The basic preview app built into Mac OS is pretty powerful, but it can’t do everything with the same ease this little app can. Whether you need to view or resize a bunch of images, do some basic touch-ups, or convert them to various formats – it’s all very easy to do with XnView MP.
You can easily adjust an image’s color, brightness, and contrast; rename a whole batch, find duplicate images, crop them, edit their metadata, or even create contact sheets. Of course, it supports virtually all image formats such as JPEG, TIFF, PNG, GIF, WEBP, JPEG2000, Camera Raw, HEIC, PDF, DNG, etc, etc, etc.
You’ll be hard-pressed to find a format amongst the 70 different ones included, which this app doesn’t support. When it comes to quick, image processing, this absolutely free app can do it all and will make basic image touch-ups a breeze on the mac (via XnSoft).