Convert PPTX to PPT in C#

Overview

This article explains how to convert PowerPoint Presentation in PPTX format into PPT format using C#. The following topic is covered.

• Convert PPTX to PPT in C#

C# Convert PPTX to PPT

For C# sample code to convert PPTX to PPT, please see the section below i.e. Convert PPTX to PPT. It just loads the PPTX file and saves in PPT format. By specifiying different save formats, you can also save PPTX file into many other formats like PDF, XPS, ODP, HTML etc. as disscussed in these articles.

• C# Convert PPTX to PDF
• C# Convert PPTX to XPS
• C# Convert PPTX to HTML
• C# Convert PPTX to ODP
• C# Convert PPTX to Image

Convert PPTX to PPT

To convert a PPTX to PPT simply pass the file name and save format to the Save method of Presentation class. The C# code sample below converts a Presentation from PPTX to PPT using default options.

// Instantiate a Presentation object that represents a PPTX file
Presentation pres = new Presentation("presentation.pptx");

// Saving the PPTX presentation to PPT format
pres.Save("presentation.ppt", SaveFormat.Ppt);

FAQ

Do all PPTX effects and features survive when saving to the legacy PPT (97–2003) format?

Not always. The PPT format lacks some newer capabilities (e.g., certain effects, objects, and behaviors), so features may be simplified or rasterized during conversion.

Can I convert only selected slides to PPT instead of the entire presentation?

Direct saving targets the whole presentation. To convert specific slides, create a new presentation with just those slides and save it as PPT; alternatively, use a service/API that supports per-slide conversion parameters.

Are password-protected presentations supported?

Yes. You can detect whether a file is protected, open it with a password, and also configure protection/encryption settings for the saved PPT.