How to Build Your First Mac Shortcut

Build a Shortcut on Mac: open the Shortcuts app, click plus, drag actions from the library, then enable Use as Quick Action to run it from Finder.

1. Open Shortcuts and start a new one. Open the Shortcuts app from your Applications folder. Click the plus button in the toolbar, or press Command + N, and an empty editor window opens. The flow you are building runs down the left side. The Actions library is the panel on the right.
2. Add the action that reads your selection. Type Get Selected Files into the search field at the top of the Actions library. Drag the result into the empty flow, or double-click it to drop it in. This action hands the shortcut whatever is highlighted in the frontmost Finder window at the moment it runs.
3. Resize the images to a fixed width. Search for Resize Image and drag it in below the first action. It picks up the files from the step above as its input automatically. Set the Width field to 1200 and leave the height set to Auto so each image keeps its proportions.
4. Save the copies into a folder. Search for Save File and drag it in last. Turn off Ask Where to Save, then click the folder field and choose a destination, such as a folder named Resized inside Pictures. Your originals are untouched. The action writes new files.
5. Name it, then run it once. Click the shortcut name at the top of the editor and type something plain, such as Resize to 1200. Select a few images in a Finder window, come back to Shortcuts, and click the run button in the toolbar. Then check the destination folder.
6. Put it in the right-click menu. Open the Details pane using the info button at the top right of the editor window. Tick Use as Quick Action, then tick the Finder and Services Menu boxes beneath it. The shortcut now appears under Quick Actions when you right-click files in the Finder.