Resizing Photos on Mac: A Step-by-Step Guide

In this digital age, where sharing photos online has become a common practice, it’s essential to know how to resize your images for different purposes. Whether you need to reduce the file size for emailing or posting on social media, or simply want to create a smaller version of a photo for a specific project, resizing images on your Mac is quick and easy. In this article, we will guide you through the process of resizing photos on a Mac computer.

Using Preview to Resize Photos

One of the simplest ways to resize photos on a Mac is by using the built-in Preview app. Follow these steps:

1. Open the image you want to resize in Preview by double-clicking on the file.
2. Click on ‘Tools’ in the top menu bar and select ‘Adjust Size’.
3. A window will pop up with options to adjust the dimensions of your image. You can choose to resize by percentage or set specific dimensions in pixels.
4. Make sure that the ‘Scale proportionally’ box is checked so that your image doesn’t get distorted.
5. Once you have entered your desired dimensions, click ‘OK’ to apply the changes.
6. Save your resized image by clicking on ‘File’ in the top menu bar and selecting ‘Save’.

Using Third-Party Apps for Resizing

If you’re looking for more advanced features and customization options, there are several third-party apps available for resizing photos on a Mac. Some popular options include Adobe Photoshop, GIMP, and Pixelmator. These apps offer more control over resizing settings such as resolution, quality, and file format.

Batch Resizing Multiple Photos

If you need to resize multiple photos at once, you can use the built-in Automator app on your Mac. Here’s how:

1. Open Automator from your Applications folder.
2. Create a new workflow by selecting ‘Workflow’ as the document type.
3. In the library column on the left side of the Automator window, find and select ‘Photos’.
4. Drag and drop the ‘Scale Images’ action into the workflow area.
5. Choose your desired options for resizing images (e.g., set dimensions or scale percentage).
6. Save your workflow by clicking on ‘File’ in the top menu bar and selecting ‘Save’.
7. To resize multiple photos at once, simply drag and drop them onto your saved workflow.


Resizing photos on a Mac is a simple process that can be done using built-in tools like Preview or third-party apps for more advanced features. Whether you need to reduce file size for sharing online or create smaller versions of images for various projects, knowing how to resize photos will come in handy in many situations. Experiment with different methods mentioned above to find what works best for your needs and start resizing your images with ease!