Compress PowerPoint presentations
Shrink PPTX decks by recompressing their photos. Slides, animations and notes stay as they are.
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How to compress PowerPoint (PPTX) files
Add your files
Drop files on the box, paste them or choose them from your device. Nothing is uploaded.
Check the settings
The default preset suits most files. Change quality, size or format if you need a smaller file.
Download the result
Save each file or all of them as one ZIP. If a file cannot get smaller, you keep the original.
Why presentations are the heaviest office files
A PPTX presentation, the PowerPoint format since 2007, is a ZIP archive of XML files, one per slide, plus layouts, masters, themes and a ppt/media folder. Slides are built from pictures far more than documents are: full-bleed photos as backgrounds, screenshots, product shots, logos on every layout, and increasingly video and audio. A deck of 40 slides with a large photo on each easily reaches 100 MB or more when the photos come straight from a camera.
The screen it is shown on sets the useful limit. A 1920 × 1080 projector or monitor shows about 2 million pixels across the whole slide; a full-slide background from a 24-megapixel camera has nearly twelve times that.
How the PowerPoint compressor works
- Pictures in
ppt/mediaare downscaled to the chosen resolution for the size they appear at on the slide, and JPEGs are re-encoded at your chosen quality. - Photo-like PNGs without transparency become JPEG, with every slide, layout and master updated to the new file name. Transparent PNGs stay PNG, so logos and cut-out images stay clean on any background.
- By default the preview picture of the first slide is dropped; removing embedded fonts is an extra option.
- The presentation is repacked with maximum ZIP compression.
Slides, text, animations, transitions, speaker notes and slide masters are not changed. Video and audio clips embedded in the presentation are copied unchanged; to shrink those, see the next section. The tool also accepts .pptm files with macros and OpenDocument .odp presentations.
Settings for different uses
| Use | Picture settings |
|---|---|
| Sending the deck by email | Recommended: 150 DPI, quality 75 |
| Uploading to a course platform or conference portal | Strong: 96 DPI, quality 60; check the platform's limit first |
| Presenting on a 4K screen | Custom: 300 DPI, quality 80, for sharp full-slide photos |
| Printing handouts | Recommended is enough; handouts print slides small |
Large videos inside a presentation
If ppt/media contains MP4 or MOV files, they are usually the biggest part of the deck. In PowerPoint for Windows, File › Info › Compress Media converts them to 1080p, 720p or 480p. Alternatively, compress the video with our MP4 compressor and insert it again, or upload it to a video platform and link to it from the slide.
Size controls inside PowerPoint
- Picture Format › Compress Pictures, with "Delete cropped areas of pictures" and a target resolution. Uncheck "Apply only to this picture" to process the whole deck.
- File › Options › Advanced › Image Size and Quality sets the default resolution and has "Discard editing data", which removes the information PowerPoint keeps to undo picture edits.
- Unused slide layouts and masters in templates can carry large background images. Delete the ones you do not use in View › Slide Master.
- Insert photos as files rather than pasting them, which can add a copy in another format.
PowerPoint questions
Will my animations and transitions still work?
Yes. Only the image files are recompressed; slide XML, timing and effects are untouched.
Does the result open in Google Slides and Keynote?
The result is still a standard PPTX in which only the picture data has changed, and the tool checks its structure before offering it, so it should open wherever the original opened.
Why did my presentation hardly shrink?
Most likely its size comes from embedded video or audio, or its pictures were compressed already. Check the media folder by renaming a copy to .zip and opening it.
Is PDF a better format for sending slides?
For reading, often yes: it is smaller and opens everywhere, but animations and embedded video are lost. Export to PDF and use the PDF compressor if the recipient does not need to present.
What about .ppt files?
The PowerPoint 97–2003 format is different inside. The PPT page explains the options for it.
More tools
Use the Word compressor for documents and the document compressor for any office file. How it works describes why presentations with unpublished material stay on your device.