I really do not believe that the free PDF services online have so many professional functions as the paid ones. As for me, I am also testing about the related PDF toolkits these days, and I want to look for a fine professional 3rd party PDF toolkit whose way of processing is simple and fast to help me with the related PDF manipulating work. It will be better if it is totally manual and can be customized by users according to our own favors. Do you have any ideas about it? Or any good suggestion? Thanks in advance.