Open Finder and find the image you want to crop.To crop an image, follow the steps below: When you need to cut out a specific part to resize the photo, you can also do it using the Preview app. The Preview app will instantly resize the picture to the selected resolution. To resize the image proportionally, make sure the Scale proportionally option is selected. Here, you can select a new width and height in pixels (inches, cm, mm, points or percent). Go to the menu bar, click on Tools and select Adjust Size.Alternatively, you can go to the Applications folder in Finder, find the Preview app, launch it and select the file you want to preview. *Since Preview is usually the default image viewer, you can also select the file and press the Space key to preview it. Double-click on the image to open it in the Preview app.*.Whether you need to compress photos for a printer or crop them for a website, the various methods to do so are shown below. Preview is a photo and PDF viewer that lets you customize your photo files on a Mac. This app is available in all versions of macOS. One of the easiest ways to resize a picture on a Mac is by using the Preview application. 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.

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