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How to Compress PowerPoint | 6 Ways to Reduce PowerPoint File Size

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Before you go to the effort of compressing your PowerPoint presentation, ask yourself if you even need to bother?

If you are not having trouble sharing your presentation, or you don’t need to email it to anyone (maybe you can share it on a USB instead), don’t worry about how large your presentation is.

If you’ve added lots of images, videos, graphics and 3D models, your PowerPoint presentation might be huge, but so what?

Only follow these steps if you find that your presentation is becoming unwieldy or too big to share. And then, only do the minimum required to get to a functional state.

Feel free to jump around depending on what you have in your presentation.

1. Compress Images in PowerPoint

If you have lots of images in your presentations, you can save a lot of space by compressing your images in PowerPoint.

In the below picture you can see the results of a presentation with pictures that I compressed using different compression options.

Examples of the reduced PowerPoint file sizes after compressing images in your presentation

Notice in the picture above that the HD (96 ppi) compressed file size is 17x smaller than the original or high fidelity decks. Just make sure when you compress your images like this that you pay attention to the quality of the images.

The more you compress an image, the grainery it will become.

Ideally you want to use the HIGHEST quality resolution as possible, especially if you are presenting on a large overhead projector.

Steps to compress images in PowerPoint, Pictures tools format tab, select compress and choose your compression options

To compress an image in PowerPoint, select the image you want to compress then:

  1. Navigate to the Pictures Tools Format Tab
  2. Select Compress Pictures
  3. Choose your Compression options (Beware of unchecking Apply only to this picture)
  4. Choose your Resolution
  5. Hit OK

Note that when choosing your compression options, you have the option to Apply only to this picture.

Unchecking Apply only to this picture tells PowerPoint to sweep through your entire presentation and compress ALL of your images (which might not be what you want).

For more help choosing the right resolution and compression options for your images, see our guide here.

2. Compress Videos in PowerPoint

Videos and media files (like audio files) can be huge!

So if you have a video or other media file in your presentation, compressing it can have a dramatic effect on the size of your presentation (or better yet, remove it if you don’t need it).

Use the default video compression options in PowerPoint, I saw the following results (making the file size up to 6.8x smaller).

Examples of reduced PowerPoint file size after compressing videos and other media graphics

When choosing a compression size, at a minimum compress into the Full HD (1080p). Notice that the FUll HD (1080p) reduced the original file size by half from my raw video footage.

Full HD (1080p) is high quality for any overhead projects or monitor. If you need to save more file size, you can use the smaller formats, just double check your video quality on the actual projector you will be presenting on to make sure it doesn’t appear too grainy for you.

The steps to compress videos in PowerPoint, file tab, info and Compress Media

To compress videos and/or media files in PowerPoint, simply:

  1. Navigate to the File tab
  2. Select the Info tab
  3. Open the Compress Media drop down
  4. Choose a compression file size (Full HD 1080p, HD 720p or Standard 480p)

Choosing a compression size, PowerPoint begins compressing all of the videos (one at a time) within your presentation, and then shows you how much space you saved for each video.

For example, for the video I compressed below, you can see that I saved 872.5 MB.

3. Clean out your Master Views

Before you worry about compressing any of your images or videos, see if you can reduce your file size by removing hidden and unused elements in your presentation.

of the culprits of a large file size (especially if you don’t feel like you have that many slides in your presentation), is hidden graphics on your different Master Views in PowerPoint.

The three different master views in PowerPoint

While you don’t want to just delete anything you find in these Master Views (someone set them up for a reason in the first place after all), it’s also not uncommon to find excessively large graphics or things you can eliminate in these views, to reduce your file size.

To see how to walk through and clean out these different Master Views, see the short PowerPoint tutorial below.

Slide Master View - Hidden Graphics

Navigate to the slide master from the View Tab, select Slide Master command

To navigate to the Slide Master view to spot check your child slide layouts, simply.

  1. Navigate to the View Tab
  2. Select Slide Master
  3. Spot check your Child Slide layouts

In the Slide Master view you are want to look at your child slide layouts and see if there are any with extremely large pictures or media files that you are not using.

If you are not using those pictures or media files, you can decide whether to just compress them (as mentioned above) or delete them if you don't need them.

You might also find a lot of duplicate Child Slide layouts that you can simply remove. This happens when people copy and paste between presentations that don’t have a consistent or well built PowerPoint template.

To learn how to properly build a PowerPoint template, see our guide here.

