Bhuwan Upadhyay

Talks all about software engineering

Published on

How to add QR code on pdf using java



How to add QR code on pdf using java?

This article will show you how to add QR code on pdf using java.

Add Dependencies

implementation 'com.google.zxing:core:3.4.1'
implementation 'com.google.zxing:javase:3.4.1'
implementation 'com.itextpdf:itextpdf:'

Add QR Code on PDF using Java

public class PdfUtils {

        Add QR code to pdf bytes
    public static byte[] addQRCode(byte[] pdfBytes, String barcodeText, QRCodePosition position) {
        try (ByteArrayOutputStream os = new ByteArrayOutputStream()) {
            PdfReader reader = new PdfReader(pdfBytes);
            PdfStamper stamper = new PdfStamper(reader, os);
            Image image = Image.getInstance(newQRCodeImage(barcodeText));
            for (int i = 1; i <= reader.getNumberOfPages(); i++) {
                PdfContentByte content = stamper.getOverContent(i);
                image.setAbsolutePosition(position.getAbsoluteX(), position.getAbsoluteY());
            return os.toByteArray();
        } catch (DocumentException | IOException e) {
            throw new RuntimeException("Error on writing QR code", e);

        Get new QR code image bytes for barcode text
    private static byte[] newQRCodeImage(String barcodeText) {
        try (ByteArrayOutputStream image = new ByteArrayOutputStream()) {
            QRCodeWriter barcodeWriter = new QRCodeWriter();
            BitMatrix bitMatrix = barcodeWriter.encode(barcodeText, BarcodeFormat.QR_CODE, 120, 120);
            MatrixToImageWriter.writeToStream(bitMatrix, "png", image);
            return image.toByteArray();
        } catch (WriterException | IOException e) {
            throw new RuntimeException("Error on generating QR code", e);

    public enum QRCodePosition {
        TOP_LEFT(0f, 700f),
        TOP_RIGHT(500f, 700f),
        BOTTOM_LEFT(0f, 0f),
        BOTTOM_RIGHT(500f, 0f);

        private final float absoluteX;
        private final float absoluteY;

        QRCodePosition(float absoluteX, float absoluteY) {
            this.absoluteX = absoluteX;
            this.absoluteY = absoluteY;

        public float getAbsoluteX() {
            return absoluteX;
        public float getAbsoluteY() {
            return absoluteY;