Java Requires Chilkat v11.7.0+

Add an Image (Logo) Watermark to a PDF

See more PDF Watermark Examples

Demonstrates an image watermark placed in a corner of every page. The image is a PNG or JPEG given either by path ("image.path") or, as here, as base64 in the JSON itself ("image.base64"), which suits a server that keeps its logo in a database rather than on disk. PNG transparency is kept. Giving only a width keeps the aspect ratio, and the units member says those numbers are inches rather than points. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Pdf;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // The PDF used in this example is available at four_pages.pdf

        Pdf pdf = new Pdf();
        try {
            pdf.loadFile("qa_data/pdf/four_pages.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        JsonObject json = new JsonObject();
        json.updateString("type", "image");

        // A small PNG logo, base64 encoded.  Use "image.path" instead to name a PNG or JPEG file:
        //    ignore = json.UpdateString("image.path","logo.png");
        json.updateString("image.base64", "iVBORw0KGgoAAAANSUhEUgAAAGAAAAAgCAYAAADtwH1UAAAApElEQVR42u3a7QmAIBgAYTdpo/ZphhZti6IBylLrlXoO/G3cIeFHSgAAFDKM08rCy8Jzg6Ug8UJ0JF+EDuSXRGgxX8+jufxlTk0nFuCCiF360aidXICMiDP5uQgCXAxQI782ggAHEu7IP4sgQOcBIMA35ItgBQhQEqBmtbX6xl//hAUI3gcIELwTFiD4LEiA4NNQAYLvA+BGzJ0wvIrwLggA8DgbwPbrr8c7+lkAAAAASUVORK5CYII=");

        // The size to draw it at.  Give only the width and the height follows the aspect ratio.
        json.updateString("units", "in");
        json.updateNumber("image.width", "1.5");

        // Bottom-right, half an inch in from the page edges.
        json.updateString("position.align", "bottomRight");
        json.updateNumber("position.margin", "0.5");
        json.updateNumber("opacity", "0.85");
        json.updateString("id", "logo");

        JsonObject jsonOut = new JsonObject();
        try {
            pdf.watermark("add", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("id: " + jsonOut.stringOf("id") + " pages: " + jsonOut.stringOf("pages"));

        try {
            pdf.writeFile("qa_output/four_pages_logo.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Sample output:

        // id: logo pages: 1-4
    }
}