Reduce image quality

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If the output PDF file contains images, you can reduce its size using image compression.

To enable image compression, set the CompressImages property to true. The GroupDocs.Viewer compresses all images in the file.

The ImageQuality property determines the compression ratio. It is a quality value in percent. 100% means original quality.

The following code snippet shows how to compress images in the file:

using GroupDocs.Viewer;
using GroupDocs.Viewer.Options;
// ...

using (var viewer = new Viewer("sample.docx"))
{
    PdfViewOptions viewOptions = new PdfViewOptions();
    viewOptions.PdfOptimizationOptions = new PdfOptimizationOptions
    {
        CompressImages = true,
        ImageQuality = 50
    };
     
    viewer.View(viewOptions);
}
Imports GroupDocs.Viewer
Imports GroupDocs.Viewer.Options
' ...

Module Program
    Sub Main(args As String())
        Using viewer = New Viewer("sample.docx")
            Dim viewOptions As PdfViewOptions = New PdfViewOptions()
            viewOptions.PdfOptimizationOptions = New PdfOptimizationOptions With {
                .CompressImages = True,
                .ImageQuality = 50
                }

            viewer.View(viewOptions)
        End Using
    End Sub
End Module

The following image demonstrates the result:

Reduce image quality

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