Crocodoc is a free web service that will allow you to edit and share PDF documents online.It is very simple and easy to use anybody. It doesn’t require any download. CrocoDoc is an HTML5-based web service. Crocodoc supports the following file formats pdf, doc, docx, ppt, pptx, png, and jpg.
To edit files simply upload your files into crocodoc website after the upload you can adding comments, drawing on the document, adding typed text, highlighting it, annotating text etc. After finished all your work you can share files to other via URL. You can also get embeddable code.