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A PDF image watermark is a semi-transparent picture integrated into a PDF page as a fixed element. It is often used to protect the copyright and other rights of the document owner since it can't be removed easily. What's more, for famous PDF publishers, image watermarks are also used to increase the credibility of their documents. With an image watermark of their logo, the readers of documents can identify them at a glance. This article will show how to insert image watermarks into PDF documents using Spire.PDF for Java with simple code.
Install Spire.PDF for Java
First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.
<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.pdf</artifactId>
<version>11.12.16</version>
</dependency>
</dependencies>
Insert a Single Picture Watermark into PDF
A single image watermark is usually placed at the center of a PDF page. The detailed steps for inserting a single image watermark are as follows.
- Create a PdfDocument class instance.
- Load a PDF document using PdfDocument.loadFromFile() method.
- Load a picture using PdfImage.fromFile() method.
- Get the width and height of the picture using PdfImage.getWidth() and PdfImage.getHeight() methods.
- Loop through the pages in the PDF document to insert watermarks
- Get a page using PdfDocument.getPages().get() method.
- Get the width and height of the page using PdfPageBase.getActualSize().getWidth() and PdfPageBase.getActualSize().getHeight() methods.
- Set the transparency of the watermark picture using PdfPageBase.getCanvas().setTransparency() method.
- Draw the watermark picture at the center of the page using PdfPageBase.getCanvas().drawImage() method.
- Save the document using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfBrush;
import com.spire.pdf.graphics.PdfImage;
import java.awt.*;
import java.awt.image.BufferedImage;
public class insertSingleImageWatermark {
public static void main(String[] args) {
//Create a PdfDocument class instance
PdfDocument pdf = new PdfDocument();
//Load a PDF file
pdf.loadFromFile("Goodbye Pixel.pdf");
//Load a picture
PdfImage image = PdfImage.fromFile("Logo.png");
//Get the width and height of the image
int imageWidth = image.getWidth();
int imageHeight = image.getHeight();
//Loop through the pages to insert watermark
for (int i = 0; i < pdf.getPages().getCount(); i++) {
//Get a page
PdfPageBase page = pdf.getPages().get(i);
//Get the width and height of the page
float pageWidth = (float) (page.getActualSize().getWidth());
float pageHeight = (float) (page.getActualSize().getHeight());
//Set the transparency of the watermark
page.getCanvas().setTransparency(0.3f);
//Draw the watermark picture at the middle of the page
page.getCanvas().drawImage(image, pageWidth/2 - imageWidth/2, pageHeight/2 - imageHeight/2, imageWidth, imageHeight);
}
//Save the file
pdf.saveToFile("SingleImageWatermark.pdf");
}
}
Insert Tiled Picture Watermarks into PDF
Tiled image watermarks contain a picture that is displayed multiple times on one PDF page. When inserting a tiled image watermark, we can set the number of repetitions of its picture. The detailed steps for inserting a tiled image watermark are as follow.
- Create a PdfDocument class instance.
- Load a PDF document using PdfDocument.loadFromFile() method.
- Load a picture using PdfImage.fromFile() method.
- Loop through the pages to insert watermarks.
- Get a specific page using PdfDocument.getPages().get() method.
- Use the custom method insertImageWatermark() to insert a tiled image watermark.
