// Prepare HTML code and save it to a file
String code = "<span>Hello,</span> <span>World!!</span>";
try (java.io.FileWriter fileWriter = new java.io.FileWriter("png.html")) {
    fileWriter.write(code);
}

// Initialize an HTML document from the file
HTMLDocument document = new HTMLDocument("png.html");

// Initialize ImageSaveOptions
ImageSaveOptions options = new ImageSaveOptions(ImageFormat.Png);

// Convert HTML to PNG
Converter.convertHTML(document, options, "png-output.png");