You can batch conversion image in Mac OS x, Mac graphics converter how to use the preview to batch adjust any group of image. all you need to do is drag and drop the images onto the icon and they will be instantly resized. This paper introduces some image even edit adjustment you can perform such as cutting, printing, filling, rotation and scale.

Follow these three simple steps to convert your graphic quickly and easily:
1. First of all, launch Mac graphics converter. Select the folder, pictures of you.
2. Choose target folder, and select an output format.
3. Click "convert" button to conversion. Graphics converter will automatically convert all image. That's it!