How to Compress a PowerPoint: Pictures, Video and Fonts

Big decks cause real headaches. They bounce back from email, take ages to upload, lag on older laptops and fill up shared drives. Nine times out of ten, the culprit is a handful of huge photos or an embedded video, not the slides themselves.

PowerPoint has several built-in ways to slim a file down without wrecking how it looks. Here's each one from Microsoft's help, in the order I'd try them, along with the trade-offs worth knowing before you click.

What makes a PowerPoint file so large

Usually the cause	Built-in fix
High-resolution photos	Compress Pictures
Cropped pictures that still hold the hidden parts	Delete cropped areas of pictures
Saved editing history on images	Discard editing data
Embedded video and audio	Compress Media
Embedded fonts	Embed only the characters used

Start with pictures and media. They're almost always where most of the bulk lives. Phone photos are a common offender, because they go in at full size even when they only fill a corner of the slide. Work through the fixes below in order and check the file size after each one, so you know which change made the difference.

Compressing all the pictures in a PowerPoint at once

1. Click any picture in the presentation. The Picture Format tab appears.
2. In the Adjust group, select Compress Pictures.
3. Under Compression options, make sure Apply only to this picture is not ticked, so every picture is compressed.
4. Tick Delete cropped areas of pictures if you're happy to lose the trimmed-off parts.
5. Under Resolution, select Use default resolution, then select OK.

Be careful with that cropping box. Microsoft says the cropped data is removed for good and can't be restored. If you might want to re-crop a photo later, keep an untouched copy of the file.

Changing PowerPoint image settings to keep files small

To stop the file ballooning again, change the settings PowerPoint uses for every picture:

1. Go to File, then Options, then Advanced.
2. Under Image Size and Quality, tick Discard editing data.
3. Make sure Do not compress images in file is not ticked.
4. In the Default resolution list, choose 150ppi or lower.

The catch with discarding editing data is that you won't be able to return an edited image to its original state. For slides shown on screen, 150ppi or lower is usually plenty sharp. If you're printing a brochure from PowerPoint, you might keep a higher setting.

Compressing video and audio in a PowerPoint

Embedded video is the biggest file-size killer of all. On Windows, PowerPoint can shrink it for you:

1. Select the File tab, then Info.
2. In the Multimedia section, select Compress Media.
3. Choose a quality level from the list below.
4. Wait while PowerPoint compresses each clip, then save the file.

Option	What Microsoft says it's for
Full HD (1080p)	Saves space while keeping overall audio and video quality
HD (720p)	Comparable to video streamed over the internet
Standard (480p)	When space is tight, such as emailing the presentation

Two warnings. Microsoft says embedded subtitles and alternate audio tracks are lost when media is compressed. And Compress Media is only in PowerPoint for Windows, not on a Mac or in PowerPoint for the web.

Shrinking embedded fonts in a PowerPoint file

Embedding fonts keeps your design intact on other computers, but it adds weight. To keep it lean, go to File, Options, Save. Under Preserve fidelity when sharing this presentation, tick Embed fonts in the file and choose Embed only the characters used in the presentation.

If colleagues need to edit the slides using your custom fonts, Microsoft suggests Embed all characters instead. Just know it makes a larger file.

Zipping a PowerPoint to send it

If you've done all that and the file is still too big for an email, zip it. Microsoft says zipping a presentation shrinks the file while keeping the original quality. On Windows, right-click the file in File Explorer and look for the compress or zip option. Menu wording varies with your version of Windows.

For really big decks, I'd skip email altogether and share a link from OneDrive or another cloud drive instead. Nothing gets compressed and nobody hits an attachment limit.

If your PowerPoint is still too big after compressing

• Check for videos: a single embedded clip can outweigh every photo in the deck. Compress it or link to an online version instead.
• Look for hidden slides: old drafts tucked away still count towards the size.
• Replace screenshots: very large screenshots can be cropped down to the part you need.
• On a Mac or the web: Compress Media isn't available, so compress the video before inserting it.
• Save a copy: File, Save As with a new name sometimes produces a smaller file after a round of edits.

Preparing images before they go into PowerPoint

The best way to keep a deck small is to never put huge images in it. If you design graphics in Canva first, export them at the size you'll use. My guide to cropping in Canva helps trim photos to just the part that matters before they reach your slides.

GIFs are another sneaky source of bulk. If you're making animated graphics, creating a short GIF in Canva gives you a clip you can keep tight and simple, rather than dropping in a long, heavy file.

Frequently asked questions

How do I compress all pictures in PowerPoint at once?

Select any picture, go to Picture Format, Compress Pictures, and untick Apply only to this picture before choosing your resolution.

Will compressing a PowerPoint reduce quality?

It can. Microsoft says deleted cropped areas can't be restored, and media compression drops embedded subtitles and alternate audio tracks. Full HD (1080p) is the option Microsoft says keeps overall quality.

Can I compress video in PowerPoint for Mac?

No. Microsoft says Compress Media is available in PowerPoint for Windows, but not PowerPoint for Mac or PowerPoint for the web.

What resolution should I use to make a PowerPoint smaller?

Microsoft suggests choosing a default resolution of 150ppi or lower in File, Options, Advanced.

Does zipping a PowerPoint make it smaller?

Yes. Microsoft says zipping shrinks the file size while keeping the original quality of the presentation.