Mass customization of the user interface is one of the benefits of a portal. Customization makes it easier for a user to complete tasks, and also helps further identify and characterize the user. A user can define the look and feel of a page, the type of content displayed and so forth. The 1.3a release of Jetspeed supports an easy to use Customizer. The goal of the customizer is to provide an easy method to create new pages, selecting portlets and defining layouts for individual pages.

The Customizer is the second level of customization. The authentication process in Jetspeed determines what information is presented to the user initially. This is information can, for example, be dependent on the role of the user.

A screenshot of the Customizer interface is shown below. On the left hand side of the screen is a list of information sources, or portlets. The content of the list can change per Jetspeed installation. Next are two columns where the user can indicate using check boxes what information should be delivered to a Web browser or a WAP device. The selection is stored in the user profile once "Finish" is pressed. The changes in the configuration are immediately available for the user.