Make sure Actions is selected right under the toolbar. Create a New Folderįirst, we're going to have Automator create a folder to place the converted and resized images into. In essence, you're building a step-by-step process that tells Automator what to do with the files you give it.

The process of building an Automator workflow involves selecting the type of Action or Variable you want and then dragging it into your workflow. There are two main sections on the Automator window: Actions and Variables are on the left, while the workflow is on the right.

On the Choose a type for your document dialog box, click Application and then hit Choose.

Open Automator from your Applications folder (or search for it using Spotlight with Cmd + Space) and click New Document.

Note that if your images are all different sizes, you may want to use percent, because it's relative to the original size.

Enter values for one or both the Width and Height and click OK.

If you want the Height to adjust automatically when you enter the Width, or vice versa, make sure to check the Scale proportionally box.

Choose the units you want to use (pixels, percent, inches, cm, mm, or points) from the dropdown box to the right of the Width and Height fields.

Select Tools > Adjust Size from the menu bar.

Click in the left pane then press Cmd + A, or click Edit > Select All from the menu bar to select all the images.

If you have the Preview icon on your Dock, you can also drag the selected files onto the Preview icon to open them. In Finder, select a group of image files, and right-click on them. One hidden but useful feature is the ability to batch convert and resize a large group of images with Preview. The built-in Preview app has been around a long time on macOS, and you can do much more with Preview than just view images. Batch Convert and Resize Images Using Preview But you can also do each separately on your batch of images. For this guide, we'll combine converting and resizing.

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