This step by step guide with images covers how to save PNG and TIFF images as JPG on Mac. We'll look at some free options as well as third-party software.

How to Convert a JPEG Into a TIFF Using GIMP. The GIMP photo editing software includes the ability to convert your JPEG image files into many other file types, including a TIFF file.

With the Preview app, you can convert your files to several different formats, including PNG, TIFF and, of course, JPG.