Media-rich presentations are great. Including high-quality images and videos often adds hugely to audience engagement, but it also adds file size. Adding to your file size means that your presentation is likely to sit on the unfriendly size of email etiquette, but it also means your PowerPoint will run a lot slower (and it may crash – see this article for more on that). But is there an answer? Absolutely. Here are five ways to compress PowerPoint file size for easy emailing and speedy running of your presentation.

View our tips in this video.

The content from the video can be found in the article below.

Method 1: Compress PowerPoint presentations using in-built tools

Did you know PowerPoint has a built-in picture and video compression tool? Well it does, and it’s really easy to use.

Images:

  1. Select a picture on any slide and go to the Picture Tools Format tab on the ribbon.
  2. Choose Compress Pictures in the top left corner: the pop-up box shows you the resolution options you have for the image. For most purposes the web resolution of 150ppi is fine, but if it’s a particularly large screen you’re using, or you’re going to print it, maybe choose the print 220ppi option. This reduces the resolution of the image down to that level, which should help reduce the file size of the image a bit.
  3. If you uncheck the first box, you’ll apply that resolution change to all of the images in the deck, pushing the file size down further.
  4. It’s interesting to note that if you crop an image in PowerPoint, the cropped portion of the image is still there, just hidden away. That also adds to the file size of the PowerPoint, so checking the second box will delete any of these hidden areas, potentially reducing your file size quite a bit more.

Videos:

  1. Navigate to the File tab in PowerPoint, and the Info page should be selected.
  2. If you have video files in your PowerPoint the first button on this page will be to ‘Compress Media’. Click this button and choose the quality you want PowerPoint to compress your file to. 1080p is fine for almost any application, and in many instances 720p will work well too.
  3. Once you’ve chosen a video resolution, you’ll see a new window open showing the progress of the compression. It’ll also tell you how much space has been saved after the compression has been completed – handy.
  4. Check your video after it’s compressed to make sure it still looks good. If you realise you’ve made a terrible mistake, you can also undo the last compression from the same ‘Compress Media’ drop-down menu.

That may do the trick, but sometimes you’ll come across a presentation that stubbornly refuses to yield a decent file size. At this point, you need to get tricksy.

Method 2: Locating large files in your PowerPoint

A problem you can face when you need to compress PowerPoint slides is that, often, you don’t know which object is causing your file size to jump so much. It might be that 90% of your media files are a combined total of 5MB, but there’s one troublesome image that is 30MB on its own. Here’s a fool-proof way of finding which files are causing you problems.

  1. Go to the folder where the presentation is stored. You can see the file size in the bottom left corner. Go to the view tab at the top and select the File name extensions box over on the right-hand side. This puts the file type extension at the end of all your files, so for PowerPoint, it’s .pptx.
  2. Now, copy and paste your PowerPoint file, using Ctrl + C and Ctrl + V. On the copy of the file, click on the .pptx and change it to .zip. Windows will give you a warning that you could ruin your file, but that’s OK, because this is a copy and the original is still safe. Say yes, and then you’ll see that your PowerPoint file has now turned into a zip file.
  3. Open the zip file and you’ll be greeted with a lot of unfriendly looking folders. Go into the ppt folder and there are even more unfriendly folders. Then go into the media folder, and here you’ll find all the images, music, and video files used in your presentation. At this point, you can sort them by file size, and easily see the culprits that are jacking up your storage allocation.
  4. Once you’ve got them, you have a couple of options. You could go into an image editing program, and the Photos app in Windows 10 is actually really good for this. Simply open an image, go to the dots menu on the right-hand side, choose Resize, and then adjust the resolution of the images easily. In most presentations you can take this down to the 2MP setting, or define custom dimensions, with the smallest side around 1000 pixels.
  5. A neat way of actually finding the large image within the deck is to delete the large image in the zip file and change it back to a .pptx from a .zip. When you open it up in PowerPoint your picture will have been replaced by a white box with a red cross in it. Right click on the white box, choose Change Picture, and find a different, or a lower resolution image to fill the gap.

Or, failing that, use PowerPoint again.

Method 3: Reducing picture resolution in PowerPoint

  1. In PowerPoint, find the image that’s huge (using method 2), copy it, and reduce the size of it physically on the slide.
  2. Copy the new smaller image using Ctrl + C, and then paste it using Ctrl + V. Before doing anything else, you’ll see there’s a little pop-up box in the bottom right of the image, which are the paste options. Choose the ‘Picture’ option and your image is now a new picture at a lower resolution (because you made it smaller on the slide). Then use this to replace your existing image, which will cut out the large file size version.
  3. If you’ve got lots of animation on your image or it’s in a group and you don’t want to have to redo it, right click on the new smaller image, choose Save as Picture, and save it somewhere.
  4. Right click on the original picture, and choose Change Picture, which allows you to find another image to replace it with. If you choose the image that you’ve just saved, you shouldn’t see any difference on the slide, but your old large file size image should now have been replaced with the lower resolution, smaller file size image, helping to reduce the file size of your presentation.

