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Preview User Guide


You can resize or rotate an image opened in Preview to fit into a particular spot. You can also reduce the file size to save disk space or to download an image more quickly.

Change an image’s dimensions

  1. In the Preview app on your Mac, if the Markup toolbar isn’t showing, click the Show Markup Toolbar button , then click the Adjust Size button .

  2. Enter new values for width and height, or click the “Fit into” pop-up menu and choose a size.

    • Resize the image by a percentage: Choose “percent” from the pop-up menu next to the Width and Height fields, then enter the percentage in those fields.

    • Force the image to keep its original proportions: Select “Scale proportionally.” If you change either the width or height, the other value changes to maintain the proportions. If you choose a size from the “Fit into” pop-up menu, the image’s width or height may be smaller than the chosen size to maintain the proportions.

    • Make the image’s dimensions smaller without losing any detail: Deselect “Resample image” before changing the width or height.

Tip: To resize multiple images at the same time, display the images in the same window, select them in that window’s sidebar, then choose Tools > Adjust Size.

Rotate or flip an image

  1. In the Preview app on your Mac, open the file you want to change.

  2. Do any of the following:

    • Rotate an image: Select the image, then click (or use the Touch Bar) to rotate the image to the left. Continue clicking to keep rotating.

      To rotate the image to the right, press and hold the Option key, then click until you’re done rotating the image.

    • Flip an image: Choose Tools > Flip Horizontal or Flip Vertical.

Tip: To rotate or flip multiple images at the same time, display the images in the same window, choose View > Thumbnails, select them in that window’s sidebar, then choose Tools > [Rotate or Flip].

Reduce an image’s file size

  1. In the Preview app on your Mac, open the file you want to change.

  2. Choose Tools > Adjust Size, then select “Resample image.”

  3. Enter a smaller value in the Resolution field.

    The new size is shown at the bottom.

Tip: To reduce the file size of multiple images at the same time, display the images in the same window, select them in that window’s sidebar, then choose Tools > Adjust Size.

See alsoCrop or rotate a PDF in Preview on MacUse the Touch Bar

If you’ve ever needed to resize or compress an image on your Mac but thought you didn’t have the right software to do so, think again!

In a few simple steps, you can easily resize an image, crop a specific focus area of an image, or compress your image. Better yet, you can do all of these tasks without having to download expensive editing software.

We’ll walk you through some simple step-by-step guides on how to edit and compress image files quickly and easily using the Preview application on your Mac.

How to resize an image in the Preview app

First, open Finder on your Mac. In Finder, navigate to the place where your desired image is located (such as Desktop, Downloads, or Recents) and open the image.

The image should open by default in Preview. If it opens in another application instead, you can right-click the image using the mouse (or two-finger click the image on your Mac trackpad) and choose to open it with the Preview application.

Once you’ve opened the image file in Preview, go to the Preview menu on the top left of your screen, select Tools, then Adjust Size. From here, you can resize your image by adjusting its height and width. Check the “Scale Proportionally” box to make sure your image won’t be distorted or skewed after it’s resized.

Right under the image dimensions adjuster, you can find the Resulting Size of your image.

Another useful image editing tool in the Preview application is the Crop feature. This feature allows you to easily select the focus area of an image and crop accordingly.

First, click and drag to select the desired area of your image. A dotted outline will appear to highlight your selection.

From here, you can adjust the dimensions of your final image by clicking and dragging the blue circles until you’re satisfied. Then, go back to Tools and select Crop from the dropdown menu to crop the desired part of the image. (You can also crop an image with the keyboard shortcut Command + K).

This feature is especially useful when you want to change the size of an image without reducing its quality (or just remove a particular area of an image).

Cropping an image, playing a movie, and handling dozens of active apps simultaneously, your Mac may get slow and laggy. Trying to detect heavy consumers and optimize your Mac’s performance manually may take some time. CleanMyMac X is a dedicated Mac cleaner that can speed up your Mac in a couple of seconds. Just start Smart Scan to let CleanMyMac X clear your Mac of junk, determine and terminate conflicting processes. Follow the link to give CleanMyMac X a try.

Best Photo Editing Apps For Mac

How to compress an image in the Preview App

Whether you are looking to easily share an image through email or save disk space on your Mac, compressing an image file is a simple way to reduce a file size without sacrificing quality. Compressing an image is also useful when uploading an image somewhere that has a maximum file size limit.

To compress your image, open Preview. Click Open from the Preview menu and choose Open to choose an image you want to compress. Then navigate to the Tools option and select Adjust Size.

At the top of the Adjust Image window, you’ll see the “Fit into” option. The default selection is Custom, but you can select different pixel dimensions from the dropdown list and compress your image. Then take a look at the Resulting Size field to see how your file size has changed.

There’s also another way to compress an image using Preview. But this method affects the quality of your image.

  1. Open image in Preview.
  2. Go to the Preview menu and select File.
  3. Choose Export.
  4. Change the format of the image to JPEG.

Here you can adjust the quality, which in turn will compress the size of the image.

Locate and remove large and old files

If you’re looking to save additional disk space, check out CleanMyMac X and its Large & Old Files feature. It finds the heaviest files on your Mac or external drives and groups them by kind, size, and access date. This saves you the burden of navigating through endless files and folders—instead, you can decide which files you’d like to remove based on a comprehensively arranged list of files.

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If you want a broader perspective, you can go to another tab - Space Lens. It builds a virtual map of your storage, showing the size and location of each file.

To get to use Space Lens and other features of CleanMyMac X:

  1. Download CleanMyMac X - a free trial is available.
  2. Install and launch the app.
  3. Go to Space Lens and press Scan.

Once CleanMyMac X shows you all the files you have, you can simply select the ones you don’t need and press Remove.

Hopefully, now you can crop and compress your images. And if you have been hoarding lots of files, decluttering your Mac once in a while is a must, and CleanMyMac X will help you with that. That’s all for today!