Once the Automator workflow has been saved as an application, you can keep the app on your desktop or Dock and then drag and drop pictures onto it to resize automatically. If you want the resized images to appear in the same location as the origin folder, choose “Variable” and “Path” as the ‘To’ folder in “Copy Finder Items”, if you choose this option you should be sure that you add the Rename action so that you don’t accidentally overwrite any existing files. Run the workflow to test it, otherwise choose “Save” to create an application that allows for drag & drop resizing of groups of images.

Now click on “Photos” from the left side Library menu, then double-click on “Scale Images”, and select the resized pixel width of images.Optional: From the pull-down menu choose “Add Text” and in the box below add “-resized” to appear after the file name.Optional: Again from the library, double-click on “Rename Finder Items” to add that action as well.From the right-side pull-down menu alongside “To” choose “Other” and create a new folder called “Resized”.Next, from the same Files & Folders menu, find and double-click on “Copy Finder Items”.Now on the right side set the “Ask for Finder Items” choice to ‘Start at’ the Desktop and then click the checkbox next to “Allow Multiple Selection”.

From the left side Library menu, click on “Files & Folders” then double-click on “Ask for Finder Items”.

Launch Automator and select to create a new Application.

This will build a little Mac application that has drag and drop support, the result is that files that are dropped into it will be automatically resized. How to Resize a Group of Pictures with an Automator App on Mac If you’ve never used Automator before, don’t worry, we will walk through the entire process to get it working, and the result will be a simple app that resizes any images that are dragged and dropped onto it. Automator is included in every Mac OS X installation’s /Applications/ folder and is simple to use, making it an excellent tool for repetitive tasks like this.

Automator mac resize image by height