Resize Images Easily

Batch Resize Images

Step 1: Select all the images you want to resize.

Step 2: Right click on them and select “Open With Preview.”

Step 3: In Preview, go to Edit > Select All.

Step 4: Once all images are selected, go to Tools > Adjust Size.

Step 5: Enter the width or height value to resize your photos to your liking. If you’re only going to resize the width for example, make sure “Scale Proportionally” is selected. This will ensure that your images are proportionally resized.

Step 6: Save and close.

That’s all there is to it. If you’re batch resizing images on a regular basis, I’d suggest creating an Automator workflow on your Mac. That will save you the trouble of repetitive tasks. See below on how to do this...

http://www.idownloadblog.com/2013/10/19/how-to-resize-multiple-images-mac/

Automator Workflow

Copy the settings in the screenshot below and save:

Quick Action

Photos > Scale Images

Open Automator and create a new workflow file (press Command-N or choose New from the File menu). Then choose Quick Action from the window of available workflow types (this option will look like a gear).
Adjust Actions - so be sure to choose "Photos" from the first drop-down menu at the top of the workflow, and then chooses 'Scale Images' from the second menu.
Under options click 'Show his action when the workflow runs" so you have the choice to decide what and how you wish to rename the files.
Save - name it something like 'Resize Files'
Now whenever you go to the Finder, you can select a group of files or folders, and then right-click them and select your workflow from the Services submenu of the contextual menu.

You can also download and run this Automator Script

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