How to change the PDF properties using C# and VB.NET
Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can change the document information of a PDF like author, creation date, subject, title, and producer using C# and VB.NET.
Steps to change PDF properties programmatically:
- Create a new C# console application project.
- Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.
- Include the following namespaces in the Program.cs file.
C#
using Syncfusion.Pdf.Parsing;
VB.NET
Imports Syncfusion.Pdf.Parsing
- Use the following code snippet to change PDF properties.
C#
//Load the PDF document
PdfLoadedDocument document = new PdfLoadedDocument("Input.pdf");
//Modify the document information
document.DocumentInformation.Author = "Syncfusion";
document.DocumentInformation.CreationDate = DateTime.Now;
document.DocumentInformation.Creator = "Essential PDF";
document.DocumentInformation.Keywords = "PDF";
document.DocumentInformation.Subject = "Document information DEMO";
document.DocumentInformation.Title = "Essential PDF Sample";
document.DocumentInformation.ModificationDate = DateTime.Now;
document.DocumentInformation.Producer = "Syncfusion PDF";
//Save the document
document.Save("DocumentInformation.pdf");
//Close the document
document.Close(true);
//This will open the PDF file so, the result will be seen in default PDF viewer
System.Diagnostics.Process.Start("DocumentInformation.pdf");
VB.NET
'Load the PDF document
Dim document As New PdfLoadedDocument("Input.pdf")
'Modify the document information
document.DocumentInformation.Author = "Syncfusion"
document.DocumentInformation.CreationDate = DateTime.Now
document.DocumentInformation.Creator = "Essential PDF"
document.DocumentInformation.Keywords = "PDF"
document.DocumentInformation.Subject = "Document information DEMO"
document.DocumentInformation.Title = "Essential PDF Sample"
document.DocumentInformation.ModificationDate = DateTime.Now
document.DocumentInformation.Producer = "Syncfusion PDF"
'Save the document
document.Save("DocumentInformation.pdf")
'Close the document
document.Close(True)
'This will open the PDF file so, the result will be seen in default PDF viewer
System.Diagnostics.Process.Start("DocumentInformation.pdf")
A complete working sample can be downloaded from PDFPropertiesSample.zip.
By executing the program, you will get the output document PDF properties as follows. 
Take a moment to peruse the documentation, where you can find options like set PDF document information, read, and modify the document properties of an existing PDF document and features like adding XMP metadata, custom schema, and custom metadata to the PDF document and removing custom metadata from PDF.
Refer here to explore the rich set of Syncfusion Essential PDF features.
Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.
