PowerPoint Presentation — Microsoft PowerPoint presentation based on Office Open XML.
Quick facts
What is .pptx
A .pptx file is a PowerPoint Presentation — Microsoft PowerPoint presentation based on Office Open XML.
In the mime-db registry it maps to application/vnd.openxmlformats-officedocument.presentationml.presentation, and it is marked as non-compressible. When serving .pptx over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to application/vnd.openxmlformats-officedocument.presentationml.presentation — and is delivered over HTTP via the Content-Type header.
How to open .pptx files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: application/vnd.openxmlformats-officedocument.presentationml.presentation
Common software that reads/writes .pptx:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .pptx files
How to create .pptx files
Frequently asked questions
Common options include Microsoft PowerPoint, LibreOffice. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .pptx extension.
application/vnd.openxmlformats-officedocument.presentationml.presentation is the media type identifier used for .pptx files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
Explore this reference