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What is it
PPTX is Microsoft PowerPoint's default presentation format — an XML-based container that supports slides, animations, embedded media, and speaker notes. Death by PowerPoint is a real phenomenon. This is the murder weapon. PPTX has been the default since 2007, and it carries the weight of every quarterly review, thesis defence, and wedding toast ever projected onto a wall. Under the hood, it is the same XML-in-a-ZIP structure as DOCX and XLSX. Files get bloated fast — a deck with stock photos can easily hit 100 MB. For sharing, PDF is usually a better choice. For presenting, PPTX is the standard everyone expects.
Technical details
Safety
What opens it
Microsoft PowerPoint
Google Slides
LibreOffice Impress
Apple Keynote
FAQ
How do I open a PPTX file without PowerPoint?
Google Slides opens PPTX files in your browser with decent fidelity. LibreOffice Impress (free) and Apple Keynote also handle PPTX. Animations and custom fonts may not survive the conversion, but the content and layout generally do.
Should I share a PPTX or PDF?
PDF if the audience only needs to view it — the layout stays locked on every device. PPTX if they need to edit or present it. A common move: send the PDF for reading, keep the PPTX for the meeting.
How do I reduce the file size of a PPTX?
The usual culprit is uncompressed images. In PowerPoint, use File → Compress Pictures to downsample embedded images. You can also delete unused slide masters, remove embedded fonts, and export videos at lower resolution. Dropping from 100 MB to 10 MB is common.
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