Powerpoint — Highly Compressed Download [patched]

Do not insert RAW or PNG files. Use ImageMagick or IrfanView to convert all images to 72dpi JPG at 70% quality before inserting. (Savings: 200MB becomes 30MB)

If the recipient only needs to view the slides and not edit them, converting the PowerPoint to a PDF is the ultimate compression hack. PDFs handle images efficiently and strip away the heavy transition effects and animations that bloat PowerPoint files. A 200MB PPTX file can easily become a 5MB PDF. Powerpoint Highly Compressed Download