Why is my PowerPoint file so large?
- Photos keep their original pixels: a 12 MP photo is 2–5 MB, and a deck can hold dozens.
- Cropped areas are kept so the crop can be undone.
- Videos and audio are embedded in the file; a minute of 4K phone video can be several hundred megabytes.
- Editing data (the original of a recolored or retouched picture) is stored alongside the edited one.
How do I compress all pictures in PowerPoint?
- Click any picture on any slide.
- On the Picture Format tab, select Compress Pictures.
- Clear Apply only to this picture so the whole presentation is processed.
- Tick Delete cropped areas of pictures.
- Under Resolution, pick Web (150 ppi) for screens and projectors, or Print (220 ppi) for handouts and very large displays. Click OK.
- Save, or use File > Save a Copy to keep the original at full quality.
Pixels kept by a picture that fills the width of a 16:9 slide (13.33 inches). Smaller pictures keep proportionally fewer.
| Resolution option | Pixels across a full-width picture | Good for |
|---|---|---|
| High fidelity | Original, no downsampling | Zooming into photos, very large screens |
| HD (330 ppi) | About 4,400 | 4K displays, printed slides |
| Print (220 ppi) | About 2,930 | Handouts, large screens |
| Web (150 ppi) | About 2,000 | Projectors, Teams and Zoom, sharing |
| E-mail (96 ppi) | About 1,280 | Smallest file, quick previews |
File size roughly follows the pixel count. A 4032 × 3024 photo across a full slide is about 300 ppi, so HD (330 ppi) leaves it as is; Print (220 ppi) removes about half its pixels and Web (150 ppi) about three quarters. Pictures that only fill part of a slide shrink even more.
How do I make PowerPoint stop storing full-size images?
On Windows, go to File > Options > Advanced > Image Size and Quality. Tick Discard editing data, make sure Do not compress images in file is not ticked, and set Default resolution to 150 or 220 ppi. On a Mac, the Compress Pictures dialog offers a Picture Quality menu, Delete cropped areas of pictures, and a choice between selected pictures and all pictures in the file.
How do I compress videos in PowerPoint?
On Windows, go to File > Info and, in the Multimedia section, select Compress Media. Pick a quality and PowerPoint re-encodes every video and audio clip in the deck:
- Full HD (1080p): saves space while keeping overall quality.
- HD (720p): comparable to video streamed over the internet.
- Standard (480p): for when space is tight, such as sending by email.
Embedded subtitles and alternate audio tracks are lost. Compress Media is not available in PowerPoint for Mac or on the web: on a Mac, shrink the clip before inserting it, for example with QuickTime Player's File > Export As > 1080p or 720p. Moving a 4K clip down to 1080p or 720p is usually where the largest savings in a deck come from.
Should I compress photos before inserting them?
For photo-heavy decks, yes: you choose the quality once and PowerPoint never stores the originals. In the compressor, turn on Limit width at 2000 px (a full slide at 150 ppi), keep quality around 75–80 and drop the whole batch; screenshots stay PNG with a reduced palette, photos stay JPG. It runs in the browser, so slides with confidential pictures are never uploaded.
Sending the deck as a PDF instead? See reduce PDF size with images. The same picture settings work in Word, and folders of photos are covered in bulk compress images.