What file extension is used to save an MS PowerPoint 2021 presentation?
.pptx
The native file format for saving a Microsoft PowerPoint 2021 presentation is .pptx. The trailing x signals the Office Open XML format, which Microsoft introduced with Office 2007 and has used ever since (including Office 2013, 2016, 2019, 2021 and Microsoft 365). This XML-based format stores the file as a compressed package of parts, which makes files smaller, more robust against corruption, and easier for other software to read than the older binary formats.
It helps to see the family of Office extensions together:
| Application | Modern extension | Older (pre-2007) extension |
|---|---|---|
| PowerPoint (presentations) | .pptx | .ppt |
| Word (documents) | .docx | .doc |
| Excel (spreadsheets) | .xlsx | .xls |
From this it is clear why the other options are wrong. The .docx extension belongs to Word documents and .xlsx belongs to Excel workbooks, so neither is a PowerPoint file. The .pdf extension is a fixed-layout, cross-platform format used mainly for sharing and printing; while a PowerPoint file can be exported to PDF, that is not the format in which the editable presentation is saved. Hence the correct extension for a PowerPoint 2021 presentation is .pptx.
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