using IronQr; using IronPdf; using IronSoftware.Drawing; // Generate QR code and save as bitmap AnyBitmap qrBitmap = QrWriter.Write("hello world").Save(); // Load an existing PDF document PdfDocument pdf = PdfDocument.FromFile("sample.pdf"); // Stamp the QR code onto the first page at position x=505, y=20 (top-right corner) pdf.DrawBitmap(qrBitmap, pageIndex: 0, x: 505, y: 20, desiredWidth: 70, desiredHeight: 70, pixelFormat: PixelFormat.Format32bppArgb, ignorePageRotation: false); // Save the modified PDF pdf.SaveAs("output.pdf");

Imports IronQr Imports IronPdf Imports IronSoftware.Drawing ' Generate QR code and save as bitmap Dim qrBitmap As AnyBitmap = QrWriter.Write("hello world").Save() ' Load an existing PDF document Dim pdf As PdfDocument = PdfDocument.FromFile("sample.pdf") ' Stamp the QR code onto the first page at position x=505, y=20 (top-right corner) pdf.DrawBitmap(qrBitmap, pageIndex:=0, x:=505, y:=20, desiredWidth:=70, desiredHeight:=70, pixelFormat:=PixelFormat.Format32bppArgb, ignorePageRotation:=False) ' Save the modified PDF pdf.SaveAs("output.pdf")

Stamp QR Code to PDF

Stamping a QR code directly onto an existing PDF page embeds scannable information without restructuring the document. IronQR handles this in three steps: create a QrWriter, generate the QR code with Write, then call StampToExistingPdfPage with the PDF path and the x and y coordinates that position the stamp on the chosen page.

3-step guide for stamping a QR code into a PDF

QrWriter writer = new QrWriter();
QrCode myQr = writer.Write("hello world");
myQr.StampToExistingPdfPage("sample.pdf", 505, 20, 0, "");

Code Explanation

QrWriter.Write generates the QR code and returns a QrCode. Calling StampToExistingPdfPage on that QrCode stamps it directly onto the source PDF, taking the PDF path, the x and y position, the zero-based pageIndex, and the PDF password (empty here). The x and y values position the stamp on the page — 505, 20 places it near the top-right corner.

Common use cases include embedding payment links on invoices, adding verification codes to legal documents, and placing tracking IDs on event tickets. For size-to-data tradeoffs, configure a QrOptions object with a different error correction level and pass it to QrWriter.Write.

Explore How to Stamp QR Codes into PDF Pages with IronQR.