Adobe Acrobat Reader is a free program that allows you to view, sign, collaborate, and annotate on PDFs. Adobe Acrobat Reader is the only free software that allows you to view, sign, track and collect feedback on PDFs, and share them. Subscribe to Acrobat Professional if you want more. You can then edit, export and send PDFs as signatures. You can do more than simply open and view PDFs. It's simple to annotate and share documents in order to collect and consolidate the comments of multiple reviewers into a single online PDF. Acrobat Reader Mobile lets you work on documents from anywhere. It has all the tools needed to convert, edit and sign PDFs. You can save a receipt, document, or whiteboard as a pdf by using your device's camera. Acrobat Reader can be connected to Adobe Document Cloud so that you can work on your PDFs from anywhere. You can also access and store files on Box, Dropbox Google Drive or Microsoft OneDrive.