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PPTX is Microsoft PowerPoint’s default presentation format since PowerPoint 2007. It is a ZIP package that follows the Office Open XML standard (PresentationML): each slide is an XML part that relies on a slide layout, a slide master and a theme with colors and fonts. Charts are stored as native objects with their data.

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Why it matters when generating documents with AI

  • Slides that use the presentation’s layouts and theme keep the same look when someone adds more later.
  • A native chart can be edited in PowerPoint; a picture of a chart cannot.
  • Text does not shrink to fit its box by itself: if it is long, it overflows, a common failure when a model writes the content.
  • Shapes off the slide, empty placeholders or text that is too small make a deck look careless even if the file is valid.

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With Doconda

With format: "pptx", Doconda creates a 16:9 presentation with native charts and a theme that slides you add will follow, plus its PDF (Create). If you pass your own presentation, it is used as the template. When reviewing, it detects and fixes text overflowing its box, shapes off the slide and empty placeholders.