Write a QR code to an image

This guide shows how to generate a QR code and write it to an image.

Use this workflow when you need to:

• Encode URLs or identifiers in QR format
• Generate QR assets for print or digital channels
• Integrate QR creation into automated pipelines

Prepare the project

Register the SDK license before running barcode operations. For setup details, refer to the getting started with .NET SDK guide.

using GdPicture14;

LicenseManager licence = new LicenseManager();
licence.RegisterKEY(""); // Set your license key

Create the image canvas

Create a blank image to host the QR code:

using GdPictureImaging imaging = new GdPictureImaging();

// Create a new image canvas with specified dimensions and color depth
int imageId = imaging.CreateNewGdPictureImage(600, 300, 32, imaging.ARGBI(255, 255, 255, 255));

Generate the QR code

Write the QR code to the image:

// Generate QR code with specified data and formatting parameters
imaging.BarcodeQRWrite(imageId, "https://www.nutrient.io",
                       BarcodeQREncodingMode.BarcodeQREncodingModeUndefined,
                       BarcodeQRErrorCorrectionLevel.BarcodeQRErrorCorrectionLevelH,
                       0, 5, 5, 50, 50, 0,
                       GdPicture14.Imaging.GdPictureColor.Black,
                       GdPicture14.Imaging.GdPictureColor.White);

This configuration uses high error correction (H) and a black-on-white color scheme for scan reliability.

Save the output image

Export the generated QR code as PNG:

// Save the generated QR code image as PNG format
imaging.SaveAsPNG(imageId, @"output_qr_code.png");

QR code options

BarcodeQRWrite accepts the following configurable parameters:

• Error correction level (L, M, Q, H)
• Encoding mode
• Size and position
• Foreground and background colors

Conclusion

This workflow generates a QR code image for use in labels, documents, and digital channels.