From Optflux
If you’d rather do without the problem of downloading a particular youtube downloader to download your chosen YouTube video, you could readily online tool. Nevertheless, there are a number of web-based download platforms for YouTube, GetanyVideo is our current favorite. It’s neat and fast and won’t have you clicking through pages which spawn popups or any other intrusive ads.
1: Find the YouTube video you would like to download and duplicate its URL through the address bar near the top of your browser window.
Step 2: See a GetanyVideo homepage.
Step 3: Paste it into the bar that reads “Enter the video's link...”
Step 4: Select your chosen video format and click the respective blue “Download” button on the right-hand side.