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XLSX

Convert XLS to XLSX in C#

High-speed C# library for converting XLS to XLSX. This is a professional software solution to import and export XLS, XLSX, and many other formats on .NET Framework, .NET Core or Mono Platforms.

Convert XLS to XLSX Using C#

How do I convert XLS to XLSX? With Aspose.Cells for .NET library, you can easily convert XLS to XLSX programmatically with a few lines of code. Aspose.Cells for .NET is capable of building cross-platform applications with the ability to generate, modify, convert, render and print all Excel files. .NET Excel API not only convert between spreadsheet formats, it can also render Excel files as images, PDF, HTML, ODS, CSV, SVG, JSON, WORD, PPT and more, thus making it a perfect choice to exchange documents in industry-standard formats. Open NuGet package manager, search for Aspose.Cells and install. You may also use the following command from the Package Manager Console.

Package Manager Console Command


PM> Install-Package Aspose.Cells

Save XLS to XLSX in C#

The following example demonstrates how to convert XLS to XLSX in C#.

Follow the easy steps to convert XLS to XLSX. Upload your XLS file, then simply save it as XLSX file. For both XLS reading and XLSX writing you can use fully qualified filenames. The output XLSX content and formatting will be identical to the original XLS document.

Sample Code to Convert XLS to XLSX
Input file
Select format
   
                                   
    
	
  using Aspose.Cells;     
  var workbook = new Workbook("Input.xlsx");
  workbook.Save("Output.pdf");
	                
                
            

How to Convert XLS to XLSX via C#

Need to convert XLS files to XLSX programmatically? .NET developers can easily load & convert XLS to XLSX in just a few lines of code.

  1. Install ‘Aspose.Cells for .NET’.
  2. Add a library reference (import the library) to your C# project.
  3. Load XLS file with an instance of Workbook.
  4. Convert XLS to XLSX by calling Workbook.Save method.
  5. Get the conversion result of XLS to XLSX.

C# library to convert XLS to XLSX

There are two alternative options to install “Aspose.Cells for .NET” onto your system. Please choose one that resembles your needs and follow the step-by-step instructions:

  1. Install a NuGet Package . See Documentation
  2. Install the library using Package Manager Console within Visual Studio IDE

System Requirements

Before running the .NET conversion example code, make sure that you have the following prerequisites.

  • Microsoft Windows or a compatible OS with .NET, .NET Core, Windows Azure or Mono Platforms..
  • Development environment like Microsoft Visual Studio.
  • Add reference to the Aspose.Cells for .NET DLL in your project.

XLS What is XLS File Format?

Files with XLS extension represent Excel Binary File Format. Such files can be created by Microsoft Excel as well as other similar spreadsheet programs such as OpenOffice Calc or Apple Numbers. File saved by Excel is known as Workbook where each workbook can have one or more worksheets. Data is stored and displayed to users in table format in worksheet and can span numeric values, text data, formulas, external data connections, images, and charts. Applications like Microsoft Excel lets you export workbook data to several different formats including PDF, CSV, XLSX, TXT, HTML, XPS, and several others. The XLS file format was replaced with a more open and structured format, XLSX, with the release of Microsoft Excel 2007. The latest versions still provide support for creating and reading XLS files, though XLSX is the first choice of use now.

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XLSX What is XLSX File Format?

XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007. Based on structure organized according to the Open Packaging Conventions as outlined in Part 2 of the OOXML standard ECMA-376, the new format is a zip package that contains a number of XML files. The underlying structure and files can be examined by simply unzipping the .xlsx file.

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Other Supported Conversions

You can also convert XLS to many other file formats including few listed below.

XLS TO BMP (Bitmap Image)
XLS TO EMF (Enhanced Metafile Format)
XLS TO GIF (Graphical Interchange Format)
XLS TO HTML (Hyper Text Markup Language)
XLS TO MD (Markdown Language)
XLS TO MHTML (Web Page Archive Format)
XLS TO ODS (OpenDocument Spreadsheet File)
XLS TO PDF (Portable Document Format)
XLS TO PNG (Portable Network Graphics)
XLS TO SVG (Scalable Vector Graphics)
XLS TO TIFF (Tagged Image Format)
XLS TO TSV (Tab-Separated Values)
XLS TO TXT (Text Document)
XLS TO XLSB (Binary Excel Workbook File)
XLS TO XLSM (Spreadsheet File)
XLS TO XLSX (OOXML Excel File)
XLS TO XLT (Microsoft Excel Template)
XLS TO XLTM (Excel Macro-enabled Template)
XLS TO XLTX (Office OpenXML Excel Template)
XLS TO XML (Extensible Markup Language)
XLS TO XPS (XML Paper Specifications)
XLS TO JSON (JavaScript Object Notation)