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Mac How to Resize Image


How to Resize Images on a Mac

If you are a Mac user and need to resize images for various purposes, such as uploading them to a website, emailing them, or simply saving storage space on your device, you can easily accomplish this task with the built-in tools and features on your Mac. In this article, we will guide you through the process of resizing images on a Mac, and answer some frequently asked questions about this topic.

Resizing Images Using Preview

Preview is a versatile application on Mac that allows you to view and edit images. It also provides a simple yet effective way to resize images.

1. Open the image you want to resize in Preview. You can do this by double-clicking on the image file or by right-clicking on it and selecting “Open With” and then choosing Preview.

2. Once the image is open in Preview, click on the “Tools” option in the menu bar at the top of the screen.

3. From the dropdown menu, select “Adjust Size.” This will open a dialog box that allows you to change the dimensions of the image.

4. In the dialog box, you will see options to adjust the image’s width, height, resolution, and more. To resize the image while maintaining its proportions, make sure the “Scale proportionally” checkbox is selected.

5. Enter the desired dimensions for the width or height of the image. The other dimension will adjust automatically to maintain the aspect ratio.

6. Once you have entered the desired dimensions, click on the “OK” button. Preview will resize the image accordingly.

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7. To save the resized image, go to the “File” menu and select “Save” or “Export.” Choose the desired file format and save the image to your preferred location.

Additional Tips for Resizing Images on a Mac

– You can also resize images using the “Image Capture” application, which is primarily used for importing photos from cameras and other devices. Connect your device, select the image, and click on the “Import” button. In the dialog box, select the “Import to” dropdown menu and choose the desired size for the imported images.

– If you frequently need to resize images, you can create an Automator workflow that allows you to resize multiple images at once. Open Automator, create a new workflow, and add the “Scale Images” action. Customize the options according to your preferences, save the workflow, and easily resize images in batches.


Q: Will resizing an image affect its quality?
A: When resizing an image, there is a potential for quality loss if the dimensions are reduced significantly. However, if you only make minor adjustments, the impact on the image quality is usually minimal.

Q: Can I resize images without using any third-party applications?
A: Yes, Mac provides built-in tools like Preview and Image Capture that can be used to resize images without the need for third-party applications.

Q: What is the recommended image size for web uploads?
A: The optimal image size for web uploads depends on various factors, such as the purpose of the image and the desired level of detail. However, a common guideline is to keep images under 1 MB in size and resize them to a width of around 1200 pixels for optimal web display.

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Q: Can I resize images in bulk on a Mac?
A: Yes, you can use Automator or third-party applications like Adobe Photoshop or Pixelmator to resize multiple images simultaneously.

Q: Will resizing an image change its file format?
A: No, resizing an image does not change its file format. You can save the resized image in the same format as the original or choose a different format if desired.

In conclusion, resizing images on a Mac is a straightforward process using the built-in tools like Preview. Whether you need to resize images for web uploads, emailing, or personal use, the methods mentioned in this article should help you accomplish the task efficiently.