Greta Williams has a large PowerPoint slideshow which weighs about 26MB and he is looking for ways to compress the PowerPoint file and share it as an email attachment. Before finding methods to resolve this problem, it is essential to know why PowerPoint file size would grow so large and then take actions to compress it. Through analysis, we find that one obvious reason is that there are many high-resolution images and photographs in the presentation. Regarding this problem, the following paragraphs will list some tips to help reduce the size of PowerPoint presentations. 1.Use compressed graphics file formats to reduce the size of PowerPointThere may be many images in graphic formats like bitmap (.bmp) in your PowerPoint presentation. The suggestion is to open bitmap image with a program tha guitar scales t converts images and save the image in one of the following graphic file formats: jpg, gif, tif, wmf. Once your image has been saved under another format, you can reinsert it into your slide. If you do this for all your images, your presentation will be much smaller and it will run smoothly and fast. 2.Save your presentation a second time to reduce the size of PowerPointOpen your presentation, go to File (2003)/Office Button (2007) >> Save As? and give it another name. Then click ?Save?.Doing this you will have a second presentation that often is smaller than the original copy. This is because PowerPoint usually stores lots of redundant information such as earlier drafts and previous used images. Once you save it as another file, the unnecessary redundant information would be purged.3.