Search for the 'tampermonkey' extension program in chome store, click to enter the add program interface. After adding, return to the current page to install the conversion function, and then when you visit YouTube.com, there will be more download function buttons at the bottom right of the video to facilitate conversion and download.
After installation, there will be more download function buttons under the video. You can download the video directly when watching YouTube video without going to other places for conversion and download, which is convenient and fast and saves you time looking for tools.