Of course, viewing is one thing; editing is another process. If you want to write something in an existing PDF file, and then save your changes, you have software such as, PDF Architect, iSkysoft ...

To write on a PDF on Android, open the PDF file in the Adobe Acrobat Reader: Edit PDF app, and tap on the Text icon. Select where you want to input new text and type away.

Samsung has just filed for a patent that will change the course of the PDF format forever. Write on PDF is new functionality that will allow a user to write, edit and save a PDF file. Well, its ...