Recent content by Imitation

Is there a way to edit a PDF file that I am viewing on a website? I can only open it with quickoffice but I cannot edit or do anything to it.

I need an app where I can open .doc files and be able to edit them. Meaning. Type things on the file and highlight and erase things. I've been using dropbox to view Microsoft word documents but I can't do any editing to them. It's for my class. I need to be able to add or erase words and...