How to Resize a Photo on Mac: A Comprehensive Guide

Hello there, Mac users! If you’re struggling with resizing photos on your Mac, you’ve come to the right place. It can be a bit confusing at first, but with the right steps and tips, you’ll be resizing photos like a pro in no time.


Resizing a Photo on Mac: Step-by-Step Guide

Step 1: Open the Image you Want to Resize

To resize a photo on your Mac, start by opening the image you want to resize in Preview. You can do this by double-clicking the image file or by dragging and dropping it onto the Preview icon in the dock.

Step 2: Go to the Tools Menu

Once you have the image open, go to the Tools menu and select “Adjust Size.” This will bring up the “Adjust Size” dialog box.

Step 3: Enter the New Dimensions

In the “Adjust Size” dialog box, enter the new dimensions you want for your image. You can do this by either specifying the dimensions in pixels or by using the percentage slider. Make sure to uncheck the “Scale proportionally” box if you want to resize the image to specific dimensions.

Step 4: Save the Resized Image

Once you have entered the new dimensions, click “OK” to save the changes to your image. You can then save the resized image by going to the File menu and selecting “Save” or “Save As.”

Step 5: Use the Crop Tool

If you want to crop your image before resizing it, you can use the Crop tool in Preview. Select the Crop tool from the toolbar, and then click and drag to select the portion of the image you want to keep. Once you have the selection, go to the Tools menu and select “Crop.”

Step 6: Adjust the Image Quality

If you want to adjust the image quality, you can do so in the “Adjust Size” dialog box. Click on the “Quality” drop-down menu and select the desired quality level. Keep in mind that reducing the quality will also reduce the file size.

Step 7: Use the Loupe Tool

If you want to zoom in on specific areas of the image, you can use the Loupe tool in Preview. This will open a window with a magnified view of the area under your cursor.

Step 8: Add Annotations

If you want to add annotations to your image, such as text or arrows, you can use the “Annotate” toolbar in Preview. This toolbar includes a variety of tools for adding annotations to your image.

Step 9: Use the Color Adjustments

If you want to adjust the color of your image, you can do so in the “Adjust Color” dialog box in Preview. This includes adjustments for brightness, contrast, saturation, and more.

Step 10: Use the Filters

If you want to apply filters to your image, such as black and white or sepia, you can do so in the Filters menu in Preview. Preview includes a variety of filters that you can apply to your image.

Step 11: Use the Markup Tools

If you want to add more advanced annotations, such as shapes or signatures, you can use the Markup tools in Preview. These tools include a variety of options for adding markup to your image.

Step 12: Save Your Changes

Once you have finished making your changes, be sure to save your image. You can do this by going to the File menu and selecting “Save” or “Save As.”


Now that you know the steps for resizing a photo on your Mac, let’s talk about the different ways you can use Preview to manipulate your images. Preview is a powerful image editing tool that includes a variety of features you might not be aware of.

For example, if you want to adjust the color of your image, you can use the “Adjust Color” dialog box. This includes options for adjusting brightness, contrast, saturation, and more. You can also use the Filters menu to apply a variety of effects to your image, including black and white, sepia, and more.

In addition to these basic image editing tools, Preview also includes advanced annotation features. The Markup tools in Preview allow you to add shapes, signatures, and more to your image. This is especially useful if you need to annotate a screenshot or add branding to an image.


Tips and Tricks for Resizing Photos on Mac

Now that you know the basic steps for resizing a photo on your Mac, here are some tips and tricks to help you get the most out of Preview:

Tip 1: Use Keyboard Shortcuts

Preview includes a variety of keyboard shortcuts that can help you work more efficiently. For example, you can press Command + Shift + S to quickly save your changes.

Tip 2: Use the Loupe Tool with the Option Key

If you want to use the Loupe tool to view specific areas of the image, you can hold down the Option key to change the loupe to a magnifying glass. This allows you to zoom in and out on the image while still seeing the full image in the background.

Tip 3: Use Multiple Windows

If you are working with multiple images at once, you can open each image in a separate window to make it easier to switch between them. You can do this by going to the File menu and selecting “New from Clipboard” or “New from File.”

Tip 4: Use the File Format Menu

When saving your image, be sure to select the appropriate file format for your needs. If you need a high-quality image for printing, for example, select the TIFF or PNG format. If you need a smaller file size for web use, select the JPEG format.

Tip 5: Use Preview’s Share Sheet

If you want to share your resized image with others, you can use Preview’s Share Sheet to quickly send it via email, Messages, or AirDrop.

Tip 6: Use the “Revert to” Menu

If you want to discard your changes and start over, you can use the “Revert to” menu in Preview. This allows you to revert to the original version of the image.

Tip 7: Use the “Duplicate” Command

If you want to make a copy of your image before making changes, you can use the “Duplicate” command in Preview. This allows you to work on a separate copy of the image without affecting the original.

Tip 8: Use the “Fit to Screen” Command

If you want to quickly fit your image to the screen, you can use the “Fit to Screen” command in Preview. This allows you to view the entire image without needing to scroll or zoom.

Tip 9: Use the “Open Recent” Menu

If you frequently work with the same group of images, you can use the “Open Recent” menu in Preview to quickly access them. This menu shows you a list of your recently opened images.

Tip 10: Use External Editing Software

If you need more advanced image editing tools than Preview provides, consider using external software such as Photoshop or Affinity Photo. You can easily open your image in these programs from within Preview.

