TIFF Server for ASP and ASP.Net - Version 1.20c TIFF Viewer for ASP and ASP.NET. Tiff Server for IIS provides an HTML/JavaScript TIFF viewer and a component which runs on the server that converts the required document pages to PNG or PDF format on-the-fly, enabling the images to be viewed by any modern browser. The product is most commonly used to enable web-based delivery of scanned documents either to a web browser.