From Nuance Communications:
With the XIFF plug-in, you can view web pages that contain XIFF files. The plug-in is free to distribute. This allows you to view and post scanned documents that contain text and color pictures on your web page that are both small in file size yet high quality.
To create XIFF files, use Pagis Pro or Pagis ScanWorks to scan brochures, articles or any documents that contain color pictures and text. You can post your scanned documents on your web site quickly and easily using Pagis and your favorite web editor.