Leopard: Use Preview to Batch Resize Your Photos
You want to email some photos to your friends and family but need to resize them first. Instead of resizing each photo, one at a time, you can resize them in a single batch and have them done in nothing flat.
1. Select the desired images.
2. Click and drag the selected images to the Preview icon on your dock (it’s best to use copies and not the originals).
3. When Preview opens, press Command Key+A to select all thumbnails in the sidebar.

4. Go to Preview’s menu, click Tools and select Adjust Size.

5. Input the desired size.
6. Click OK.
7. Save the resized images (Click File and select Save All).