- Save the document using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfBrush;
import com.spire.pdf.graphics.PdfImage;
import com.spire.pdf.graphics.PdfTilingBrush;
import java.awt.*;
public class insertTiledImageWatermark {
public static void main(String[] args) {
//Create a PdfDocument class instance
PdfDocument pdf = new PdfDocument();
//Load a PDF file
pdf.loadFromFile("Goodbye Pixel.pdf");
//Load a picture
PdfImage image = PdfImage.fromFile("Logo.png");
//Loop through the pages in the PDF document to insert watermark
for (int i = 0; i < pdf.getPages().getCount(); i++ ) {
//Get a Page
PdfPageBase page = pdf.getPages().get(i);
//Use the custom method to insert a tiled image watermark
insertImageWatermark(page, image, 3, 3);
}
//Save the file
pdf.saveToFile("TiledImageWatermark.pdf");
}
static void insertImageWatermark(PdfPageBase page, PdfImage image, int row, int column) {
//Create a tile brush
PdfTilingBrush brush = new PdfTilingBrush(new Dimension((int) (page.getActualSize().getWidth()/column), (int) (page.getActualSize().getHeight()/row)));
brush.getGraphics().setTransparency(0.3f);
brush.getGraphics().save();
brush.getGraphics().translateTransform(brush.getSize().getWidth()/2 - image.getWidth()/2, brush.getSize().getHeight()/2 - image.getHeight()/2);
//Draw the watermark image at the center of the page
brush.getGraphics().drawImage(image, 0, 0);
brush.getGraphics().restore();
//Use the tile brush to draw the watermark picture
page.getCanvas().drawRectangle(brush, new Rectangle(new Point(0, 0), new Dimension((int) (page.getActualSize().getWidth()), (int) (page.getActualSize().getHeight()))));
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
When it comes to PDF documents, stamps offer an indispensable feature for adding contextual information and visual elements. These stamps can range from simple notes to complex graphics, enabling users to annotate, emphasize, or personalize their PDF content. With the ability to place stamps strategically, businesses can streamline workflows, indicate approvals, or provide concise feedback.
In this article, you will learn how to programmatically add dynamic stamps and image stamps to a PDF document using Spire.PDF for Java.
Install Spire.PDF for Java
To start, make sure to add the Spire.Pdf.jar file as a dependency in your Java program. You can download Spire.PDF for Java from our website and manually import the JAR file into your application. If you are using Maven, simply add the following code to your project's pom.xml file to include the JAR file effortlessly.
<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.pdf</artifactId>
<version>11.12.16</version>
</dependency>
</dependencies>
Prior Knowledge
In PDF, a stamp refers to an annotation or graphical element that can be added to a document to provide additional information. Spire.PDF for Java introduces the PdfRubberStampAnnotation class, which serves as a representation of a rubber stamp. To create the visual representation of a rubber stamp, the PdfTemplate class is employed. This class acts as a canvas allowing you to draw various types of information, including text, images, shapes, and date/time elements.
Add a Dynamic Stamp to PDF in Java
A dynamic stamp refers to a customizable annotation that can be added to a PDF document to indicate a specific status, approval, or other information. Unlike static stamps, dynamic stamps contain variables or fields that can be dynamically updated, such as the current date, time, username, or any other custom data.
The following are the steps to add a dynamic stamp to PDF using Spire.PDF for Java.
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.loadFromFile() method.
- Create a PdfTemplate object with desired size.
- Draw strings (including dynamic information such as date and time) on the template using PdfTemplate.getGraphics().drawString() method.
- Create a PdfRubberStampAnnotation object, and set the template as its appearance.
- Add the stamp to a specific PDF page using PdfPageBase.getAnnotationsWidget().add() method.
