PDF-XChange Viewer is an alternative viewer for PDF files that enables you to view and annotate PDF files. You can add text, sticky notes, and other annotations and save them to the file, which will be compatible with the standard Adobe PDF reader. The program also includes OCR functionality, as well as options to extract text and images, export a documents to image formats, and more. PDF-XChange Viewer offers a modern, tabbed interface and an attractive set of features.