Hello, this is Karin from Obviousidea. We have had several requests about Light Image Resizer for MAC users. As Light Image Resizer is unfortunately not available for OS X, here are some alternatives to look at:

1) You can use MAC’s own “Preview” program for resizing in bulk. Look at the description here:

2) Batch image resizer (supports some camera raw files)

3) EasyBatchPhoto

4) iZoom

If you have any other good alternatives to suggest, let us know!