- Save the document to a different PDF file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.annotations.PdfRubberStampAnnotation;
import com.spire.pdf.annotations.appearance.PdfAppearance;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.text.SimpleDateFormat;
public class AddDynamicStampToPdf {
public static void main(String[] args) {
// Create a PdfDocument object
PdfDocument document = new PdfDocument();
// Load a PDF file
document.loadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pdf");
// Get the last page
PdfPageBase page = document.getPages().get(document.getPages().getCount() - 1);
// Create a PdfTemplate object
PdfTemplate template = new PdfTemplate(195, 50);
// Create two fonts
PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Elephant", Font.ITALIC, 15), true);
PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Arial", Font.ITALIC, 10), true);
// Create a solid brush and a gradient brush
PdfSolidBrush solidBrush = new PdfSolidBrush(new PdfRGBColor(Color.black));
Rectangle2D rect1 = new Rectangle2D.Float();
rect1.setFrame(new Point2D.Float(0, 0), template.getSize());
PdfLinearGradientBrush linearGradientBrush = new PdfLinearGradientBrush(rect1, new PdfRGBColor(Color.white), new PdfRGBColor(Color.orange), PdfLinearGradientMode.Horizontal);
// Create rounded rectangle path
int CornerRadius = 10;
PdfPath path = new PdfPath();
path.addArc(template.getBounds().getX(), template.getBounds().getY(), CornerRadius, CornerRadius, 180, 90);
path.addArc(template.getBounds().getX() + template.getWidth() - CornerRadius, template.getBounds().getY(), CornerRadius, CornerRadius, 270, 90);
path.addArc(template.getBounds().getX() + template.getWidth() - CornerRadius, template.getBounds().getY() + template.getHeight() - CornerRadius, CornerRadius, CornerRadius, 0, 90);
path.addArc(template.getBounds().getX(), template.getBounds().getY() + template.getHeight() - CornerRadius, CornerRadius, CornerRadius, 90, 90);
path.addLine(template.getBounds().getX(), template.getBounds().getY() + template.getHeight() - CornerRadius, template.getBounds().getX(), template.getBounds().getY() + CornerRadius / 2);
// Draw path on the template
template.getGraphics().drawPath(linearGradientBrush, path);
template.getGraphics().drawPath(PdfPens.getRed(), path);
// Draw dynamic text on the template
String s1 = "APPROVED\n";
String s2 = "By Manager at " + dateToString(new java.util.Date(), "yyyy-MM-dd HH:mm:ss");
template.getGraphics().drawString(s1, font1, solidBrush, new Point2D.Float(5, 5));
template.getGraphics().drawString(s2, font2, solidBrush, new Point2D.Float(2, 28));
// Create a rubber stamp, specifying its size and location
Rectangle2D rect2 = new Rectangle2D.Float();
rect2.setFrame(new Point2D.Float(50, (float) (page.getActualSize().getHeight() - 300)), template.getSize());
PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rect2);
// Create a PdfAppearance object and apply the template as its normal state
PdfAppearance appearance = new PdfAppearance(stamp);
appearance.setNormal(template);
// Apply the appearance to stamp
stamp.setAppearance(appearance);
// Add the stamp annotation to annotation collection
page.getAnnotationsWidget().add(stamp);
// Save the file
document.saveToFile("output/DynamicStamp.pdf");
document.close();
}
// Convert date to string
public static String dateToString(java.util.Date date, String dateFormat) {
SimpleDateFormat format = new SimpleDateFormat(dateFormat);
return format.format(date);
}
}
Add an Image Stamp to PDF in Java
An image stamp in PDF refers to a graphical element that is added to a document as an annotation or overlay. It involves placing an image onto a specific location within a PDF page.
The steps to add an image stamp to PDF using Spire.PDF for Java are as follows.
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.loadFromFile() method.
- Load an image that you want to stamp on PDF using PdfImage.fromFile() method.
- Create a PdfTemplate object based on the size of the image.
- Draw the image on the template using PdfTemplate.getGraphics().drawImage() method.
- Create a PdfRubberStampAnnotation object, and set the template as its appearance.
- Add the stamp to a specific PDF page using PdfPageBase.getAnnotationsWidget().add() method.
- Save the document to a different PDF file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.annotations.PdfRubberStampAnnotation;
import com.spire.pdf.annotations.appearance.PdfAppearance;
import com.spire.pdf.graphics.PdfImage;
import com.spire.pdf.graphics.PdfTemplate;
import java.awt.geom.Rectangle2D;
public class AddImageStampToPdf {
public static void main(String[] args) {
// Create a PdfDocument object
PdfDocument document = new PdfDocument();
// Load a PDF document
document.loadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pdf");
// Get the last page
PdfPageBase page = document.getPages().get(document.getPages().getCount() - 1);
// Load an image file
PdfImage image = PdfImage.fromFile("C:\\Users\\Administrator\\Desktop\\stamp-image.png");
// Get the width and height of the image
int width = image.getWidth();
int height = image.getHeight();
// Create a PdfTemplate object based on the size of the image
PdfTemplate template = new PdfTemplate(width, height);
// Draw image on the template
template.getGraphics().drawImage(image, 0, 0, width, height);
// Create a rubber stamp annotation, specifying its location and position
Rectangle2D rect = new Rectangle2D.Float((float) (page.getActualSize().getWidth() - width - 50), (float) (page.getActualSize().getHeight() - 400), width, height);
PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rect);
// Create a PdfAppearance object
PdfAppearance pdfAppearance = new PdfAppearance(stamp);
// Set the template as the normal state of the appearance
pdfAppearance.setNormal(template);
// Apply the appearance to the stamp
stamp.setAppearance(pdfAppearance);
// Add the stamp annotation to PDF
page.getAnnotationsWidget().add(stamp);
// Save the file
document.saveToFile("output/ImageStamp.pdf");
document.close();
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
When drawing text on PDF page, you can align text horizontally and vertically. This tutorial will show you how to align text in a line and a rectangle by using Spire.PDF for Java.
