Convert XLS to XLSX

Java library for converting XLS to XLSX

Use the Conversion API of of Cells Cloud to create customized spreadsheet workflows in Java projects. This is a professional solution to convert XLS to XLSX and other document formats online using Java.

Convert XLS to XLSX using Cells Cloud SDK for Java


Converting file formats from XLS to XLSX can be a complex task. Our Java SDK handles all XLS to XLSX format conversions while preserving the main structural and logical content of the source XLS spreadsheet. Our Java library provides a professional solution for converting XLS to XLSX files online. This Cloud SDK empowers Java developers with powerful functionality and ensures high-quality XLSX output.

Java Code Example for converting XLS to XLSX using Cells Cloud SDK

// For complete examples and data files, please go to
    public class Conversion {
        public static void main(String[] args) {
            String name =  "Book1.xls";
            String format = "xlsx";
            String password = null;
            String outPath = null;
            String destFile = "DestFile.xlsx";
            try {
                CellsApi cellsApi = new CellsApi(System.getenv("ProductClientId"), System.getenv("ProductClientSecret"));
                File response = cellsApi.cellsWorkbookPutConvertWorkbook(new File(name), format, password, outPath, null,null);            
                        response.renameTo(new File(destFile));
            catch(Exception exception )

How to convert XLS to XLSX using the Cells Cloud Java library.

  1. Register an account at Dashboard to get free API quota & authorization details
  2. Install Java library and add the reference (import the library) to your project.
  3. Open the source file in Java.
  4. Use the `putConvertWorkbook` method to retrieve the resulting stream.

System Requirements

  1. Maven 2.2.0 or newer
  2. Java(TM) SE Runtime Environment