What is a .pptx file?
Microsoft PowerPoint Open XML Presentation · Document · Microsoft · 2007
PPTX is the PowerPoint presentation format: a zipped bundle of slides, text, images and animations. It is the standard for slide decks and opens in PowerPoint, Google Slides and LibreOffice Impress.
What is a .pptx file used for?
A PPTX holds each slide's layout, text, images, charts, transitions and speaker notes as compressed XML.
It replaced the binary PPT in 2007 and is now the shared language of slide decks across every major presentation app.
To share a deck that cannot be edited, people export it as a PDF.
How to open a .pptx file
The .pptx format opens in the following apps, grouped by operating system. If one app does not work, try another from the same list. For a step-by-step walkthrough, see how to open a .pptx file.
Windows
- PowerPoint
- LibreOffice Impress
- Google Slides
macOS
- PowerPoint
- Keynote
- LibreOffice Impress
Linux
- LibreOffice Impress
- OnlyOffice
- Google Slides
Web
- Google Slides
- Office on the web
How to convert a .pptx file
You can convert a .pptx file to PDF, PNG, JPG using a conversion tool or the export menu of an app that opens it.
.pptx file signature (magic bytes)
Programs recognise a .pptx file by the bytes at the start of the file, not by its name. These are the signatures for PPTX. For a full breakdown, see the PPTX file signature page.
| Hex signature | Offset | Note |
|---|---|---|
| 50 4B 03 04 | 0 | ZIP header (Office Open XML) |
See the full magic-numbers reference for every format.
Frequently asked questions
What is a .pptx file?
PPTX is the PowerPoint presentation format: a zipped bundle of slides, text, images and animations. It is the standard for slide decks and opens in PowerPoint, Google Slides and LibreOffice Impress.
How do I open a PPTX without PowerPoint?
Google Slides, LibreOffice Impress and Apple Keynote all open PPTX files. Export to PDF to share a view-only copy.