Add Text Watermark to PowerPoint in Java

A watermark in PowerPoint is semi-transparent text visible on a slide. It is used to indicate a document’s status (confidential, draft, etc.) or to state the ownership of a document. Although PowerPoint doesn’t provide a built-in watermark feature, this article will share how to programmatically add a text watermark or multiline watermarks to a PowerPoint slide using Free Spire.Presentation for Java.

Import Dependency (2 Methods)

● Download the free library and unzip it, and then add the Spire.Presentation.jar file to your project as dependency.

● Directly add the jar dependency to your maven project by adding the following configurations to the pom.xml.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.presentation.free</artifactId>
        <version>5.1.0</version>
    </dependency>
</dependencies>

Insert a Text Watermark into PowerPoint

import com.spire.presentation.*;
import com.spire.presentation.drawing.FillFormatType;
import java.awt.*;
import java.awt.geom.Rectangle2D;

public class TextWatermark {
    public static void main(String[] args) throws Exception {

        //Create a PPT document and load the sample file
        Presentation presentation = new Presentation();
        presentation.loadFromFile("E:\\Files\\input.pptx");

        //Set the width and height of watermark string
        int width= 400;
        int height= 300;
        //Define a rectangle range
        Rectangle2D.Double rect = new Rectangle2D.Double((presentation.getSlideSize().getSize().getWidth() - width) / 2,
                (presentation.getSlideSize().getSize().getHeight() - height) / 2, width, height);

        //Add a rectangle shape with a defined range
        IAutoShape shape = presentation.getSlides().get(0).getShapes().appendShape(ShapeType.RECTANGLE, rect);

        //Set the style of shape
        shape.getFill().setFillType(FillFormatType.NONE);
        shape.getShapeStyle().getLineColor().setColor(Color.white);
        shape.setRotation(-45);
        shape.getLocking().setSelectionProtection(true);
        shape.getLine().setFillType(FillFormatType.NONE);


        //Add text to shape
        shape.getTextFrame().setText("Confidential");
        PortionEx textRange = shape.getTextFrame().getTextRange();

        //Set the style of the text range
        textRange.getFill().setFillType(FillFormatType.SOLID);
        textRange.getFill().getSolidColor().setColor(new Color(176, 48, 96));
        textRange.setFontHeight(50);

        //Save the document
        presentation.saveToFile("AddTextWatermark.pptx", FileFormat.PPTX_2010);
    }
}

Add Multiline Watermarks to PowerPoint

import com.spire.pdf.graphics.PdfTrueTypeFont;
import com.spire.presentation.*;
import com.spire.presentation.drawing.FillFormatType;

import java.awt.*;
import java.awt.geom.Dimension2D;
import java.awt.geom.Rectangle2D;

public class AddMultilineWatermarks {

    public static void main(String[] args) throws Exception {

        //Create a Presentation object
        Presentation presentation = new Presentation();

        //Load the sample PowerPoint file
        presentation.loadFromFile("E:\\Files\\input.pptx");

        //Specify watermark text
        String watermarkText = "Draft";

        //Get the size of the watermark text
        Font font = new java.awt.Font("Arial", java.awt.Font.BOLD, 20);
        PdfTrueTypeFont trueTypeFont = new PdfTrueTypeFont(font);
        Dimension2D strSize = trueTypeFont.measureString(watermarkText);

        //Initialize x and y coordinate
        float x = 30;
        float y = 80;

        for (int rowNum = 0; rowNum < 4; rowNum++) {
            for (int colNum = 0; colNum < 5; colNum++) {

                //Add a rectangle shape
                Rectangle2D rect = new Rectangle2D.Float(x, y, (float) strSize.getWidth() + 10, (float) strSize.getHeight());
                IAutoShape shape = presentation.getSlides().get(0).getShapes().appendShape(ShapeType.RECTANGLE, rect);

                //Set the style of the shape
                shape.getFill().setFillType(FillFormatType.NONE);
                shape.getShapeStyle().getLineColor().setColor(new Color(1, 1, 1, 0));
                shape.setRotation(-45);
                shape.getLocking().setSelectionProtection(true);
                shape.getLine().setFillType(FillFormatType.NONE);

                //Add watermark text to the shape
                shape.getTextFrame().setText(watermarkText);
                PortionEx textRange = shape.getTextFrame().getTextRange();

                //Set the style of the text range
                textRange.getFill().setFillType(FillFormatType.SOLID);
                textRange.getFill().getSolidColor().setColor(new Color(176, 48, 96));
                textRange.setLatinFont(new TextFont(trueTypeFont.getName()));
                textRange.setFontMinSize(trueTypeFont.getSize());

                x += (100 + strSize.getWidth());

            }
            x = 30;
            y += (100 + strSize.getHeight());
        }

        //Save the document
        presentation.saveToFile("MultilineWatermark.pptx", FileFormat.PPTX_2013);
    }
}