From Optflux
If you’d rather do without the hassle of downloading a certain download online videos to download your selected YouTube video, you can use an online tool. Nevertheless, there are several web-based download platforms for YouTube, GetanyVideo is our current favorite. It’s and also fast and won’t have you ever clicking through pages which spawn popups and other intrusive ads.
Step one: Find the YouTube video you would like to download and duplicate its URL in the address bar at the top of your browser window.
Step 2: Navigate to the GetanyVideo website.
Step 3: Paste it in the bar that reads “Enter the video's link...”
Step 4: Select your chosen video format and click on the respective blue “Download” button for the right-hand side.