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To specify the output image size, set the Width and Height properties of the JpgViewOptions or PngViewOptions classes. Specify the value in pixels.

Note
GroupDocs.Viewer applies the aspect ratio automatically applied when you set the Width or Height value.

The following code snippet shows how to set the image width or height.

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

using (Viewer viewer = new Viewer("sample.docx"))
{
    // Create a JPG file.
    JpgViewOptions viewOptions = new JpgViewOptions();
    
    // Specify the width and height.
    viewOptions.Width = 600;
    viewOptions.Height = 800;
    
    viewer.View(viewOptions);
}

VB.NET

Imports GroupDocs.Viewer
Imports GroupDocs.Viewer.Options
' ...

Module Program
    Sub Main(args As String())
        Using viewer As Viewer = New Viewer("sample.docx")
            ' Create a JPG file.
            Dim viewOptions As JpgViewOptions = New JpgViewOptions()
        
            ' Specify the width and height.
            viewOptions.Width = 600
            viewOptions.Height = 800
        
            viewer.View(viewOptions)
        End Using
    End Sub
End Module

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