When we surf the Internet, we are easily attracted by some interesting online videos. Since many websites like Facebook, Twitter, Instagram or YouTube do not offer users video download links, generally, you might add the video link to saved items or repost the video to your own page so as to watch it latter. However, it’s hard to avoid the video deletion from the blogger so that you will miss the video forever. In this case, you might be curious about the method to download online videos from any sites on Windows/Mac, iOS or Android devices. Here we recommend you an URL video downloader online, called VidPaw Online Video Downloader.
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. 

However, even free, you can grab 4K video from YouTube with no problem. A 575.4MB file took over 10.5 minutes—no surprise with the speed restriction, but still agonizingly painful. There's an option to convert the file to MKV, AVI, or WMV as you download it. If you want a playlist, you can do them in a batch, but in my test TubeGet would only allow a max of 1080p HD even on the 8K video playlist.
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.
The web browser Safari can be served as a Safari YouTube downloader, which offers an easy way to download any HD 720P/1080P videos on YouTube as well as other web. And for a successful YouTube videos download on Mac OS X, please make sure you have the latest version of Safari. Follow the detailed guides and learn how to download YouTube videos on Mac using Safari.
On iPhones and iPads, you'd think there would be no such restriction since Apple and Google aren't exactly the best of pals. But on the few apps I tried in the first edition of this story, not only wouldn't they download from YouTube, they're not even available anymore. One of those apps said in its description, "downloading from YouTube is prohibited due to its Terms of Service." Apple is ensuring that app makers play by the rules—even Google's rules. All the better to get Google to block someone who eventually does something illegal with iTunes downloads.
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.
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