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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
Gimp (Free) Gimp is a free open-source photo editing app that has been on the market for over 22 years and is available for Windows, Mac, and even Linux. Unlike many free apps, Gimp doesn’t have any ads or in-app purchases. Its grey interface might seem a little old-fashioned and it may be a bit sluggish when it comes to complex effects, though. Open, test one image file.export.Quit the application and when I try to open, it just quit (The application iResize quit unexpectedly). I restarted my mac (using MacOS X ver 10.4.11) and still getting the same results- So, I deleted iResize recent preferences in my library and it.
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 .
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.
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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
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In the Preview app on your Mac, open the file you want to change.
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].
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Reduce an image’s file size
In the Preview app on your Mac, open the file you want to change.
Choose Tools > Adjust Size, then select “Resample image.”
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.
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See alsoCrop or rotate a PDF in Preview on MacUse the Touch Bar