What is PPTX? PowerPoint File Format Explained

PPTX is the modern file format for Microsoft PowerPoint presentations. It replaced the older .ppt format starting with Office 2007.

How PPTX Files Work

A .pptx file is actually a ZIP archive containing XML files and media resources. Inside, you will find folders for slides, slide layouts, themes, and embedded media like images, audio, and video. This structure makes PPTX files smaller than old .ppt files and easier for software to read and modify.

PPTX vs PPT

The older .ppt format stored everything in a single binary file. PPTX uses open XML standards, which means other software (like Google Slides, LibreOffice Impress, and Keynote) can open and edit these files more reliably. PPTX files are also generally 30-50% smaller than equivalent .ppt files.

What Can You Store in a PPTX File?

A PPTX file can contain: slides with text, shapes, and formatting; embedded images (JPEG, PNG, GIF, SVG); audio and video files; charts and SmartArt graphics; animations and transitions; slide notes and comments; master slides and custom themes.

How SaveSlide Works with PPTX

Several SaveSlide tools work directly with PPTX files. The PPTX Image Compressor reduces embedded image sizes without changing your slides. The PPTX File Inspector shows you what is inside a PPTX file. The PDF to PPTX converter creates image-based PPTX files from PDF documents.