or click to choose. .ppsx, .potx and .pptm work too.
Add a presentation to shrink it. You’ll see every picture that was resized and how much each one saved.
Compressed entirely in your browser. Your presentations are never uploaded.
This PPTX compressor makes PowerPoint files smaller by doing what PowerPoint’s own “Compress Pictures” does, but for every picture at once: it shrinks each image to the size it’s actually shown on the slide, re-saves photos efficiently, and repacks the file. A 50 MB deck full of phone photos often drops to 5–10 MB with no visible difference. Text, animations, transitions and layouts aren’t touched, and nothing is uploaded.
How to compress a PowerPoint file
- Drop your
.pptxfile onto the left box, or click it to choose one. Several files at once is fine. - Pick a picture quality. Screen looks sharp on monitors and projectors and suits most decks.
- Compression starts right away. The results list every picture that was resized, with its old and new size.
- Click Download and open the new file in PowerPoint, Keynote or Google Slides as usual.
Which picture quality should I choose?
| Setting | Best for | Typical result |
|---|---|---|
| Email (96 ppi) | Attachments, uploads with size limits, decks people view on laptops | Smallest file. Fine on screen, soft if projected large or zoomed in. |
| Screen (150 ppi) | Presenting on monitors, TVs and projectors | Looks the same as the original on screen at a fraction of the size. |
| Print (220 ppi) | Printed handouts and decks people zoom into | Keeps detail for print. Still a big saving if pictures came from a phone or camera. |
| Lossless only | When pictures must stay untouched | Only repacks the file and removes unused media. Usually 0–10% smaller. |
“ppi” means pixels per inch of the picture as it appears on the slide. A photo stretched across a 13-inch slide needs about 2,000 pixels at 150 ppi. A 12-megapixel phone photo has 4,000. The extra pixels add megabytes but nothing you can see.
What the compressor changes
- Resizes oversized pictures to the size they’re displayed, based on the largest place each one is used. Cropped pictures keep enough resolution for the visible part.
- Re-saves JPEG photos at an efficient quality, and only keeps the new version if it’s actually smaller.
- Converts photos saved as PNG or BMP to JPEG, which is often 5–10 times smaller. Screenshots, diagrams and logos with flat colors stay PNG so text and edges stay crisp, and PNGs with transparency are never converted.
- Removes unused media: pictures left behind after you deleted or replaced them on a slide.
- Repacks the file with maximum compression for the slide XML.
Videos, audio, embedded fonts, GIF animations and vector graphics (EMF, WMF and SVG) are left exactly as they are. If a video is what makes your deck big, the results tell you, so you can compress it separately or link to it instead.
Is it private?
Yes. Your presentation is opened and rebuilt inside your browser. Nothing is uploaded, which makes this safe for client decks, financials and anything under NDA. The original file on your computer is never changed.
Frequently asked questions
Will my animations, transitions and fonts survive?
Yes. Only the picture files inside the presentation change. Slides, text, animations, transitions, notes, charts, tables and embedded fonts are copied over untouched.
Why did my file barely shrink?
The pictures were probably already small, or the size comes from videos, audio or embedded fonts, which this tool doesn’t change. The results show the biggest items that couldn’t be shrunk.
Can I undo it?
Resized pictures can’t be restored to full resolution in the compressed copy, so keep your original file. The compressor never changes the original, it creates a new one.
Does this work with Keynote or Google Slides files?
It works with PowerPoint formats: .pptx, .ppsx, .potx and macro-enabled .pptm. To shrink a Keynote or Google Slides deck, export it as .pptx first.
How is this different from PowerPoint’s Compress Pictures?
It’s the same idea, but it handles every picture in the deck in one go, including pictures on layouts and masters, converts bloated PNG photos to JPEG, removes unused media, and shows you exactly what changed.