It may not perfectly suit PDF documents with many charts or graphs, but if they have simple text, you can use Word Online to edit them.

Learn how to use one of Word 2013's most asked-for features: how to open and edit a PDF file in Word.

How to Edit a Scanned Document in Word. If you have a printed copy of a Word document, but don't have the original document, you can scan the copy and edit it in Word. If the copy is properly ...

How to Edit Text in Office Word 2007. Microsoft Word 2007 doesn't come with a red pen for marking up documents, and you wouldn't want to use one on your computer's screen either, but it doesn't ...