hi, not sure if this has been posted before, I have a general question and have received a few mixed answers already so I was hoping some of you guys could help me.

I download my desired videos from Youtube quick and easy, save to HD, MP4, M4A, MPEG or FLV formats, simply by pasting the URL into a link grabber here: www.etyn.com/tools/youtube-downloader BUT have no idea about the safeness of online tools, had to mention the site looks good but it connects to another server to download the file, is it secure? if it's not how can it harm my PC?