PSH is a file extension used by ProShow, a software tool for creating professional slideshow presentations. ProShow was developed by Photodex, a company which specializes in digital image editing software solutions.

PSH file stores a presentation created using ProShow. PSH files holds data necessary to display the presentation (slide layout, effects, animations, hyperlinks, etc.). Resources such as images, video or audio data are not included in PSH files, so if used with given presentation such materials must be included in presentation’s transport bundle.