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At last I have found the easiest way to adjust the size of multiple photos at once! Export the photos from iPhoto - select the first photo and then hold down shift and go to the last photo you wish to export. - Press 'File' 'Export' and from here choose if you wish the photo to be in jpeg, png or tiff format etc - Press 'Export' - 'Save' - choosing your preferred location (and in a new folder if you prefer) Now that you have exported the photos find the photos (or folder) using Finder. You can select one or all of the photos (select the first and hold down shift and go to the last photo) Press 'File' 'Open.' You now have all your photos open in 'Preview' - which allows you to adjust all the photos at once - yeah! Press 'Markup.' Press 'Tools' and then 'Adjust size' Now you can adjust the width and height etc of your photos, then press 'OK.' Done!