Add Text Watermark and Image Watermark to PDF in Java

In this blog, I’ll introduce how to add text watermark and image watermark to a PDF file using Free Spire.PDF for Java library.

Before using the below code, you need to download Free Spire.PDF for Java from this link and import the jar file under the lib folder to your project.

Add text watermark

import com.spire.pdf.*;
import com.spire.pdf.graphics.*;

import java.awt.*;
import java.awt.geom.*;

public class Watermark {
    public static void main(String[] args){
        //load PDF file
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("Software - Wikipedia.pdf");

        //add text watermark to every page in the PDF file
        for(int i = 0; i< pdf.getPages().getCount(); i++) {
            PdfPageBase page = pdf.getPages().get(i);
            Dimension2D dimension2D = new Dimension();
            dimension2D.setSize(page.getCanvas().getClientSize().getWidth() / 2, page.getCanvas().getClientSize().getHeight() / 3);
            PdfTilingBrush brush = new PdfTilingBrush(dimension2D);
            brush.getGraphics().setTransparency(0.3F);
            brush.getGraphics().save();
            brush.getGraphics().translateTransform((float) brush.getSize().getWidth() / 2, (float) brush.getSize().getHeight() / 2);
            brush.getGraphics().rotateTransform(-45);
            brush.getGraphics().drawString("textWatermark", new PdfTrueTypeFont(new Font("Arial Unicode MS",Font.PLAIN,30),true), PdfBrushes.getRed(), 0, 0, new PdfStringFormat(PdfTextAlignment.Center));
            brush.getGraphics().restore();
            brush.getGraphics().setTransparency(1);
            Rectangle2D loRect = new Rectangle2D.Float();
            loRect.setFrame(new Point2D.Float(0, 0), page.getCanvas().getClientSize());
            page.getCanvas().drawRectangle(brush, loRect);
        }

        //save and close
        pdf.saveToFile("TextWatermark.pdf");
        pdf.close();
    }
}

Add image watermark

import com.spire.pdf.*;

import java.awt.geom.Rectangle2D;

public class ImageWatermark {
    public static void main(String[] args){
        //load PDF file
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("Software - Wikipedia.pdf");

        //add image watermark to every page in the PDF file
        for(int i = 0; i< pdf.getPages().getCount(); i++) {
            PdfPageBase page = pdf.getPages().get(i);
            page.setBackgroundImage("timg.jpg");
            Rectangle2D rect = new Rectangle2D.Float();
            rect.setFrame(page.getClientSize().getWidth() / 2 - 100, page.getClientSize().getHeight() / 2 - 100, 200, 200);
            page.setBackgroundRegion(rect);
        }

        //save and close
        pdf.saveToFile("ImageWatermark.pdf");
        pdf.close();
    }
}