Choose the desired options- quality, format, download patch, among others.In the space for entering the URL link on the platform, paste the copied URL link of the YouTube video you wish to download.If it is not an online tool, download the software for your operating system and install it. Some common steps to download videos using a YouTube download app are: In other cases, downloading videos from YouTube varies according to the YouTube video downloader platform and the operating system you are using. Simply clicking on it will start the download process. If you are not using any other tool, you can use the download option offered by YouTube with the video you are watching. Best YouTube Video Downloader Apps for PC & Mobile.