Step 1: Free download YouTube video downloader on Mac iMac Pro, Macbook Air/Pro or Mac Mini and install it, copy the URL of the video page. find a video you'd like to save offline, then paste the URL and click "analyze" to load the YouTube video details. Or click "paste & analyze" button to automatically detect the YouTube video opened in browse.
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".
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.
YouTubeByClick captures video from over 40 sites. Before you even do the first download, you can use the "dials" on the interface to set up a preferred download format (MP4 video or MP3 audio) and a default download quality as high as 8K, even on the free version. Downloading a 580MB MKV file in 4K only took 55 seconds—not bad at all, but that was with the premium version's unlimited speed. The free edition took a lot longer with the 2MB speed limit. You also need the premium version to download playlists and channels, do conversions, avoid ads, and get closed captions.
There are workarounds. One is using a free iOS file manager app like Documents by Readdle. Use the Safari browser to visit a YouTube video, and use the Share option to find Copy Link. Then go back to Documents, and use the built-in browser in the app to surf to a video download helper site like SaveFrom.net. Paste the link into the form (hold your finger down on it until you get "Paste" menu to pop up). The site will give you the links to download, and you can save the file to Documents. Hold down and drag the file up, until you're back on the main screen, then drag it to the Photos folder. You'll need to give Documents permission to access Photos the first time. You can then access the video like you would any video taken on the phone or tablet—in the Photos app.