Adobe Reader 9 is an older version of the free browser of documents saved in the popular PDF format (Adobe Portable Document Format). Documents in PDF format always retain the exact appearance of the original document, with font, colour and graphic assortments. Format and appearance will remain intact regardless of the hardware platform and operating system (Windows, Mac OS, Linux or Solaris).

What distinguishes Adobe Reader 9 from previous versions is the added support for multimedia, especially Flash format. Thanks to this it is possible to play back movies and animations placed in PDF files. In addition, the very slow action, which users complained about, was coped with.

The ninth version of Adobe Reader works much faster. Support for digital signatures, 256-bit AES encryption, and the ability to search single or multiple documents at the same time have also been added.