I convert the files to PDF and then annotate them. There are a lot of options available for marking up PDFs, but not so many for other file formats (as far as I know).
I convert the files to PDF and then annotate them. There are a lot of options available for marking up PDFs, but not so many for other file formats (as far as I know).
Save2PDF and other apps can convert pretty much any file type to PDF. Don't forget that most versions of Microsoft Office can save files to PDF. I use Save2PDF and other than the fact that it doesn't always page break in the same place as the original Office file, mostly an issue with PPT files, I find it very useful.