If you need to convert from one graphics format to another, you need GraphicConventer from Lemke Software (www.lemkesoft.com/). It's recently been revved to version 8.5, completely rewritten and now supports 64-bit and 32-bit Intel-based systems.

GraphicConverter 8.5 also adds support for Retina display Macs, a slideshow with find feature, and more. Other new features added are: support for 16 bit per channel grayscale raw import; split red/green/blue batch; a batch function to extract all used keywords to convert&modify; an option to disable indicator for unapplied xmp changes; zoom support to slideshow with gesture; dialog upon click of rotation indicator; a rating tool to image window toolbar; an option to open a browser with a default path upon launch; an option to use EXIF preview as browser thumbnail; the ability to import old picture clippings at 64 bit; the ability to import old StartupScreen variants; and editable number fields for display of slider values.

And, of course, Graphic Converter 8.5 has all the features of its predecessors. Exif creation verifies gps tags before export. The keyword palette supports import of plain keywords list. Next/previous icons use the last display scale for the new image. And more.

GraphicConverter is a tool for image conversion from more than 200 file formats.
Version 8.5 is a free update for users of version 7.x and 8.x. It's downloadable from the Updater within the application menu. For new users the cost is US$39.95.