从7.3.3版本开始，Spire.Doc支持转换Word文档到PDF时，保留Word文档的标题作为PDF书签。本文将介绍如何使用Spire.Doc来实现这一功能。

原Word文档：

using Spire.Doc;

namespace Keep_word_headings_as_pdf_bookmarks {
    
    class Program {
        
        private static void Main(string[] args) {
            Document doc = new Document(false);
            doc.LoadFromFile("Input.docx");
            ToPdfParameterList topdf = new ToPdfParameterList();
            topdf.CreateWordBookmarks = true;
            topdf.CreateWordBookmarksUsingHeadings = true;
            doc.SaveToFile("Output.pdf", topdf);
        }
    }
}

Imports Spire.Doc

Namespace Keep_word_headings_as_pdf_bookmarks
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)
            Dim doc As Document = New Document(false)
            doc.LoadFromFile("Input.docx")
            Dim topdf As ToPdfParameterList = New ToPdfParameterList
            topdf.CreateWordBookmarks = true
            topdf.CreateWordBookmarksUsingHeadings = true
            doc.SaveToFile("Output.pdf", topdf)
        End Sub
    End Class
End Namespace

生成PDF文档：