How to resize photos on Mac using Preview app

Many times we need to edit photos by resizing them, but the common myth is that you need a photo editing app to do it. In this article, we will show you how to resize photos on Mac using the built-in Preview app.

Resize photos on Mac

As mentioned above, you don’t really need a photo editing app to resize photos. You can use the default Preview app on your Mac to resize photos.

This method works for photos located on the desktop as well as photos located in a folder almost anywhere on your Mac.

The only place this method doesn’t work is in the Photos app on your Mac. However, you can easily bypass this limitation by simply dragging your photos from the Photos app to your desktop or any folder on your Mac.

Note: If you resize photos with Preview app, you will end up losing the original photo as it will be replaced with the resized photo. If you want to keep the original photo, make a copy of the original photo and then resize the copied photo.

Resize photos on Mac with Preview app

Follow the steps to resize photos on Mac using Preview app.

1. Double-click the photo you want to resize and allow it to open in the Preview app.

Note: If you selected another app as your default photo viewer, right-click the photo and select it Open with > preview.

Open the image with the Preview app on Mac

2. Once the photo opens in the Preview app, click Tool from the top menu bar of your Mac and then click Adjust size… option in the drop down menu.

Resize tab on Mac

3. On the next screen, make sure the option for Scale proportionally is activated (see picture below)

Scale image proportionally on Mac

Scaling the photo proportionally ensures that any change you make to the photo’s width results in a proportional change to the photo’s height, and vice versa.

4. Next, you can choose to resize the image in pixels, centimeters, inches, percent, millimeters or points (see image below).

Resize image on Mac

5. After selecting the resizing unit, enter the new dimensions (width or height) for your image (see image below).

Change height or width on Mac

6. As you can see in the image above, the Preview app also allows you to change the resolution of the images. This is useful if you are also trying to zoom out on the image.

Below are the recommended image resolutions for images depending on where you intend to use them.

  • 72-150 pixels – For images to be used on websites
  • 240 – 300 – When you print the image
  • 600 – When you want the image to be of very high quality, as used in advertising and other applications where high resolution images are required.

7. Finally click on the OK button once you have resized the photo (see image in step 5 above)

Resize multiple photos on Mac with Preview app

The Preview app also lets you resize multiple photos, and you can use this option in case you have too many images that need resizing.

1. Press the command key on your Mac’s keyboard, and then select the photos you want to change

Note: You can also quickly select photos by dragging your mouse over them.

2. Once the photos are selected, right-click on one of the photos you want to resize and then select it Open with > preview option in the context menu (see image below).

Open with Preview on MacNote: All selected photos should open in a single window. Repeat the above step if the selected photos open in separate or multiple windows.

3. Then click on To edit Form the top menu bar on your Mac and then click Choose All Option in the drop down menu (see image below).

Select the

4. Once the photos are selected, click Tool from the top menu bar of your Mac and then click Adjust size… option in the drop down menu.

Resize tab on Mac

5. On the next screen, make sure the option to Scale proportionally is selected and then enter the new one size (height or width) for the photos and click on the OK button (see image below).

Save the changes to the image size

Image size in multiple values?

When trying to resize images on Mac, you may find that the Preview app displays the words “Multiple Values” for width, height, and resolution fields (see screenshot below).

Scale images by percentage

This is because the images you selected to resize are in different units of measurement. In such a case, you can still resize images on your Mac by resizing images to percent (See picture above).

Undo photo size

If you’ve resized a photo to the wrong size or you just don’t like the resizing result, you can follow the steps below to undo the photo resize.

1. Double-click the photo for which you want to undo the resizing

2. Once the photo opens in the Preview app, click file from the top menu bar of your Mac and then click Back to > Browse all versions in the drop-down menu and in the context menu (see image below)

Go back to the previous version on Mac

3. On the next screen you can browse and Select from the previously saved versions of the photo stored on your Mac.

4. Just select the saved version of the photo that suits your needs and then click the To return button

Related

  1. How to rotate photos on Mac with Preview and Photos app

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