It can be said that YouTube is currently one of the most potent video social networks. Users can view daily content updated hourly. Extremely diverse content comes from many different presentation styles, making it easy for viewers to feel extremely interesting. Sometimes they will spend the whole day just enjoying the videos on YouTube. Recently, it was designed to resemble a social network so users could “endless swipe” tell the content they care about. Besides, the videos that you are watching are missing and will be saved, and your data is read carefully. So it can be said that YouTube is like a friend when he knows all your interests and Habits of watching videos to suggest things that users can say are incredibly favorable. So when you come across videos that I feel it’s worth it for me, I have an idea to download it in my device for offline viewing. In fact, YouTube also has a built-in function for you to Download the videos you like freely, but really, the speed is very low and sometimes limited to some features. Therefore, an application to optimize YouTube videos that are optimized is essential.