If you have a large volume of photos that you want to resize, it’s easiest to use the macOS built-in preview feature. You can, of course, use special applications or the corresponding functions in photo editors, but the “native” preview function will allow you to do this quickly and conveniently, and we will tell you how.
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Professional photographers, as well as amateur photographers, often do not worry about the size of the stored photos. In most cases, large files are even preferable, since such images have higher quality and resolution. If you are not worried about the lack of free space on your hard drive, then photos are best stored uncompressed.
Be that as it may, but in some cases, resizing photos is simply necessary. For example, if you want to publish on the website or send several images at once, their size can be a problem. In addition, reducing the number of pixels and size may be required to work with some applications.
Most image-processing applications have image resizing tools, however you can also use the preview function on macOS.
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Open all images
First you need to open all the images in one preview window. If all the necessary files are in the same folder, then the easiest way is to use the option “Select all”, right click and select “Open”.
To select files that are out of order, press ⌘Cmd on the keyboard and click on the necessary photos.
A quick view window will open with an additional column on the left, where all the images from the folder will be located. You can click on any of them and it will open in the main window.
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Reduce image size
In the preview menu, select “Editing”, and then “Choose all”. If you want to resize only one or several files, select them with the mouse.
After selecting all the necessary files, click on “Tools”and then on “Resize”. A new window will open where you must specify the dimensions you need. You can take advantage of the size options offered in the drop-down menu. Fit To. Choose the appropriate one and click on “OK”.
To change the width or height of the images, click on the field for entering values and enter the desired values, leaving the remaining fields blank. Press “OK”, and all the images you select become the same width and height. Scale other measurements up or down to achieve the desired size.
Make sure the opposite “Zoom In Proportionally” there is a check mark, otherwise the image may be distorted when resizing.
At the bottom of the window there is a section “Total Size”which tells you what happens to the images after you click on “OK”. This is very convenient if you change the resolution of each photo separately, and you are interested in the total total file size.
When all necessary changes have been made, save the resulting files by selecting the option in the menu “Save”. When you close the preview window, a notification appears prompting you to return the files to their original form or save with all changes. A notification will be opened for each photo separately, and there is no way to shorten this procedure. You just have to press the enter key on the keyboard until you confirm the actions for each file.
In addition to resizing, in the application View There are several more hidden tools for working with multiple files at the same time (for example, you can flip several photos at once). However, if you want to add accompanying text to your photos, you will have to do this for each file individually. In addition, you will have to confirm the actions for each picture, and this can be a real headache if you work with a really large number of photos. In this case, you better use specialized image editing applications.