ISAPIZip is an add-on for Microsoft Internet Information Server (IIS) or any webserver that supports ISAPI filters. It drastically reduces the amount of bandwidth required to deliver content from the web server. By reducing the size of the pages by up to 90%, it not only delivers faster loading pages, but also reduces the (bandwidth) cost of serving the content. It offers different levels of compression and supports all modern web content, including script pages (PHP, ASP etc.) as well as streaming content, SSL content, PDF files, XML and more. The compression settings can be customized based on paths, extensions, wildcards, MIME type or even on a per-page basis, providing you with a high level of flexibility. The program offers an easy-to-use configuration interface that runs independent from the MMC, eliminating the chance to cause problems with the rather sensitive management console - all changes made to the configuration can be applied instantly without the need to restart the webserver. Additional features include performance, bandwidth, and compression reporting, support for GET and POST data and more.