diff --git a/File-Formats-toc.html b/File-Formats-toc.html
index f2a8476db..567b2a4d0 100644
--- a/File-Formats-toc.html
+++ b/File-Formats-toc.html
@@ -1689,6 +1689,7 @@
 					<li><a href="/file-formats/xlsio/faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document">How to set Logarithmic axis for chart in Excel document?</a></li>
 					<li><a href="/file-formats/xlsio/faqs/how-to-resolve-performance-issue-when-deleting-a-large-number-of-rows">How to resolve performance issue when deleting a large number of rows?</a></li>
 					<li><a href="/file-formats/xlsio/faqs/how-to-hide-columns-using-column-name">How to hide columns using column name?</a></li>
+					<li><a href="/file-formats/xlsio/faqs/how-to-convert-xls-document-to-xlsx-format-document">How to convert xls document to xlsx format document?</a></li>
                 </ul>
 			</li>
         </ul>
diff --git a/File-Formats/XlsIO/FAQ.md b/File-Formats/XlsIO/FAQ.md
index 480f40187..64ad1a874 100644
--- a/File-Formats/XlsIO/FAQ.md
+++ b/File-Formats/XlsIO/FAQ.md
@@ -83,4 +83,5 @@ The frequently asked questions in Essential XlsIO are listed below.
 * [How to fix the ArgumentOutOfRangeException when accessing a large number of rows and columns?](faqs/how-to-fix-the-argument-out-of-range-exception-when-accessing-a-large-number-of-rows-and-columns)
 * [How to set Logarithmic axis for chart in Excel document?](faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document)
 * [How to resolve performance issue when deleting a large number of rows?](faqs/how-to-resolve-performance-issue-when-deleting-a-large-number-of-rows)
-* [How to hide columns using column name](faqs/how-to-hide-columns-using-column-name)
\ No newline at end of file
+* [How to hide columns using column name?](faqs/how-to-hide-columns-using-column-name)
+* [How to convert xls document to xlsx format document?](faqs/how-to-convert-xls-document-to-xlsx-format-document)
\ No newline at end of file
diff --git a/File-Formats/XlsIO/faqs/how-to-convert-xls-document-to-xlsx-format-document.md b/File-Formats/XlsIO/faqs/how-to-convert-xls-document-to-xlsx-format-document.md
new file mode 100644
index 000000000..9df421c19
--- /dev/null
+++ b/File-Formats/XlsIO/faqs/how-to-convert-xls-document-to-xlsx-format-document.md
@@ -0,0 +1,66 @@
+---
+title: How to convert xls document to xlsx format document |Syncfusion.
+description: This page explains how to convert xls document to xlsx format document using Syncfusion .NET Excel library (XlsIO).
+platform: file-formats
+control: XlsIO
+documentation: UG
+---
+
+# How to convert xls document to xlsx format document?
+
+The following code illustrates how to convert xls document to xlsx format document.
+
+{% tabs %}
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+using (ExcelEngine excelEngine = new ExcelEngine())
+{
+    IApplication application = excelEngine.Excel;
+    application.DefaultVersion = ExcelVersion.Xlsx;
+    
+    //Loads an xls file
+    FileStream fileStream = new FileStream("InputTemplate.xls", FileMode.Open, FileAccess.Read);
+    IWorkbook workbook = application.Workbooks.Open(fileStream);
+
+    //Set the workbook version to xlsx
+    workbook.Version = ExcelVersion.Xlsx;
+    
+    //Saving the workbook as stream in xlsx format
+    FileStream stream = new FileStream("Output.xlsx", FileMode.Create, FileAccess.ReadWrite);
+    workbook.SaveAs(stream);
+    stream.Dispose();
+}
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+using (ExcelEngine engine = new ExcelEngine())
+{
+    IApplication application = engine.Excel;
+    application.DefaultVersion = ExcelVersion.Xlsx;
+
+    //Loads an xls file
+    IWorkbook workbook = application.Workbooks.Open("InputTemplate.xls");
+
+    //Set the workbook version to xlsx
+    workbook.Version = ExcelVersion.Xlsx;
+
+    //Saving the workbook in xlsx format
+    workbook.SaveAs("Output.xlsx");
+}
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+Using engine As ExcelEngine = New ExcelEngine()
+    Dim application As IApplication = engine.Excel
+    application.DefaultVersion = ExcelVersion.Xlsx
+
+    'Loads an xls file
+    Dim workbook As IWorkbook = application.Workbooks.Open("InputTemplate.xls")
+
+    'Set the workbook version to xlsx
+    workbook.Version = ExcelVersion.Xlsx;
+
+    'Saving the workbook in xlsx format
+    workbook.SaveAs("Output.xlsx")
+End Using
+{% endhighlight %}
+{% endtabs %}
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