Viewer may refer to: File viewer, application software that decodes and displays the data in a computer file Image viewer, a computer program capable of displaying digital images Pocket Viewer, a range of personal digital assistants marketed by Casio A person who is engaged in remote viewing Slide viewer, a device for viewing slides of reversal film Television viewer, television industry term for a person watching television ViEWER, a computer program developed for studying visual perception in a virtual 3D environment Waveform viewer, a software tool for viewing the signal levels of either a digital or analog circuit design See also View-Master