Handout Master - Hidden Graphics

Navigate to the Handout master from the View Tab, select Handout Master command

To navigate to the Handout Master view of your presentation, simply:

  1. Navigate to the View Tab

  2. Select Handout Master in your Ribbon

  3. Spot check your Handout Master

On your Handout Master, you are looking for excessively large company logos or graphics that you can compress or remove.

PowerPoint shapes such as rectangles, lines and text boxes are fine (removing them will not impact the size of your presentation).

Formatting your Handout Master is a great way to create customized slide handouts of your presentation, but if there are excessively large graphics here, compressing or removing them can help you decrease the size of your presentation.

Notes Master - Hidden graphics

Navigate to the Notes Master from the View tab, click the Notes Master command

To navigate to the Notes Master view of your presentation, simply:

  1. Navigate to the View Tab
  2. Select Notes Master in your Ribbon
  3. Spot check your Notes Master

On your Notes Master, you are looking for any company logos, design elements or other large graphics that someone has added. You don’t have to worry about any default PowerPoint shapes like shapes, lines or textboxes (these will never increase the size of your presentation).

Formatting the Notes Master is a great way to create branded handouts for your speaker notes, but if there are large graphics here that you are not using, compressing or removing them can help reduce the size of your presentation.

For additional help on printing your speaker notes, click here.

Example of saving 872.5 MB after compressing a video in PowerPoint

4. Swap out 3D models and other media

If you have the Office 365 subscription, you can now add 3D models and graphics into your presentations from the Insert Tab, 3D Models dropdown.
Inserting a 3D model in PowerPoint, from the Insert tab select 3D models

Below are examples of animated 3D models you can insert into PowerPoint (below I’ve selected the rhinoceros).

Examples of the animated 3D models available in the Office 365 subscription of PowerPoint

These 3D models can be quite large and there is currently no way to compress these graphics. Notice in the picture below how adding just one animated 3D model adds over 26 MB to the PowerPoint file.

Example showing that a single 3D model can be over 25 MB, significantly increasing your file size

So if you need to reduce the size of your presentation, try to replace any 3D models with a static image. For example, instead of using the 3D rhinoceros, use a picture of a rhinoceros instead.

Notice in that the resolution picture of the rhinoceros below is still 7x smaller than the 3D model on the left (and you could save even more space by compressing the image as discussed above

Example of how how a picture of a 3D model is seven times smaller than a 3D model itself

5. Convert PowerPoint to PDF

If you are distributing your presentation as a PDF file or handout, instead of trying to compress your images and videos, you can simply convert your presentation to the PDF file format to reduce your file size.

That’s because the PDF conversion process will automatically compress your images, remove your video and media files, 3D models etc.

Save a PowerPoint as a PDF file through the Save As dialog box, F12 on your keyboard

To convert your presentation to the PDF file format, simply.

  1. Hit F12 to open the Save As dialog box
  2. Change the File Type to PDF
  3. Click Save

Just be aware that NOT everything in your presentation will properly convert to the PDF file format.

For more information about how to convert PowerPoint to PDF, click here.

6. Compress PowerPoint as a ZIP file

As a last resort, you can also try to reduce the size of your presentation by compressing your presentation in the ZIP file format.

While this technique compresses everything in your presentation, it doesn’t always save you a ton of space.

For example, notice in the picture below how my file size has only been reduced by 4MB using this ZIP folder technique.

Example of how much a zip file will reduce your PowerPoint file size

If you need to keep all of your videos, graphics, 3D models etc., this might be your best bet, just keep in mind that depending on what is in your presentation, it might not save you a ton of room.

If you have a large file and need to share it with someone else, you are probably better off uploading it to something like OneDrive, Google Drive or Dropbox, and sending them a link to download the file.

To compress a PowerPoint, right-click the file in File Explorer and select send to compressed (zipped) folder

To compress your PowerPoint presentation in the ZIP file format, simply:

  1. In File Explorer, Right-Click your file
  2. Select Send to
  3. Choose the Compressed (zipped) folder option

Selecting the Compressed (zipped) folder, PowerPoint will compress your presentation as much as possible as pictured below.

Shows the status bar of compressing a file to the ZIP file format

How much room you will save depends on what is your presentation and how much PowerPoint can compress it (not nearly the space savings as the other methods).

To uncompress a ZIP folder, right-click it in File Explorer and select Extract All

To uncompress a ZIP folder back into a PowerPoint file, simply:

  1. Right-Click your ZIP folder
  2. Select Extract All…
  3. Choose a File Location to extract yoru ZIP folder too
  4. Select Extract

Extracting your file turns your ZIP folder into a normal folder with your original - Non-Compressed - PowerPoint file.

What’s next?

Updated on May 19, 2019

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