Method 4: Use the correct file types

Another tip is to think about the type of image file you’re working with. The three most common are JPEGs, PNGs, and TIFs. JPEGs are the most common. They’re usually slightly lower quality, but it’s often difficult to tell, unless the screen is really good or very large. PNGs provide excellent quality for the size, and also allow you to have transparent areas of your images, but that comes at a cost, with file size usually pretty high. TIF files are often produced by high quality cameras in professional photo shoots. They’re great for print, but overkill in a PowerPoint presentation. So if you’re struggling with the file size on a particular image, try saving it as a JPEG:

  1. In PowerPoint right click your image and choose Save as Picture.
  2. Choose JPEG from the Save as type drop-down options in the window that opens up.

Method 5: Streamline your PowerPoint file by deleting things you don’t need

The last way to keep your file size low is to make sure you don’t have anything in the file that you don’t actually need. What might this be? Well, it’s things like huge Slide Masters and templates with images and graphics on them that you just won’t ever use. To streamline your PowerPoint file:

  1. Open the ‘View’ tab in the PowerPoint ribbon and select ‘Slide Master’.
  2. If you can see a number of masters that don’t appear in your presentation, then delete them.
  3. If your template uses a lot of images, and you can’t delete them, then use one of the other methods to compress them to save a little space.

Tip 1: Always ‘Save As’ – you might not need those layouts this time, bit you might need them in the future.

Tip 2: If you have a number of layouts you don’t use then it might be worth chatting to the team that put the template together to see if they can reduce the number of slides in the interests of keeping file size low.

And all of these tips combined will help you to compress PowerPoint files, resulting in svelte slide decks that you can use and share with ease!

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Written by

Richard Goring

Director

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  1. Image of anilkumar anilkumar says:

    Thank you it was very helpfull

  2. Image of Shivananth Kanagaraj Shivananth Kanagaraj says:

    Very helpful especially the zip details 🙂

  3. Image of Stein Stein says:

    Tip 2b: you can convert the TIFF or PNG files in your presentation to JPEG as follows: selecting it, cut it (Ctrl – x), then use “Paste Special” and choose JPEG to paste it.

  4. Image of Bala Bala says:

    Thanks for you tip. It was very helpful.

  5. Image of Therese Therese says:

    This was SO helpful!! Thanks!!

  6. Image of Jose Garrido Jose Garrido says:

    Very helpfull!

    Thank you!!!

  7. Image of Mimi Mimi says:

    Thanks for the tips and also for sharing the deck!

  8. Image of Silvia Silvia says:

    The .zip trick was extremely helpful! Thank you!

  9. Image of Alain Alain says:

    Hi Karl

    Thank you for this information, it is always a struggle to deal with file size. Just a note, when viewing your video, all views showing PowerPoint and flies information is blurry and we cannot read or see the writing properly .

    Thanks again, always appreciate your tips & tricks

    Alain

  10. Image of Melanie Melanie says:

    Very useful thank you!

  11. Image of Erin Erin says:

    I’ve been struggling for days on this, but the zip trick FINALLY allowed me to figure out the size sinks in my ppt! Thank you!!

  12. Image of chris newman chris newman says:

    try saving the powerpoint as a pdf
    then exporting the pdf back to powerpoint (I use FoxitPhantom pdf for this)

    I just cut a 100 mb file down to 1mb by doing that

  13. Image of Sy Zmatters Sy Zmatters says:

    That ZIP trick is effective but my computer didn’t want to save the PPT as a ZIP file. What I did instead was right-click on every image in my PPT to “save as picture” on my PC. Many of what turned out to be my file size hogs were revealed as PNG files when I tried to save them. I saved them instead as JPG files. Then I returned to that image, right-click and choose “replace image” and I use instead the JPF version. In my case a 6MB file was cut down to 1MB.

  14. Image of Jennifer Ludwick Jennifer Ludwick says:

    Thank you! Super helpful and worked perfectly!

  15. Image of Stephen Williams Stephen Williams says:

    This was incredibly helpful, thanks so much. I was struggling to figure out which images in my presentation were causing the file to get so bloated. This solved my problem quickly!

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