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PowerPoint conversion

Convert PPT and PPTX in .NET

Modernize PowerPoint 97–2003 PPT presentations or create supported PPT output from PPTX with feature-level conversion diagnostics.

Get OfficeIMO.PowerPoint Check PowerPoint compatibility
PPT and PPTX summary
Input
PPT
Output
PPTX
Runs on
.NET on Windows, Linux, and macOS
Microsoft Office
Not required
License
MIT

Legacy and modern PowerPoint formats differ. Review diagnostics for masters, media, charts, animation, embedded objects, and drawing effects.

Explore all conversion guides

Practical steps

Convert PPT to PPTX with OfficeIMO.PowerPoint

Analyze a legacy presentation and create a modern PPTX file without PowerPoint automation.

  1. InstallAdd the OfficeIMO.PowerPoint NuGet package.
  2. AnalyzeReview slide, shape, media, chart, and preservation findings.
  3. ConvertCall PowerPointPresentation.Convert for the PPT and PPTX paths.
  4. ReviewValidate the slides important to the presentation workflow.

OfficeIMO.PowerPoint handles legacy PPT, POT, and PPS files as well as modern PPTX, PPTM, POTX, and PPSX presentations. Applications can use the same conversion surface in services, desktop software, containers, and scheduled jobs without launching Microsoft PowerPoint.

PPT to PPTX

using OfficeIMO.PowerPoint;

PowerPointPresentationConversionReport preview =
    PowerPointPresentation.AnalyzeConversion("briefing.ppt", "briefing.pptx");

PowerPointPresentationConversionResult result =
    PowerPointPresentation.Convert("briefing.ppt", "briefing.pptx");

PPTX to PPT

using OfficeIMO.PowerPoint;

PowerPointPresentationConversionResult result =
    PowerPointPresentation.Convert("briefing.pptx", "briefing.ppt");

Slides contain more than text boxes. Masters, layouts, groups, charts, embedded objects, custom XML, animation, media, and drawing effects can cross format generations differently. The compatibility report makes those decisions visible and can block output when the selected policy does not allow the required fallback.

Use PPT to PPTX for archive modernization and continued editing. Use PPTX to PPT only for a real legacy consumer, and test the destination in that consumer when the deck is business-critical.

See PowerPoint compatibility and the PowerPoint guide for slide creation, editing, notes, charts, and image export.

Example source

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