Data communication using media files

A web browser may implement a single origin policy that makes an exception for media files such as markup language image files. In cases where the delivery of data to a browser may be blocked by a single origin policy, such as where the data originates from a domain other than the domain that originates the initially presented content, the data may be encoded in one or more media files, such as images, to circumvent the single origin policy. The data may be encoded using height and width dimensions, pixel colors, transparencies, or other characteristics of the media file(s). The media file(s) may be sent to the browser and decoded to access the data.