Impossible to cancel the free trial
Sadly, as others have reported, I too tried it for the seven day trial. The only way to cancel was via the support@ email address - I received no reply and $35.40 has been charged to my account. I tried it to compress a PDF and that worked fine; so, if you will use the facilities of the site it may be a fair investment but take great care or you may be paying for it for evermore.