Change an image’s dimensions
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Note that in this case, the ppi and ppi image resolutions result in the exact same image size. Another option for compressing your images is to simply convert your PowerPoint presentation into the PDF file format.

Compress pictures to reduce the file size in Office for Mac

The reason why this works so well, is the PDF file format automatically compresses images for you and removes other media that could be influencing your file size. That said, you do lose a lot of native PowerPoint functionality in the PDF format, so I would only recommend doing this if you are distributing your slide as PDF handouts.


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To learn everything you need to know about the PowerPoint to PDF conversion process, see our guide here. Compressing images in PowerPoint is one to dramatically reduce your overall file size so that you can more easily share your presentation with other people.

Confining the Image

If you are using a USB drive to share your presentation or you are just running your presentation from your own computer, there is no need to go through the hassle of compressing everything. If you enjoyed this tutorial and want to learn more about our online training courses and other PowerPoint tutorials, visit us here.

Discover 4 weird little PowerPoint tricks that will save you 40 hours of heartache and frustration in PowerPoint this year Join for free today. We collect and protect your information in accordance to our Privacy Policy. That said, Compressing images like this is NOT always necessary. Picture compression options. Apply only to this picture. No other images in your presentation are affected hence why this is the default option.

Compressing Images in Word on Mac - Microsoft Community

You might be given a number range, for example 0 lowest quality to 12 highest quality. You should always select the lowest quality that is still suitable for your purpose. One strategy for selecting the best level is to start with a fairly high quality setting and if it looks OK, try reducing the quality a bit. If the reduced level looks good enough, then try another reduction.

When you hit a quality level that is unsatisfactory, then back up to the lowest level that was still good enough for your purposes. Always keep in mind what the purpose of the graphic is. If you are posting a flower photo to a botanical encyclopedia website, you probably want it to be fairly high quality so small distinguishing details can be clearly seen. If you are posting a flower photo just to celebrate the arrival of spring, then a much lower quality would probably be fine.

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One would rarely ever need this setting. And five times faster to load than the original. Another way to save file size with JPG is to slightly blur the image before you compress it.

An image with fewer sharp edges and crisp details will compress much smaller. Perhaps you intend to use a photo as a background image.


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You can even blur just parts of an image and achieve file savings. Below is a photo of a day lily with a busy background. If we take that same image, select the background in an image editing program like Photoshop, and then blur the selection, only the background will blur and the flower will remain sharp.


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  5. In this example, we end up with a slightly more artistic photo where the focus remains properly on the flower itself and also achieve significant savings in file size. Finally, he changed the default string for the Name key at the end of each file—which is what displays in the Export menu—to match its file name.

    So, for example, let's say he's starting with a JPEG of a scanned A4 invoice at dpi, and that file is 1. When he exports that to PDF format with the standard Reduce File Size filter, the file goes down to 27KB, but it's quite unusable—fuzzy and hard to read.