Need to reduce the size of your PowerPoint file that contain a large number of pictures. Give this a try
Compress pictures in your presentation
- Select a picture in your document. The Picture Format tab appears.
- On the Picture Format tab, in the Adjust group, select Compress Pictures.
- Under Compression options, do any of the following:
- Make sure that Apply only to this picture is not selected so that the changes you make here will apply to all pictures in the document.
- Select Delete cropped areas of pictures. This option removes the cropped picture data but note that if you delete the cropped picture data, you won’t be able to restore it.
- Under Resolution, select Use default resolution.
Thanks Microsoft. Reduce the file size of your PowerPoint presentations – Microsoft Support
