YoutubeRemixer 【Online Video Editing】

Sometimes, the videos you upload to YouTube are not edited, or you can't find an editing tool at hand. In that case, you can try YouTube's own Remix tool.

The instructions on the side say that it uses Adobe Premiere technology, and it is quite convenient to operate. Personally, I think it is very similar to Microsoft's Movie Maker. You can drag the videos you want to edit together down below, and there are also a large number of borders, dynamic materials, and professional transition effects to choose from.