Align Text in Line
import com.spire.pdf.graphics.*;
import java.awt.*;
public class AlignTextInLine {
public static void main(String[] args) {
//create a PdfDocument object
PdfDocument doc = new PdfDocument();
//add a page
PdfPageBase page = doc.getPages().add();
//create a true type font
PdfTrueTypeFont font= new PdfTrueTypeFont(new Font("Times New Roman",Font.PLAIN,15));
//create a brush
PdfSolidBrush brush = new PdfSolidBrush(new PdfRGBColor(Color.black));
//create a PdfStringFormat object, specifying PdfTextAlignment to Left
PdfStringFormat leftAlignment = new PdfStringFormat(PdfTextAlignment.Left);
//draw text at left
page.getCanvas().drawString("Left", font , brush, 0, 20, leftAlignment);
//draw text at right
PdfStringFormat rightAlignment = new PdfStringFormat(PdfTextAlignment.Right);
page.getCanvas().drawString("Right", font , brush, page.getCanvas().getClientSize().getWidth(), 20, rightAlignment);
//draw text in center
PdfStringFormat centerAlignment = new PdfStringFormat(PdfTextAlignment.Center);
page.getCanvas().drawString("Center", font , brush, page.getCanvas().getClientSize().getWidth() / 2, 20, centerAlignment);
//save the file
doc.saveToFile("AlignTextInLine.pdf");
}
}
Output:
Align Text in Rectangle
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.Rectangle2D;
public class AlignTextInRectangle {
public static void main(String[] args) {
//create a PdfDocument object
PdfDocument doc = new PdfDocument();
//add a page
PdfPageBase page = doc.getPages().add();
//create a true type font
PdfTrueTypeFont font= new PdfTrueTypeFont(new Font("Times New Roman",Font.PLAIN,15));
//craete a pen
PdfPen pen = new PdfPen(new PdfRGBColor(Color.black));
//create a brush
PdfSolidBrush brush = new PdfSolidBrush(new PdfRGBColor(Color.black));
//draw a rectangle
Rectangle2D.Float rect = new Rectangle2D.Float();
rect.setRect(0, 20, page.getCanvas().getClientSize().getWidth() / 2, 100);
page.getCanvas().drawRectangle(pen, rect);
//create a PdfStringFormat object, specifying PdfTextAlignment to Top and Left
PdfStringFormat topLeft = new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Top);
//draw text at top left
page.getCanvas().drawString("TopLeft", font, brush, rect, topLeft);
//draw text at top right
PdfStringFormat topRight = new PdfStringFormat(PdfTextAlignment.Right, PdfVerticalAlignment.Top);
page.getCanvas().drawString("TopRight", font, brush, rect, topRight);
//draw text in center
PdfStringFormat center = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);
page.getCanvas().drawString("Center", font, brush, rect, center);
//draw text at bottom left
PdfStringFormat bottomLeft = new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Bottom);
page.getCanvas().drawString("BottomLeft", font, brush, rect, bottomLeft);
//draw text at bottom right
PdfStringFormat bottomRight = new PdfStringFormat(PdfTextAlignment.Right, PdfVerticalAlignment.Bottom);
page.getCanvas().drawString("BottomRight", font, brush, rect, bottomRight);
//save the file
doc.saveToFile("AlignTextInRectangle.pdf");
}
}
Output:
