Nov 3,  · PDF-XChange Editor is another software that deserves to be named the best PDF annotator for Windows. Its free version is equipped with a range of tools for users to add text boxes, sticky notes, highlights, strikethroughs, or other comments to PDF files. If you want to take notes on a pdf, then: Drawboard is the best pdf annotation software, hands down. Edge is good too. Also have a look at liquidtext, it has a fairly interesting feature set. If you want to take notes, but not necessar