PPT Productivity PowerPoint add-in has 100+ time saving features. Format Images features are buttons on the PPT Productivity ribbon which let you quickly crop images and compress image sizes to reduce your presentation's file size for easier emailing.
Compress image sizes
Compress selected or all images in your presentation to reduce the file size for easier emailing.
Feature includes options to compress to sizes recommended for Print, Screen or Email. It also provides an option to delete cropped areas of any selected images. This further reduces the file size and prevents other document users from accessing the cropped area of images.
If you need to make your file size smaller, deleting un-used slide layouts from your presentation's template will also help reduce the size (many companies use very large template files)