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Easily Convert Color PDF to Grayscale in C# and VB.NET


Converting PDF to grayscale allows people to print the PDF in a cheaper mode without consuming colored ink. In this article, I will illustrate how to convert a color PDF to grayscale easily with only 2 lines of code in C# and VB.NET using a free library – Free Spire.PDF for .NET.

Add Reference

You can either download Free Spire.PDF DLLs from this website or install Free Spire.PDF using NuGet Package Manager through the following steps:

  • In your project’s Solution Explorer, right-click the project or “Dependencies” and select “Manage NuGet Packages”.
  • Click “Browse” tab and search Free Spire.PDF.
  • Install Free Spire.PDF.

Input PDF









Converted PDF



Convert PDF to Grayscale in C# and VB.NET

The PdfGrayConverter.ToGrayPdf(string) method is used for converting PDF to grayscale.

C# Code

The following example shows how to convert a PDF to grayscale in C# code.

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using Spire.Pdf.Conversion;
 
namespace ConvertPdfToGrayscale
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfGrayConverter instance and load a PDF file
            PdfGrayConverter converter = new PdfGrayConverter(@"Sample.pdf");
            //Convert the PDF to grayscale
            converter.ToGrayPdf("Grayscale.pdf");
            converter.Dispose();
        }
    }
}

VB.NET Code

The following example shows how to convert a PDF to grayscale in VB.NET code.

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Imports Spire.Pdf.Conversion
 
Namespace ConvertPdfToGrayscale
    Class Program
        Private Shared Sub Main(ByVal args As String())
            Dim converter As PdfGrayConverter = New PdfGrayConverter("Sample.pdf")
            converter.ToGrayPdf("Grayscale.pdf")
            converter.Dispose()
        End Sub
    End Class
End Namespace

That’s all. I hope it’s helpful for you. Happy coding!

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