Most of the people don’t consider document annotation as fun and easy to use. To proof-read a document, you need to highlight, underline and strike out text or a certain portion of a document as well as leave your comments on the images. A good Document annotation App comes in handy for this proof-reading process of documents which must be done by many reviewers. Thus, annotation Apps which let you view or share review comments with your colleagues, making collaboration and review of online documents incredible easy in real-time. In short, a best-valued document annotation app improves your communication, speeds up collaboration while sharing your work with others.