PPTX vs PPT: Which PowerPoint Format to Use

PPTX vs PPT: Key Differences

Microsoft PowerPoint uses two formats: the modern PPTX (since Office 2007) and the legacy PPT (Office 2003 and earlier). Understanding the differences helps you choose the right format for your audience.

Format Structure

PPTX is a ZIP archive containing XML files, images, and media. You can rename it to .zip and inspect its contents in any file manager.

PPT uses the binary Compound File Binary Format (OLE2 container) — a complex proprietary structure that cannot be opened without specialised tools.

Compatibility

PPTX opens in: PowerPoint 2007+, LibreOffice Impress, Google Slides, Keynote, WPS Office, Microsoft 365 (web). Universally supported.

PPT opens in: All versions of PowerPoint (97 through 2021), LibreOffice Impress. Less support in web apps and mobile apps.

Features

PPTX supports all modern PowerPoint features: SmartArt, newer transition effects, co-authoring, Office 365 add-ins, and content controls.

PPT supports all features up to Office 2003. Missing modern animation types and Office 365-specific features.

File Size

PPTX is generally smaller for the same content because the ZIP compression reduces XML overhead significantly.

PPT binary format can be larger for the same presentation due to less efficient storage.

When to Use PPTX

Use PPTX for all new presentations. It is the current standard, supported everywhere, and has no disadvantages compared to PPT for modern use.

When to Use PPT

Use PPT only when: the recipient specifically requires PPT, they are using PowerPoint 2003 or earlier (extremely rare), or the presentation contains VBA macros that were written for the PPT format.

Recommendation

Always create and save in PPTX. If sharing with someone who claims they need PPT, ask them to verify — virtually all modern PowerPoint installations open PPTX natively.