From Optflux
If you’d rather do without the headache of downloading a selected download online videos to download your preferred YouTube video, you can use an online tool. Nevertheless, there are a lot of web-based download platforms for YouTube, GetanyVideo is our current favorite. It’s neat and fast and won’t maybe you have clicking through pages which spawn popups and other intrusive ads.
Step 1: Find the YouTube video you want to download and copy its URL from the address bar towards the top of your browser window.
Step 2: Go to the GetanyVideo home page.
Step 3: Paste it into the bar that reads “Enter the video's link...”
Step 4: Select your selected video format and click on the respective blue “Download” button on the right-hand side.