Advantages and Disadvantages of Resizing Photos on Mac

Resizing a photo is an essential task for anyone who works with digital images, whether for personal or professional use. If you’re a Mac user, you may wonder how to resize a photo on Mac. There are several ways to do it, and each method has its advantages and disadvantages.

Advantages of Resizing Photos on Mac

1. Saves disk space: Resizing a photo to a smaller size makes it take up less space on your hard drive, which can be helpful if you have limited storage space.

2. Faster uploads: When you resize a photo to a smaller size, it will upload faster to websites or cloud storage services like Dropbox or Google Drive.

3. Better for email: If you’re sending photos via email, resizing them to a smaller size will make them easier and faster to send and receive.

4. Easier to share on social media: Sharing photos on social media platforms like Instagram, Facebook, or Twitter is more accessible if they’re smaller in size.

5. Improves web page load times: If you’re creating a website, resizing your photos will help to reduce your website’s load times, ensuring that your visitors have a better user experience.

6. Can improve the quality of images: If you’re resizing an image to a larger size, you can use software that employs algorithms to improve the quality of the image.

7. Protects your original photos: Resizing a copy of your photo means that you can work with it and make changes without affecting your original file.

8. More accessible: Most image editing software, including native macOS apps, can resize photos, making it easy to find a tool that works for you.

9. Saves money: Resizing photos can help you save money on storage solutions, as you won’t need to upgrade your storage as frequently when your photos take up less space.

10. Can be done quickly: Resizing photos doesn’t take much time and can be accomplished in just a few clicks, so it’s an easy and quick solution for those who want to make changes to their images.

Disadvantages of Resizing Photos on Mac

1. Can reduce image quality: When resizing an image to a smaller size, the quality may be lost, resulting in a pixelated or blurry image.

2. Limited software: If you want to resize a photo on Mac, you need to use image editing software, and your options may be limited, depending on the version of macOS you’re running.

3. Can distort images: If you resize an image to an extreme size, it can become distorted, making it difficult to identify or use.

4. May require trial and error: Resizing an image can be an iterative process, which means it may take several attempts to get the desired result.

5. Can take up time: Even though resizing photos only takes a few clicks, it may still be time-consuming if you have many images you need to resize.

6. Original file may be lost: If you’re not careful when resizing your photos, you may accidentally overwrite your original file, resulting in data loss.

7. Incompatible format: Depending on the format of the image, resizing may affect its compatibility with certain software or platforms.

8. May require additional software: Depending on your needs, you may need to use additional software to resize images, which can be costly or require technical expertise.

9. Can be confusing: For some, resizing photos may seem like an intimidating task, especially if they lack the knowledge or experience needed to do it correctly.

10. May require specific sizes: When resizing images for use on social media or other platforms, you may need to follow specific dimensions, which can be challenging if you’re unfamiliar with the requirements.


1. How do I resize a photo on Mac?

You can resize a photo on Mac by opening the image in the Preview app and selecting the “Tools” menu. From there, choose “Adjust Size” and enter the new dimensions for your image.

2. Can I maintain the aspect ratio when resizing a photo?

Yes, you can maintain the aspect ratio of your photo when resizing by selecting the “Constrain Proportions” option in the “Adjust Size” menu.

3. What image file types can be resized using Preview?

Preview supports most popular image file types, including JPEG, PNG, TIFF, and PDF documents that contain images.

4. Can I resize multiple photos at once on Mac?

Yes, you can resize multiple photos at once by using the “Batch Change” feature in Preview. This can be accessed from the “Tools” menu.

5. How much will the image quality be affected when resizing a photo?

Image quality can be affected when you resize a photo, but it depends on the extent of the changes you make. Resizing a photo to a larger size may result in some loss of quality, while downsizing may actually improve the quality of the image.

6. Is there a maximum image size that can be resized using Preview?

Preview can resize images of any size, but keep in mind that extremely large images may take longer to process.

7. Can I undo resizing changes made using Preview?

Yes, you can undo resizing changes made using Preview by selecting “Edit” > “Undo” or using the keyboard shortcut “Command-Z”.

8. Can I save the resized image under a different name in Preview?

Yes, when you are done resizing your image, simply select “File” > “Save As” and choose a new name for the resized image.

9. What if I don’t want to completely replace the original image when resizing?

You can choose to create a duplicate of the original image in Preview and then resize the copy without affecting the original.

10. Can I use Preview to crop an image as well?

Yes, you can use the “Tools” menu in Preview to crop and resize images.

11. What if I accidentally saved over the original image?

If you accidentally saved over the original image, you may not be able to recover the original version. It’s always a good idea to make a backup before making any changes.

12. Can I set a custom resolution for my resized image?

Yes, you can set a custom resolution for your resized image using the “DPI” field in the “Adjust Size” menu.

13. Will resizing a photo affect the file size?

Resizing a photo may affect the file size, depending on the new dimensions and image quality settings you choose. Usually, larger images result in larger file sizes.

How to Resize a Photo on Mac

If you’re looking into resizing an image on your Mac, you’re in luck! Macs come with a built-in photo editor called Preview that makes it easy to resize images in just a few clicks. In this article, we’ll show you how to resize a photo on Mac using Preview.


Resizing your images on Mac can be done quickly and easily with Preview. With just a few basic steps, you can modify the size of your image to fit any need. Whether you need a smaller image for web use or a bigger picture for print, Preview has you covered.


Thank you for reading our article on how to resize a photo on Mac! We hope you found this tutorial helpful and that you’re now able to effortlessly modify your images to the right size. If you have any additional questions or comments, please feel free to reach out to us.

Until next time, happy editing!