How to convert .Docx File to Pdf using Open source package?

I Need Free Library?

https://products.fileformat.com/word-processing/net/docx-to-pdf-converter/#:~:text=In%20order%20to%20convert%20DOCX,can%20convert%20DOCX%20to%20PDF.

https://www.gemboxsoftware.com/document/examples/c-sharp-convert-word-to-pdf/6007

https://www.codeproject.com/Questions/346784/How-to-convert-word-document-to-pdf-in-Csharp

If you cannot find a suitable open source package, you can try using the LEADTOOLS SDK. You can take that .Docx file and convert it to a PDF through use of the DocumentConverter. Here is an example:

using (DocumentConverter documentConverter = new DocumentConverter())         
{         
   var input = @"C:\Input\input.docx"); 
   var output = @"C:\Output\output.pdf");         
   var jobData = DocumentConverterJobs.CreateJobData(input, output, DocumentFormat.Pdf);         
   jobData.JobName = "Convert to Word File";         
        
   var documentWriter = new DocumentWriter();         
   documentConverter.SetDocumentWriterInstance(documentWriter);         
        
   var renderingEngine = new AnnWinFormsRenderingEngine();         
   documentConverter.SetAnnRenderingEngineInstance(renderingEngine);         
        
   var job = documentConverter.Jobs.CreateJob(jobData);         
   documentConverter.Jobs.RunJob(job);         
}    

https://www.leadtools.com/help/sdk/tutorials/dotnet-fx-winforms-convert-files-with-the-document-converter.html

You can check Free Spire.Doc, it's not open source but robust and easy to use.

https://www.e-iceblue.com/Download/download-word-for-net-free.html

Here is a simple example for converting word docx to pdf:

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(@"C:\Users\Administrator\Desktop\Test.docx");

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

In addition, it also supports lots of custom word to pdf conversion options, including encrypting the result pdf, retain bookmarks, embedding fonts and many more. You can check the following article for more details:

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

You can check these GitHub repos:

1. https://github.com/smartinmedia/Net-Core-DocX-HTML-To-PDF-Converter
2. https://github.com/Reflexe/doc_to_pdf
3. https://github.com/OfficeDev/Open-Xml-PowerTools/tree/abfbaac510d0d60e2f492503c60ef897247716cf