Video Downloader are Chrome extensions that can be used to download It has a built-in YouTube converter to convert video to MP3, MP4. It's also safe and legal using the right chrome extension. And yes, there's a way to download videos from YouTube (see option three). From there, it takes a few seconds to convert the video and a few more to download it as an MP4. Youtube Mp4 Downloader Chrome Extension. Step 1: To start with, you need to download and install the program to your computer. It's integrated a software.