Add Text or Image Watermark in PDF using Java

readme.md

Read the complete article on adding watermark to PDF in Java: https://blog.aspose.com/2021/06/30/add-watermark-to-pdf-using-java/

add-image-watermark-to-pdf.java

// Load PDF document
Document doc = new Document("input.pdf");

// Create a background artifact
BackgroundArtifact background = new BackgroundArtifact();

// Specify the image for background artifact object
background.setBackgroundImage(new FileInputStream("logo.png"));
background.setOpacity(0.5);
background.setArtifactHorizontalAlignment(HorizontalAlignment.Center);
background.setArtifactVerticalAlignment(VerticalAlignment.Center);

// Add watermark to the first page of PDF
doc.getPages().get_Item(1).getArtifacts().add(background);

// Save watermarked PDF document
doc.save("watermark.pdf");

add-text-watermark-to-pdf.java

// Load PDF document
Document doc = new Document("input.pdf");

// Create a formatted text
FormattedText formattedText = new FormattedText("Confidential Document", java.awt.Color.RED, FontStyle.Courier, EncodingType.Identity_h, true, 40.0F);

// Create watermark artifact and set its properties
WatermarkArtifact artifact = new WatermarkArtifact();        
artifact.setText(formattedText);        
artifact.setArtifactHorizontalAlignment (HorizontalAlignment.Center);
artifact.setArtifactVerticalAlignment (VerticalAlignment.Center);
artifact.setRotation (25);
artifact.setOpacity (0.5);
artifact.setBackground (false);

// Add watermark to the first page of PDF
doc.getPages().get_Item(1).getArtifacts().add(artifact);

// Save watermarked PDF document
doc.save("watermark.pdf");