.PPTX

Introduction

PPTX is the default format of Microsoft PowerPoint since PowerPoint 2007, replacing the older binary .ppt. It is the presentation part of Office Open XML (ECMA-376 and ISO/IEC 29500): a ZIP archive with one XML part per slide, plus the layouts and masters the slides are built on, speaker notes, themes and media.

.pptm is the same layout with macros, and .potx a template.

Software

• Microsoft PowerPoint (Windows, macOS, web, mobile)
• LibreOffice Impress (Windows, macOS, Linux)
• Google Slides (web browsers)
• Apple Keynote (macOS, iOS)
• ONLYOFFICE (Windows, macOS, Linux, web)
• python-pptx (Python library)

Structure

ppt/presentation.xml lists the slides in order and sets the slide size. Each slide, such as ppt/slides/slide1.xml, is a tree of shapes holding text, pictures and charts. A slide is based on a layout in ppt/slideLayouts/, and each layout on a master in ppt/slideMasters/, so placeholders inherit their position and style. Relationship files next to each part link it to its layout, notes and media.