You Can Easily Resize Images in Batch With Preview
Preview is one of the best parts of macOS . It is an image viewer, a lightweight PDF editor, and more. Six Colors reminds us that this is probably the easiest way to quickly resize a group of images.
Just open all the images you want in the preview, select them all in the sidebar, then click Tools> Adjust Size. Set the width or height, and the size of all selected images will instantly resize. If you don’t feel like messing with Automator or Terminal scripts , this is probably the easiest way to resize images for those of us who don’t do it often.
Tip: Batch Resizing Preview Images | Six colors