Microsoft® Excel Files Conversion via Java

Save Microsoft Excel documents as spreadsheet, web, image and fixed-layout formats


For any Excel converter application or solution, Java Excel Library speeds up spreadsheet programming and conversion processes while handling multiple formats including XLS, XLSX, XLSM, XLSB, XLTX, XLTM, CSV, SpreadsheetML, ODS. It also allows to convert Excel files to PDF, XPS, HTML, MHTML, Plain Text and popular image formats such as TIFF, JPG, PNG, BMP and SVG.

Inter-conversion of Microsoft Excel Formats

Inter-conversion of spreadsheet format only requires loading a spreadsheet with an instance of Workbook and saving back in the desired format while selecting appropriate value from SaveFormat enumeration.

Java Example Code for Excel File Format Conversion
// load the source file
var wkb = new Workbook("sourceFile.xls");
// save as XLSX, ODS, SXC & FODS formats"xlsx-output.xlsx", SaveFormat.XLSX);"ods-output.ods", SaveFormat.ODS);"scx-output.scx", SaveFormat.SXC);"fods-output.fods", SaveFormat.FODS);

Convert Excel to PDF, XPS, HTML & MD

Specialized classes are available to control the conversion process for specific output formats such as PdfSaveOptions to convert Excel files as PDF, XpsSaveOptions to export Excel as XPS, HtmlSaveOptions to render Excel as HTML and MarkdownSaveOptions for Excel to Markdown conversion.

Java Sample Code for Excel to PDF and Web Formats
// load template Excel file from disc
var bk = new Workbook("source-file.xlsx");

// convert Excel to PDF using Java
// Create PDF options
PdfSaveOptions options = new PdfSaveOptions();
options.setCompliance(PdfCompliance.PDF_A_1_A);"excel-to-pdf.pdf", options);
// save Excel in XPS"output.xps", new XpsSaveOptions());
// save Excel in HTML"output.html", new HtmlSaveOptions());
// save Excel in Markdown (MD)"", new MarkdownSaveOptions());

// one can set relevant save options as of his choice before saving into relevant format

Convert JSON to Excel and Excel to JSON

JSON data can be imported into an instance of Workbook class with the help of JSONUtility.importData for further processing or simple conversion to any of the supported formats. Similarly, Worksheet data can be exported as JSON by creating a Range or cells and calling the exportRangeToJson method.

Java Code for JSON to Excel Conversion
Workbook workbook = new Workbook(path + "source-file.xlsx");
Worksheet wks = workbook.getWorksheets().get(0);
// Read File
File file = new File(path + "source-data.json");
BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
String jsonInput = "";
String tempString;
while ((tempString = bufferedReader.readLine()) != null) {
	jsonInput = jsonInput + tempString; 
// Set JsonLayoutOptions
JsonLayoutOptions options = new JsonLayoutOptions();

// Import JSON Data
JSONUtility.importData(jsonInput, wks.getCells(), 0, 0, options);

// Save Excel file + "excel-to-json.out.xlsx");
Java Source Code for Excel to JSON Conversion
// load XLSX file with an instance of Workbook
Workbook workbook = new Workbook("sourceFile.xlsx");
// access CellsCollection of the worksheet containing data to be converted
Cells cells = workbook.getWorksheets().get(0).getCells();
// create & set ExportRangeToJsonOptions for advanced options
ExportRangeToJsonOptions exportOptions = new ExportRangeToJsonOptions();
// create a range of cells containing data to be exported
Range range = cells.createRange(0, 0, cells.getLastCell().getRow() + 1, cells.getLastCell().getColumn() + 1);
// export range as JSON data
String jsonData = JsonUtility.exportRangeToJson(range, exportOptions);
// write data to disc in JSON format
BufferedWriter writer = new BufferedWriter(new FileWriter("output.json"));

Save Excel Worksheets to Images

Each worksheet can be converted to different image formats including JPG, BMP, PNG & GIF, set by the ImageType property. For any Convert Excel to Images case, select the relevant case from links.

Java Code for Excel to Image Conversion
// load template spreadsheet
var wkb = new Workbook("template.xlsx");

// Create an object for ImageOptions
ImageOrPrintOptions imgOptions = new ImageOrPrintOptions();

// Set the image type

// Get the first worksheet.
Worksheet sheet = wkb.getWorksheets().get(0);

// Create a SheetRender object for the target sheet
SheetRender sr = new SheetRender(sheet, imgOptions);
for (int j = 0; j < sr.getPageCount(); j++) {
	// Generate an image for the worksheet
	sr.toImage(j, dataDir + "WToImage-out" + j + ".png");

Convert Microsoft Excel to Word and PowerPoint

It is possible to load any spreadsheet and convert it to Word DOCX & PowerPoint PPTX files while using DocxSaveOptions & PptxSaveOptions classes as demonstrated below.

Java Code for Excel to Word & PowerPoint Conversion
// load the template file
var wkb = new Workbook("template.xlsx");
// save spreadsheet as DOCX"output.docx", new DocxSaveOptions());
// save spreadsheet as PPTX"output.pptx", new PptxSaveOptions());