How to Add Comments to a PDF With Acrobat Reader. PDF files enable you to share and comment on content created in a wide range of applications. Adobe Reader, formerly called Acrobat Reader, offers ...

Without opening the file, you can leave comments on Microsoft Office documents, PDFs, pictures, videos, and more. You can do this without having to open the file and share your feedback right away.

Google Drive is getting a new feature that lets users comment directly on Microsoft Office files, PDFs and images uploaded on it. Users will now be able to comment on files right from Google Drive, ...