Free PDF Annotation Software — Acrobat Reader, Acrobat (PDF), Adobe Acrobat (PDF), Adobe Reader (PDF) Adobe Acrobat, Acrobat Reader, and Adobe Acrobat Reader, are the free Adobe PDF (Acrobat) Readers. Acrobat Reader will allow you to view, read or write PDF files. Acrobat Reader is primarily used by professional software companies to create, edit, and format PDF documents. Acrobat Reader can be downloaded from Adobe's website. Also known as Free PDF Reader. Free PDF Annotation Software — Microsoft Office Acrobat PDF Reader (Acrobat), is an application for reading, writing and editing PDF files. It is primarily available for use with Microsoft Windows operating systems, including Windows 7. Adobe Reader (Acrobat) is a free application for reading, writing and editing PDF documents. It is primarily available for use with Microsoft Windows, Macintosh and UNIX-based operating systems, including Mac OS X v10.7 and Windows XP. Adobe Acrobat and Acrobat Reader are separate products (both with names in the Acrobat package) and are different versions. Acrobat Reader is installed on the hard drive of every computer. Acrobat Reader is available at no cost with the Acrobat Reader subscription. Acrobat and Acrobat Reader are related, but different applications. Adobe Acrobat for Windows is a subscription for reading, writing and editing PDF files. These applications are free to download and use. (The software can still be downloaded and used without a subscription if these features or the program itself are purchased separately). Adobe Acrobat Reader for Windows is a subscription for reading, writing and editing PDF files. These applications are free to download and use, but not free to use if these features or tools are purchased separately. Adobe Acrobat Reader can be downloaded for free on Adobe's website. Top 20 Free PDF Annotation Software With The Entire Adobe Product Family Included These best free and premium PDF annotation software, with the entire Adobe package installed, is designed to be used with PDF, OpenOffice, Word, PowerPoint and other Adobe products for maximum quality PDF editing and annotation. The following tools are included in our Top 20 list, they also include premium features such as PDF Signature, Preview, and Quick View.