In addition to all the existing features in the Free PDF-XChange Viewer - the PRO release currently offers:
* Add/Edit/Move Bookmarks
* Delete pages
* Scale Printing
* Move Pages - By Drag&drop in Thumbnails View.
* Custom Stamps (Text and Image)
* Insert/Import Pages (from existing PDF files)
* Extract pages to a new (PDF/Image File)
* Crop Pages/Files
* Customize User Interface (Toolbar options etc)
* Flatten Annotations/Comments
* Insert Blank page
* Measurement Tools
* Summarize Comments
* Export Comments
* Link Editor Tool
* Improved JBIG2 Compression
* Measuring Tools (perimeter and area)
* Scan Direct to PDF
* Convert Images Direct to PDF
* Convert Text files direct to PDF
* Print PDF as booklet, nUP, tiles, etc.
* Shell Extensions including Ifilter Searching !