PDF-XChange Viewer is a PDF viewer with the ability to display multiple PDF documents within a tabbed interface. It allows you to add comments/annotations to any PDF file, apply custom stamps from any image/PDF file/Windows clipboard, mark-up pages with text and objects, type directly on any PDF page in "Typewriter" mode. It also supports exporting PDF pages to BMP/JPEG/TIFF/PNG etc., or extract text from a PDF page/file. Additional features include capturing the document with the snapshot tool, rotating and saving a document etc.Note: The free version of PDF-XChange Viewer is missing some features of its commercial siblings, but is otherwise fully functional and totally free for both private and commercial use. Download the portable ZIP package and extract to a folder of your choice. Launch PDFXCview.exe.