How to open .PPSX files on Mac
To open .PPSX files on Mac, open the .ppsx file with Microsoft PowerPoint for Mac; it should start in Slide Show mode.
Step-by-step instructions
- Open the .ppsx file with Microsoft PowerPoint for Mac; it should start in Slide Show mode.
- If you want to edit, open it from inside PowerPoint (File > Open) so you can switch out of Slide Show view.
Common issues
It opens as a slide show and I can’t edit
.ppsx is meant for playback, so PowerPoint opens it directly in Slide Show mode rather than the editor.
- Open Microsoft PowerPoint first, then use File > Open to open the .ppsx.
- Exit Slide Show view to return to the normal editing interface; if needed, save a copy in an editing-focused format (such as .pptx) for future changes.
The file doesn’t open because the app isn’t installed
.ppsx is a PowerPoint-specific OOXML slideshow; without Microsoft PowerPoint (or an environment that supports this OOXML variant), opening may fail.
- Install Microsoft PowerPoint or open the file on a machine that has PowerPoint available.
- If you must share with someone without PowerPoint, open it in PowerPoint and export/share in a format they can view.
A website/upload rejects the file type
Some systems validate by MIME type or an allow-list of extensions; .ppsx may be blocked even though it is a standard OOXML media type.
- If there is a file-type setting, choose the PowerPoint slideshow type or allow the MIME type application/vnd.openxmlformats-officedocument.presentationml.slideshow.
- As a workaround for upload systems that only allow .pptx, open in PowerPoint and save a copy in a permitted format.
Security note
.ppsx is designed to auto-start as a slide show in PowerPoint, so content begins running immediately on open; treat unexpected .ppsx files as higher risk than a file that opens in an editor first.