Generate qr code with logo in C#

This article shows you how to generate a qr code with logo or image in c# code examples using ZXing .NET.

To play the demo, you can drag a PictureBox and a Button from your visual toolbox into your winform, then layout your UI as simple as below.

You can easily generate a custom QRCode with logo image by using ZXing.Net library.

Next, You need to download and install ZXing.Net from the Manage Nuget Packages.

As you know, ZXing.Net is a port of ZXing. It's an open-source that helps you generate qr code or barcode.

Add code to handle your windows forms as shown below.

using System;
using System.Drawing;
using System.Windows.Forms;
using ZXing;
using ZXing.Common;
using ZXing.QrCode.Internal;
using ZXing.Rendering;

namespace QRApp1
{
    public partial class frmQRCoder : Form
    {
        public frmQRCoder()
        {
            InitializeComponent();
        }

        public bool CheckQRCode(Bitmap bmp)
        {
            BarcodeReader reader = new BarcodeReader();
            var result = reader.Decode(bmp);
            if (result == null)
                return false;
            return result.Text == url;
        }


        public Bitmap GenerateQRCode(int width, int height, string text)
        {
            var barcodeWriter = new BarcodeWriter();
            var encodingOptions = new EncodingOptions { Width = width, Height = height, Margin = 0, PureBarcode = false };
            encodingOptions.Hints.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            barcodeWriter.Renderer = new BitmapRenderer();
            barcodeWriter.Options = encodingOptions;
            barcodeWriter.Format = BarcodeFormat.QR_CODE;
            Bitmap bitmap = barcodeWriter.Write(text);
            Bitmap overlay = new Bitmap(Application.StartupPath + "/logo.png");
            Graphics g = Graphics.FromImage(bitmap);
            g.DrawImage(overlay, new Point((bitmap.Width - overlay.Width) / 2, (bitmap.Height - overlay.Height) / 2));
            return bitmap;
        }

        private void frmQRCoder_Load(object sender, EventArgs e)
        {
            pictureBox1.Image = GenerateQRCode(400, 400, @"http://c-sharpcode.com");
            pictureBox1.Height = 400;
            pictureBox1.Width = 400;
        }

        private void btnValid_Click(object sender, EventArgs e)
        {
            MessageBox.Show(CheckQRCode(new Bitmap(pictureBox1.Image)).ToString());
        }
    }
}

You can easily get data from qr code image by using result.Text