Will my animations and transitions survive?

Yes. Slide structure, themes and animation settings are preserved. Only embedded images and media are candidates for re-encoding, and only when the tool can do it safely.

Is my presentation uploaded anywhere?

No. The PPTX is processed entirely within your browser. Neither the content nor the filename is transmitted or stored anywhere.

Why is my PPTX file so big?

High-resolution photos and full-screen screenshots are the usual cause. They live inside the package at their original size; re-encoding them is where the savings come from.

Does the output work in PowerPoint, Keynote and Google Slides?

The result is a standard .pptx package, so it opens in PowerPoint and imports into Keynote and Google Slides like any other deck.

Compress PowerPoint presentations — privately

Presentations are heavyweight because of photos, screenshots and media on the slides. This tool re-encodes embedded images and rebuilds the package — slide structure, themes and animations stay intact.

Open the PPTX compressor tool Runs entirely in your browser — files never leave your device.

What this tool does

The tool unpacks the PPTX package in your browser, identifies the media that dominates its size, re-encodes images where it is safe to do so, and rebuilds the presentation package. Your slide order, masters, transitions and animations are preserved.

Media is only re-encoded when it can be done safely; anything the tool is not sure about is left untouched and mentioned in per-file warnings.

How to shrink a PPTX without uploading it

Add the deck. Drop your .pptx into the home-page tool.
Optimize. Embedded images are optimized and the package is rebuilt in your browser.
Download. Save the smaller deck and present as usual — it is a standard PowerPoint file.

Supported operations

This list is generated from CompressKit's capability registry — only implemented and tested operations appear here.

Optimize the file package

Optimize embedded images/media and rebuild the PPTX package, preserving slides and themes.
Inspect file details

Inspect the package to see what occupies the space.

Frequently asked questions

Will my animations and transitions survive?: Yes. Slide structure, themes and animation settings are preserved. Only embedded images and media are candidates for re-encoding, and only when the tool can do it safely.
Is my presentation uploaded anywhere?: No. The PPTX is processed entirely within your browser. Neither the content nor the filename is transmitted or stored anywhere.
Why is my PPTX file so big?: High-resolution photos and full-screen screenshots are the usual cause. They live inside the package at their original size; re-encoding them is where the savings come from.
Does the output work in PowerPoint, Keynote and Google Slides?: The result is a standard .pptx package, so it opens in PowerPoint and imports into Keynote and Google Slides like any other deck.

Ready to try it?

The PPTX compressor tool runs on this site with no upload step — your file is processed by your own browser and saved back to your device.

Open the PPTX compressor tool