Never been able to find a video converter that can handle as many web sites as this one.
True however that since the new versions (some 3 or 4 years ago) videos might be marked by a stamp in the top left corner when choosing a good quality (720p and above) video. Sad because sometimes it corrupts important details on the image.
However this is the best Vdnwloader I could find on a browser (no such thing under Brave or Opera for example).
**** (4 stars) for me.