Not sure if Virusfree
I needed to download some youtube videos for my personal use, and this converter even tho it didnt have the best quality after, the videos were perfect.
But Malwere/Virus wise, I have no idea, since I am running uBlock and Malwerebytes on Firefox and I have additional the free Malwerebytes and the free Avira softwares installed. Those Programms havent noticed anything malicious.

