How to Compare PowerPoint Presentations

You may need to compare two versions of a PowerPoint Presentation to see the differences between them (e.g., if a colleague has edited it directly without noting the changes). And the quickest way to do this is with PowerPoint’s built-in Compare function. To use this:

  • Open the original version of your presentation
  • Go to Review > Compare
  • Click Compare to open a browser window
  • Select the edited version of the presentation and click Merge

You will then enter Review Mode. This will open the Reviewing Pane, which shows a list of all edits in the presentation at the right of the screen.

How to Compare Two Presentations using GroupDocs.Comparison

Such functionality that is provided by third-party programs is clearly not enough. GroupDocs.Comparison provides many features for comparing a wide range of supported file formats, including PowerPoint Presentation format. Let’s make an example, you made a presentation at different times, but the elements on the slides are not located as you originally did. To find where the slides differ, you can compare two files in PPTX format using the GroupDocs.Comparison functionality along with a built-in option that helps find changes in styles.


GroupDocs.Comparison provides the ability to compare two files in PPTX format(or any other supported file formats)

The following are the steps to compare two PPTX files.

The following code samples demonstrate how to compare two PPTX files.

string sourceDocumentPath = @"source_presentation.pptx"; // NOTE: Put here actual path to source document
string targetDocumentPath = @"target_presentation.pptx"; // NOTE: Put here actual path to target document
string outputPath = @"result_presentation.docx"; // NOTE: Put here actual path to result document       
using (Comparer comparer = new Comparer(sourceDocumentPath))
    CompareOptions compareOptions = new CompareOptions
        DetectStyleChanges = true,
        DetalisationLevel = DetalisationLevel.High
    comparer.Compare(outputPath, compareOptions);

As a result, we get a PPTX file where the deleted elements are marked in red, the added – in blue, and the modified – in green

Result Slide

More resources

Advanced Usage Topics

To learn more about document comparison features, please refer to the advanced usage section.

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to compare your DOC or DOCX, XLS or XLSX, PPT or PPTX, PDF, EML, EMLX, MSG and other documents with free to use online GroupDocs Comparison App.