With PDF Stacks, you can organize, find and browse, search, read, view, annotate and share your PDF files, papers, research and journal articles with a single click. It saves you time: no more wondering around your computer to find a PDF file. You can organize your documents and let PDF Stacks automatically manage your PDF files. The spotlight search enables you to find your research papers or PDF files in a snap. There is also full screen reading and annotating of your PDF files which makes your life easier.