The program supported viewing JPEG files with or without QuickTime installed as well as featuring slideshows (something that Apple's PictureViewer couldn't do). JPEGView was a default helper application for a number of web browsers, including both Internet Explorer and Netscape Navigator.
JPEGView provided the capability to view JPEG images with or without QuickTime installed, and it also supported slideshow presentations, which was a feature that Apple's PictureViewer lacked.