Namespace IronPdf.Editing

Classes

BarcodeEncoding

PDF Barcode Encoding Types. Please check the supported characters for each encoding type as some do not support all symbols.

Setting a BarcodeEncoding when rendering Barcodes chooses the type and design of barcode to be generated.

// Add product barcode:
var barcode = new BarcodeStamper("ABC123456", BarcodeEncoding.Code128);
pdf.ApplyStamp(barcode);
// Add QR code for URL:
var qr = new BarcodeStamper("https://example.com", BarcodeEncoding.QRCode);
pdf.ApplyStamp(qr);
// Add inventory code:
var code39 = new BarcodeStamper("ITEM-12345", BarcodeEncoding.Code39);
pdf.ApplyStamp(code39);

See: https://ironpdf.com/how-to/add-barcodes-to-pdfs/

BarcodeStamper

Stamps barcodes and QR codes onto PDF pages for tracking, URLs, and data encoding. Supports Code128, Code39, and QR Code formats with customizable dimensions.

Example - Add barcodes to PDFs:

var pdf = PdfDocument.FromFile("invoice.pdf");
// QR code for payment URL (top-right corner):
var paymentQR = new BarcodeStamper(
"https://pay.example.com/inv-12345",
BarcodeEncoding.QRCode)
{
Width = 100,
Height = 100,
HorizontalAlignment = HorizontalAlignment.Right,
VerticalAlignment = VerticalAlignment.Top,
VerticalOffset = new Length(20, MeasurementUnit.Pixel)
};
pdf.ApplyStamp(paymentQR);
// Product barcode (bottom of page):
var productCode = new BarcodeStamper(
"SKU-2024-0012345",
BarcodeEncoding.Code128)
{
Width = 200,
Height = 50,
VerticalAlignment = VerticalAlignment.Bottom
};
pdf.ApplyStamp(productCode);
pdf.SaveAs("invoice_with_barcodes.pdf");

HorizontalAlignment

The horizontal alignment relative to the page.

HtmlStamper

Stamps rich HTML content onto PDF pages with full CSS/JavaScript support. Enables complex layouts, images, tables, and dynamic content for advanced stamping.

// Simple HTML watermark:
var watermark = new HtmlStamper(@"
    <div style='opacity:0.3; font-size:72px; color:red;
                transform:rotate(-45deg)'>
        CONFIDENTIAL
    </div>");
pdf.ApplyStamp(watermark);

// Complex footer with table:
var footer = new HtmlStamper(@"
    <table style='width:100%'>
        <tr>
            <td>{date}</td>
            <td style='text-align:center'>Page {page}</td>
            <td style='text-align:right'>© 2024</td>
        </tr>
    </table>");
pdf.ApplyStamp(footer);

// Logo with external image:
var logo = new HtmlStamper(
    "<img src='logo.png' width='100'/>",
    @"C:\images\");  // Base URL for resources
pdf.ApplyStamp(logo);

Supports full HTML5/CSS3/JavaScript rendering

External resources require HtmlBaseUrl to be set

See: https://ironpdf.com/how-to/stamping/#html-stamper

ImageStamper

Stamps images onto PDF pages for logos, signatures, watermarks, and visual elements. Supports various image formats and flexible positioning/sizing options.

// Company logo:
var logo = new ImageStamper("logo.png") {
    Width = new Length(100, MeasurementUnit.Pixel),
    Height = new Length(50, MeasurementUnit.Pixel),
    HorizontalAlignment = HorizontalAlignment.Right,
    VerticalAlignment = VerticalAlignment.Top
};
pdf.ApplyStamp(logo);

// Signature on last page:
var signature = new ImageStamper("signature.jpg") {
    HorizontalOffset = new Length(400, MeasurementUnit.Pixel),
    VerticalOffset = new Length(100, MeasurementUnit.Pixel)
};
pdf.ApplyStamp(signature, pdf.PageCount - 1);

// Semi-transparent watermark:
var watermark = new ImageStamper("watermark.png") {
    Opacity = 30,
    Layer = StampLayer.BehindExistingPDFContent,
    HorizontalAlignment = HorizontalAlignment.Center,
    VerticalAlignment = VerticalAlignment.Middle
};
pdf.ApplyStamp(watermark);

// From bitmap (requires disposal):
using (var stamper = new ImageStamper(myBitmap)) {
    pdf.ApplyStamp(stamper);
}

Supports PNG, JPG, GIF, BMP, TIFF, WEBP formats

Always dispose when using AnyBitmap constructor

See: https://ironpdf.com/how-to/stamping/#image-stamper

Length

Represents a value with a specific measurement unit.

MeasurementUnit

The unit of measurement used for positioning and sizing.

Stamper

Defines a PDF Stamper.

To see a full class walkthrough with diagrams and examples visit: https://ironpdf.com/tutorials/csharp-edit-pdf-complete-tutorial/#stamping-and-watermarking

StampLayer

Controls whether stamps appear above or below existing PDF content. Essential for watermarks, backgrounds, and overlay positioning.

// Watermark behind content (won't obscure text):
var watermark = new TextStamper("CONFIDENTIAL") {
    Layer = StampLayer.BehindExistingPDFContent,
    Opacity = 30
};
pdf.ApplyStamp(watermark);

// Annotation on top (covers content):
var stamp = new HtmlStamper("<div>APPROVED</div>") {
    Layer = StampLayer.OnTopOfExistingPDFContent
};
pdf.ApplyStamp(stamp);

Behind = watermarks, On top = annotations/signatures

See: https://ironpdf.com/how-to/stamping/

TextStamper

Stamps text content onto PDF pages with full styling control. Perfect for watermarks, page numbers, annotations, and dynamic text overlay.

// Simple watermark:
var watermark = new TextStamper("CONFIDENTIAL") {
    FontSize = 60,
    Color = Color.Red,
    Opacity = 30,
    Rotation = -45,
    HorizontalAlignment = HorizontalAlignment.Center,
    VerticalAlignment = VerticalAlignment.Middle
};
pdf.ApplyStamp(watermark);

// Page numbers:
var pageNum = new TextStamper("Page {page} of {total-pages}") {
    FontFamily = "Arial",
    FontSize = 10,
    VerticalAlignment = VerticalAlignment.Bottom
};
pdf.ApplyStamp(pageNum);

// Bold approval stamp:
var approved = new TextStamper("APPROVED") {
    IsBold = true,
    FontSize = 48,
    Color = Color.Green,
    BackgroundColor = Color.LightYellow
};
pdf.ApplyStamp(approved, 0);  // First page only

Supports {page} and {total-pages} merge fields

Google Fonts require UseGoogleFont = true

See: https://ironpdf.com/how-to/stamping/#text-stamper

VerticalAlignment

The vertical alignment relative to the page.