PPT is the legacy binary format from PowerPoint 97-2003, using OLE2 compound document structure to store slides, animations, and media in a single binary stream. PPTX is the modern format introduced with Office 2007 — a ZIP archive of XML files following the Office Open XML standard. Converting PPT to PPTX upgrades your presentation from a proprietary binary to a modern, standards-based format with broader compatibility and richer features.

PPTX is the standard presentation format for all modern software. Microsoft PowerPoint, Google Slides, Apple Keynote, LibreOffice Impress, and every web-based presentation tool imports PPTX natively. PPT files, while still openable, trigger compatibility mode warnings and may render differently in modern software. Converting PPT to PPTX ensures full compatibility with current tools.

PPTX also provides technical advantages: ZIP compression reduces file size (often by 50-70%), the XML internals are self-documenting and recoverable, and the format supports modern features like SmartArt, theme-based styling, advanced animations (morph, 3D), and high-resolution media embedding. Upgrading to PPTX unlocks these features for further editing.

LibreOffice opens the PPT binary by parsing the OLE2 compound file structure, reading slide records, text runs, drawing objects, and animation sequences. The presentation model is then serialized as PPTX — a ZIP archive containing PresentationML XML files. Each slide becomes a ppt/slides/slideN.xml file, shapes are expressed as DrawingML <a:sp> elements, text runs use <a:r> formatting, and images are stored in ppt/media/. PPT animation sequences are mapped to PPTX timing XML where equivalents exist. The output includes a proper [Content_Types].xml, relationships files, and slide layout/master references.

Very close. Standard content transfers with high fidelity. Minor differences may appear in legacy drawing objects, embedded OLE content, and some custom animations.

Usually decreases by 30-60% because PPTX uses ZIP compression while PPT stores data uncompressed.

No. PPTX does not support VBA macros — that requires PPTM format. If macros are critical, convert to PPTM instead.

Yes, but any PPTX-specific features you add after conversion (SmartArt, modern animations) will be lost in the reverse conversion.

Yes, unless a specific system requires PPT. PPTX is smaller, more compatible, and better supported by all modern software.

Device	PPT	PPTX
Windows PC	Partial	Partial
macOS	Partial	Partial
iPhone/iPad	Partial	Partial
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No	No

Χαρακτηριστικό	PPT	PPTX
Πλήρες όνομα	Microsoft PowerPoint 97-2003	Microsoft PowerPoint Presentation
Επέκταση	.ppt	.pptx
Ιδανικό για	Legacy support	Presentations

Convert PPT to PPTX — Free Online Converter

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