PPTX file format
PPTX is the PowerPoint format since Office 2007. It carries slides, speaker notes, media and animations — and turns into a PDF the moment you need to share it safely.
or drag & drop them here · images, video, audio and documents · up to 2 GB
What is PPTX?
PPTX is the presentation member of the Office Open XML family: a ZIP archive holding one XML file per slide, plus a media folder with every image, video and sound you inserted. That structure makes it far lighter than the old binary PPT and lets other software — Google Slides, Keynote, LibreOffice Impress — open decks reliably.
Because media lives inside the package, PPTX files grow fast. A deck with a few high-resolution photographs and an embedded video easily passes 100 MB, which is what usually collides with email attachment limits. Compressing images inside PowerPoint before sending, or exporting to PDF, is the standard fix.
A PDF export is the safe way to hand a deck to someone who only needs to read it: layout and fonts are locked, and nothing can be accidentally edited. What you give up is everything time-based — animations, slide transitions, embedded video and audio all flatten into static pages, and speaker notes are omitted unless you deliberately choose a notes layout.
| Extension | .pptx |
|---|---|
| Category | Document |
| MIME type | application/vnd.openxmlformats-officedocument.presentationml.presentation |
| Released | 2007 |
| Developed by | Microsoft |
| Compression | Lossless |
PPTX: frequently asked questions
- Why is my PPTX file so large?
- Embedded media. Every image is stored at full resolution and every video is copied into the package, so a handful of camera photographs can outweigh all the text a hundred times over. PowerPoint's built-in image compression usually cuts the file size dramatically.
- What happens to animations when I convert to PDF?
- They disappear. PDF pages are static, so transitions, entrance effects and any motion are lost, and elements animated to appear in sequence are all rendered at once. If the build order matters, split it across separate slides before exporting.
- Do speaker notes survive a conversion?
- Not by default. A standard PDF export writes the slides only. To keep notes you have to export using a notes-page layout, which places each slide above its notes — worth doing when the deck is being handed to someone who will present it.
- Can I open PPTX without PowerPoint?
- Yes. Google Slides, LibreOffice Impress, Apple Keynote and WPS Office all read PPTX. Simple decks transfer perfectly; complex animations, SmartArt and custom transitions are where rendering starts to differ between applications.
- Why do fonts change when I open a deck elsewhere?
- Because PPTX references fonts by name rather than embedding them. A machine without your typeface substitutes something else, which shifts text boxes and can push lines off slides. Embedding fonts on save, or exporting to PDF, prevents it.
- PPTX or PDF for sharing a presentation?
- PDF whenever the recipient only needs to read it — nothing shifts, nothing needs PowerPoint, and the file is much smaller. Send PPTX only when they must edit the deck or actually present it with the animations intact.