PDF is a file format that is widely used for sharing documents on different platforms. It is a popular choice for businesses, educational institutions and individuals. After you have created a Word document, you may need to convert it to PDF in many cases. This article will focus on how to convert Word to PDF in C# using a .NET Word library.

• Convert Doc or Docx to PDF

• Convert Word to Password-Protected PDF

Install the Library

Before we begin, you will need to download Spire.Doc for .NET from the link or follow the below steps to install it via NuGet:

1. Open Visual Studio and create a new project.

2. Right-click on the project in the Solution Explorer and select “Manage NuGet Packages”.

3. Search for “Spire.Doc” and install the latest version.

Convert a Doc or Docx Document to PDF

With only three lines of code, we can easily convert a .doc/.docx document to PDF with C#. First we need to create an instance of Document class and load an input Word document. Then we can convert the document to PDF using the Document.SaveToFile(string fileName, FileFormat.PDF) method.

Sample Code:

using Spire.Doc;

namespace ToPDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Document object
            Document document = new Document();

            //Load a sample Word document
            document.LoadFromFile("REPORT.docx");

            //Save the document to PDF
            document.SaveToFile("ToPDF.pdf", FileFormat.PDF);
        }
    }
}

Convert Word to Password-Protected PDF

During conversion, we are also allowed to set both open password and permission password for the output PDF document and encrypt it using the ToPdfParameterList.PdfSecurity.Encrypt() method.

Sample Code:

using Spire.Doc;

namespace ToPDFWithPassword
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Document object
            Document document = new Document();

            //Load a sample Word document
            document.LoadFromFile("REPORT.docx");

            //Create a ToPdfParameterList instance
            ToPdfParameterList parameters = new ToPdfParameterList();

            //Set open password and permission password for PDF
            string openPsd = "123";
            string permissionPsd = "abc";
            parameters.PdfSecurity.Encrypt(openPsd, permissionPsd, PdfPermissionsFlags.Default, PdfEncryptionKeySize.Key128Bit);

            //Save the Word document to PDF with password
            document.SaveToFile("ToPDFWithPassword.pdf", parameters);
        }
    }
}

In addition to the above two examples, Spire.Doc for .NET is also capable of converting Word to PDF with bookmarks, with fonts embedded or set image quality. Check the below link for a comprehensive guide:

https://www.e-iceblue.com/Tutorials/Spire.Doc/Spire.Doc-Program-Guide/How-to-Convert-Word-to-PDF.html

Other Conversion Features Supported by the .NET Word API:

Convert Word to Images (JPG, PNG and SVG) in C#/VB.NET

Convert Word to Excel in C#/VB.NET

Convert Word to XPS in C#/VB.NET

Convert Text to Word or Word to Text in C#/VB.NET