Outrageously easy way to download videos from youtube

1. Go to the page with the desired video
2. In the address bar, replace Y (in the word youtube) with 3 and press Enter
( example : www.youtube.com/watch/?v=QVa_dK_PFWA#
www.3outube.com/watch/?v=QVa_dK_PFWA# )
3. Choose in which format to download, click and smile!

The service is not related to Google, it remains to figure out how safe a visit to this resource is.