Use compressed graphics file formats to reduce the size of PowerPoint. There may be many images in graphic formats like bitmap (.bmp) in your PowerPoint presentation. The Mac OS X Preview is somewhat capable to reduce PDF File Size too. One point missing in the Article is that results vary depending on the PDF contents. It's important to reduce the size of photos you will be using for email and the Web. Learn how to get your pictures down to an appropriate size for online use. This software offers a solution to the users who want to compress the file size of one or more JPG or JPEG files. Just drag and drop the files you would like to PNG files are lossless compressed bitmapped images. While they are compressed, they can still attain large file sizes depending on the type of image data saved—they. Summary: Several tips you have to learn to compress PowerPoint presentation and reduce the size of PowerPoint file. From File Splitter: Do you have a large number of jpgs that you would like to reduce in size to save disk space? Or, are they too huge and you want to automatically. Learn about image resolution as it pertains to digital photography, number of pixels and amount of jpg compression There are two settings that affect JPEG file size, resolution and compression. Experiment with both these settings until you get a balance between the two that works. What Causes File Bloat? A Few Tips to Reduce PowerPoint File Size Western Forestry and Conservation Association January 07, 2005 Western Forestry and Conservation.