最終更新日: 2026年4月13日
はじめに If you’ve ever worked with PowerPoint presentations, you’ve likely come across file extensions like PPT, PPTX, and PPSX. While they may seem similar at first glance, each format serves a unique purpose and is optimized for different use cases. Understanding the differences between these formats is essential—not just for everyday users, but also for developers, content creators, and businesses aiming to streamline their presentation workflows.
In this guide, we’ll break down each format in detail, compare their features, and help you decide when to use PPT, PPTX, or PPSX for maximum efficiency.