I keep copies of all my uploaded videos to YouTube on an external hard drive but most people don't do this. You run the risk of losing all your hard work should YouTube terminate your account. Google Drive makes it easy to backup all the current videos on your YouTube channel. It also makes video management very simple. You can preview your videos within Google Drive or download them at any time.
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.
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.
You just need to copy page URL, or right click on the video to select "Copy video address", then paste the URL into the search box of Distill Video (http://distillvideo.com) and press “Start” button. After waiting almost 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 phone. So you also can call it "tweet video downloader".
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 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.
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.
You can use DistillVideo to download youtube videos for free, download from youtube without software. You can download and save video, audio/music, captions to computer, iphone, iPad or andriod device (smartphone/tablet) very easily. DistillVideo is the best youtube video downloader using url online. Supports to download youtube videos MP4, WEBM, 3GP, AVI, MP3, M4A, 8K, 6K, 4K, 2K, 1080P, 720P, 480P, 360P, 240P, 144P, etc.
If you're willing to do more about the offline YouTube videos, you can try the its advanced version - MacX Video Converter Pro. Comparing with MacX YouTube Downloader, It not only allows you to download YouTube SD/HD/4K videos on Mac, but also convert them to all general-purpose formats, and common devices profiles, edit the downloaded YouTube videos, record screen videos from both desktop and iPhone, or capture videos with webcam. Besides, if you have DVD sources, you can also take advantages of this program to rip DVD to any formats and devices, or make a backup of your DVD movies without any quality loss.
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.
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.
Eric has been writing about tech for over 27 years. He was on the founding staff of Windows Sources, FamilyPC, and Access Internet Magazine (all defunct, and it's not his fault). He's the author of two novels, BETA TEST ("an unusually lighthearted apocalyptic tale"--Publishers' Weekly) and KALI: THE GHOSTING OF SEPULCHER BAY. He works from his home office in Ithaca, New York. 
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. 

If you mis-tag your videos for the wrong set of audience, the FTC could charge you with compliance issues, and later, even takedown your channel. Other disciplinary actions include the implementation of fines, which could go up to $42,000 for each violation. Even though the help-centre of YouTube claims that they will look into the financial status of the content creator before the fines are decided, it still could add up to a considerable amount. Many YouTube animators are currently in a dilemma, as their work is not directed at children, but cannot be tagged as “for adults” either.
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