How to resize an image on a Mac using Preview Download a free trial and see how quickly you can find the largest and unused files on your Mac. If you want to find the largest files on your Mac, you can use a special application from Nektony called Disk Space Analyzer.ĭisk Space Analyzer scans your hard drive (or any external disk) and shows you what is taking up the most space on it. Large images can take up significant space on your Mac’s hard drive, which can cause your Mac to run slowly.
