From Optflux
If you’d rather do without the headache of downloading a particular download online videos to download your chosen YouTube video, it's possible to make use of an online tool. Although there are lots 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: Discover the YouTube video you need to download and copy its URL from your address bar at the top of your browser window.
Step 2: Visit the GetanyVideo home page.
Step 3: Paste it in the bar that reads “Enter the video's link...”
Step 4: Select your preferred video format and click the respective blue “Download” button on the right-hand side.