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You have a presentation to give, review, or dread. It's a PPTX. Death by PowerPoint is a real phenomenon, and this is the file format that makes it possible — every quarterly review, thesis defence, and wedding toast ever projected onto a wall.
PPTX follows the same pattern as DOCX and XLSX — it's XML files inside a ZIP archive. The format supports slides, animations, transitions, embedded video, speaker notes, and master templates. Files get bloated fast: a deck with stock photos can easily hit 100 MB because PowerPoint embeds full-resolution images even when they're displayed at thumbnail size. If someone sends you a 200 MB PPTX, it's not because their ideas are big — it's because they didn't compress their images.
PowerPoint (subscription) opens everything perfectly. Google Slides is free and handles most formatting. LibreOffice Impress is free but occasionally stumbles on complex animations and custom fonts. For sharing a presentation you don't want edited, export to PDF. For presenting, PPTX is what the projector expects.