It has a secondary characteristic: it’s difficult to edit a PDF very extensively. The PDF format is designed to display a document accurately regardless of what device is used to view it. Here are four ways to do that, including a couple that you don’t know about. Sometimes it’s necessary or helpful to edit the contents of a PDF file in Microsoft Word. Offices might be creating more PDFs than Word documents and Excel spreadsheets. PDFs are used for everything, from scanning the mail to exchanging contracts during negotiations. Offices have settled on PDF as the universal file format.