things. Paste in the URL for a YouTube video and the analysis engine runs and shows only a few download options. Click the Gear icon, then the Show All button and you'll see more—including ability to get a 4K 3,840-by-2,160 file in WebM format. The 577MB WebM test download took about 6.75 minutes. Grabbing playlists was possible, but you must adjust download settings one video at a time. The confusing interface makes it hard to go back to the other videos in the playlist.
Do you prefer to avoid installing software? Video download helper sites do the download work for you, providing conversion and then a download link—you don't have to install anything on your PC. It can take a lot longer, depending on the size and quality of the video you want—a typical two-minute movie trailer in 1080p can be around 30MB—but you can't beat the convenience.
With the WinX YouTube Channel Downloader, you’ll need to download their software before you do anything else. Now, this system does have a paid version, or you can check out the free trial first. You get to choose the URL that you want to download and it can auto-detect all of the information about that video, including the format and size and even the resolution. But you still get to make the final determination. From there, you just click the button to download, and you’ll be ready to go.
YouTube allows you to watch, upload and share various videos including HD/4K content with users. It's said 500 hours of video are uploaded to the site per minute nowadays. However, YouTube only allows you to do such things when you connect to internet and YouTube doesn't allow 4K streaming in Safari. What could you do if you wanna save your HD videos on Mac or what if you are in a place, e.g. on a plane, where you cannot access to network? Hold on, we just gather up the top lists of free YouTube downloader for Mac software, browser extensions and online services targeted for Mac users to deal with downloads of YouTube videos on macOS freely.
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.

VidPaw is a versatile and totally free URL video downloader, which has the ability to download online videos from over 1000 sites with high quality, for example, download videos from YouTube, Twitter, Vimeo, and Facebook private videos, download Instagram videos and so forth. Moreover, it supports Windows, Mac, iPhone, iPad, Android Phone/Tablets. What’s more, there is no need to download any software or app on your devices. And you can simply reach the result with VidPaw.com. To download online videos with VidPaw, you just need simple steps.

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.
If you’re in a place where you don’t really have internet, but you don’t want to use up the data that’s still available on your mobile device you can still get access to the information that you want. Downloading and watching videos can eat away a lot of data from your phone plan or it could take up a whole lot of bandwidth that you really don’t want to be using. Instead, you could have the video already downloaded and ready to play without you having to continue using up the data.
If you want to download as videos itself, you can use other free tools like Free Youtube Download to download all videos with a single click. Please be careful while installing this tool as it optionally installs a browser toolbar and modifies search preferences. So please make sure you read and uncheck the optional checkboxes while installing to avoid surprises in your browser. 
Important news: Recently, YouTube has rolled out a series of changes to retard the download from the video site. As a result, many downloader tools such as 4K video downloader, Clipgrab, Realplayer and more encountered errors, such as "Error. Unknown site", "Can't parse this link. Please send it to our support and we'll check it" and more, but MacX YouTube Downloader successfully parses the YT link and makes downloading as easy as possible. 
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