Select the dropdown box to choose from pixels, percent, inches, or another unit. Use the Fit into box to specify a preset value or input your own width and height into the boxes provided. You can also select multiple images in Finder, right-click, and choose Open With > Preview.Ĭlick Tools > Adjust Size from the menu bar. For that reason, Preview is the best choice when it comes to quick resizing jobs for images other than those in your Photos library.ĭouble-click on your image to open it with Preview, if it's your default image viewer. Preview does not require you to import an image into a library first, and it lets you unlock the aspect ratio so you can stretch or squish the image if you want to. One of its most useful features is the ability to resize images, which is a task that Preview makes simple. Preview is a robust app that you can use for all sorts of tasks like viewing images, reading documents, and even signing PDFs. Here's how to resize an image on Mac quickly using Preview, Photos, ColorSync Utility, and even the Mail app.
Fortunately, macOS provides you with a few built-in tools that you can use to resize your images easily. If you want to resize images on your Mac, you don't need an expensive app to do it.
