How to resize an image on Mac 2025

Mac computer picture resizing guide: various ways to easily solve it

This article will introduce several ways to resize images on your Mac, from built-in applications to professional tools, there is always one for you.

Whether it is occasionally resizing images or batching large numbers of images, you can find the right solution.

Picture adjustment tool included with Mac system

The preview application (Preview) that comes with Mac can easily adjust the image size. For simple tuning tasks, no third-party software is required.

Use the preview app to resize the image:

1. Double-click to open the picture, and the preview application is usually opened by default.
2. Click the "Tag" icon in the top menu bar (may be hidden behind the >> icon under the narrow screen).
3. Select the Resize icon:
4. Set the desired size in the pop-up window and click "OK".

Note: The preview application will directly modify the original file by default. To retain the original image, please click "File" > "Export..." to save as a new file.

Batch resize image

The preview application also supports batch resizing images:

1. Select all pictures that need to be adjusted in Finder, right-click and select "Open With...", and select Preview App.
2. The preview app displays selected images and displays the remaining images as thumbnails. Use "Command" "A" to select all thumbnails.
3. Click "Tools" > "Resize..." in the menu bar.
4. Set the resize parameter and click "OK".

Note: This method will directly modify the original file. Please be sure to back up or copy the original image in advance.

Advanced picture processing tools

If you need more advanced features, such as batch editing, adding watermarks, etc., it is recommended to use professional tools such as PhotoBulk.

How to avoid loss of image quality

Shrinking the image may lead to a degradation in quality. To maintain quality, the right size needs to be selected according to the end use. If the image is used for a web page or presentation, just adjust it to the right size. Never enlarge the small image, as this will lead to pixelation.

Many tools provide image quality sliders for adjusting the quality of the final image:

PhotoBulk also provides this feature (under the Format option).

Use Pages to resize the image

Apple's own Pages text editor can also adjust the size of the picture. It should be noted that resizing images may affect the layout of paragraphs and tables.

How to adjust the size of the picture in Pages: select the picture, adjust the size or drag the edges and corners. Check the "Keep proportion" option to adjust the size of one side, and the other side will automatically adjust.

Crop pictures using the preview app

Cropping images is also an effective way to reduce file size.

Crop the image in the preview app:

1. Click the "Tag" icon.
2. Select the area you want to keep.
3. Click the "Crop to Selected Area" icon that appears.

Image format conversion and enhancement

Permute is a universal media converter that can convert pictures, videos, and audio formats. It also supports resizing images:

Luminar Neo is an AI-enhanced picture editor that provides powerful image editing functions, including noise reduction, portrait enhancement, etc., and also supports resizing image size:

Summarize

The Mac system provides a variety of ways to adjust the size of the picture, from simple preview applications to professional image editing software, where users can choose the right tools according to their own needs. The Setapp subscription service provides a complete set of tools, covering a variety of functions such as image editing and media conversion.

Frequently Asked Questions

How to resize images using iPhoto or Photos app?

Open iPhoto or Photos app, select a picture, click "File" > "Export", set the size, and export the picture.

How to resize the image to fit into Mac wallpaper?

Open System Settings > Wallpaper, select picture, select "Adap Screen", "Fill Screen", or "Stretch to Fit".

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