Schoolwork, documents and many other PDF files become a problem when you need to edit them, so we will teach you how to edit PDFs for free on your cell phone or PC. In addition to the possibility of editing the PDF file, you will also have the possibility of signing documents, a function present in this editor. If you want to merge PDF files, you can check out another post to learn how to do it. If you still have doubts about how to use some features and how to edit PDF documents,