Secure user interface content

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for handling secure user interface content. In one aspect, a method includes receiving, at a data processing apparatus, content over a communication network from a computing system separate from the data processing apparatus; determining that the received content is authentic secure content; retrieving information stored at the data processing apparatus and previously selected by a user for purposes of securing user interface content; rendering the received content, to a display of the data processing apparatus, as a user interface with a visual wrapper, where the visual wrapper includes the retrieved information, visually separates the user interface from other visual elements on the display, and includes an indication that the user interface is secure; and processing input received through the user interface.