C#/VB.NET: Change PDF Version

When uploading or submitting PDF files on certain platforms, you are sometimes faced with the dilemma that the platforms require a specific version of PDF file. If your PDF files fail to meet the requirements, it is necessary to convert them to a different version for compatibility purposes. This article will demonstrate how to programmatically convert PDF between different versions using Spire.PDF for .NET.

Install Spire.PDF for .NET

To begin with, you need to add the DLL files included in the Spire.PDF for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.

PM> Install-Package Spire.PDF

Change PDF Version in C# and VB.NET

Spire.PDF for .NET supports PDF versions from 1.0 to 1.7. To convert a PDF file to a newer or older version, you can use the PdfDocument.FileInfo.Version property. The following are the detailed steps.

• Create a PdfDocument object.
• Load a sample PDF file using PdfDocument.LoadFromFile() method.
• Change the PDF version to a newer or older version using PdfDocument.FileInfo.Version property.
• Save the result document using PdfDocument.SaveToFile() method.

using Spire.Pdf;

namespace ConvertPDFVersion
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument pdf = new PdfDocument();

            //Load a sample PDF file
            pdf.LoadFromFile("sample.pdf");

            //Change the PDF to version 1.7
            pdf.FileInfo.Version = PdfVersion.Version1_7;

            //Save the result file
            pdf.SaveToFile("PDFVersion.pdf");
        }
    }
}

Imports Spire.PDF

Namespace ConvertPDFVersion
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim pdf As PdfDocument = New PdfDocument

            'Load a sample PDF file
            pdf.LoadFromFile("sample.pdf")

            'Change the PDF to version 1.7
            pdf.FileInfo.Version = PdfVersion.Version1_7

            'Save the result file
            pdf.SaveToFile("PDFVersion.pdf")
        End Sub
    End Class
End Namespace

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.