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.
PIXresizer by Bluefive software is an application that can help you easily resize various types of digital images. Even though a version of PIXresizer for Mac can not be found on the Internet, there are plenty other tools you can use to change the size of your photos.
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- Is a minimalist Mac OS X application that offers you the possibility to batch resize multiple images by applying different methods. The app does not allow you to see the files that will or have been processed within its interface, but will work with all the image.
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- 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.
Change an image’s dimensions
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.
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
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].

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.
We are living in a digital era and all the photos that we take nowadays are stored in a digital format. This allows you to store thousands of images on a device that can easily fit in your pocket. But maybe the biggest advantage of having your pictures in a digital format is that you can easily edit them. The most common edit that is usually applied to a photo is the resize operation. That is because our digital cameras take photos at resolutions that are too high for everyday tasks like posting on a website or sending via email. Hence, the need to resize pictures to a resolution that suits our needs arises.
There are a lot of macOS apps out there that allow you to resize pictures, but most of them only let you resize one image at a time, which can be very time-consuming if you are dealing with a lot of images. For such a task you will need a batch image resizer tool that will give you the possibility to resize hundreds or even thousands of images in a single processing session. You are probably wondering if such a macOS app exists. Well, it does and its name is ImageSize. In this article I will present to you the many features of this app and what it can do to make your life a lot easier when it comes to resizing photos.
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How do I reduce the size of a picture on a Mac?
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Let us consider the following scenario that I am sure a lot of you are very familiar with. You need a cool photo for your blog post so you search your photo collection and you find the perfect one, but when you post it online you realize that it is too large and it does not fit well in your blog’s page design. So you have to reduce its size. This is where ImageSize comes in with its friendly user interface and powerful image resize engine.
Choose the image that you want to resize, select the Free Resize and Pixels options and input the new width and height of your image. Once you are satisfied with your settings, choose the Format and Output Folder of your resized image and press the Resize Images button. So, as you can see, with ImageSize you can resize your photo in just a few seconds.
How to resize multiple images at once in Mac OS
But what happens when you have to resize a thousand images instead of one? ImageSize is the best macOS app out there for such a task. Select the photos that you want to resize, input the new width and height using pixels or percents, choose the format and output folder of your resized photos and you’re done. Resize all your photos in just three easy steps. If you want to see how to batch resize pictures on macOS, take a look at the video below:
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Free Photo Resizer For Mac
Suited for both professional photographers that resize hundreds of photos on a daily basis and simple macOS users that need to resize an image or two once in a while, ImageSize is the best solution on the macOS market for resizing images. It is worth mentioning that the app can also batch convert and rename image files so you can use it to give meaningful names to your images in order for them to be easier to find. So purchase this powerful image resizer today for only $3.99 and improve your productivity when it comes to resizing photos.