JPEGView is a discontinued image viewer for Mac OS in the 1990s by Aaron Giles.

Initially released in 1991, it was one of the first JPEG image viewers for Mac OS.

[1] 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.

The author has released the source code for JPEGView, although he retains copyright.