Class 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

Inheritance
System.Object
Stamper
HtmlStamper
Inherited Members
Namespace: IronPdf.Editing
Assembly: IronPdf.dll
Syntax
public class HtmlStamper : Stamper

Constructors

HtmlStamper()

Initializes a new instance of the HtmlStamper class.

Declaration
public HtmlStamper()

HtmlStamper(String)

Initializes a new instance of the HtmlStamper class.

Declaration
public HtmlStamper(string html)
Parameters
Type Name Description
System.String html

The HTML string.

HtmlStamper(String, String)

Initializes a new instance of the HtmlStamper class.

Declaration
public HtmlStamper(string html, string baseUrlString)
Parameters
Type Name Description
System.String html

The HTML string.
System.String baseUrlString

The HTML base URL for which references to external CSS, Javascript and Image files will be relative.

HtmlStamper(String, Uri)

Initializes a new instance of the HtmlStamper class.

Declaration
public HtmlStamper(string html, Uri baseUrl)
Parameters
Type Name Description
System.String html

The HTML string.
System.Uri baseUrl

The HTML base URL for which references to external CSS, Javascript and Image files will be relative.

Properties

CssMediaType

Enables Media="screen" CSS Styles and StyleSheets

Note: By setting AllowScreenCss=false, IronPdf renders Stamp from HTML using CSS for media="print" as if printing a web page in a browser print dialog.

Default value is PdfCssMediaType.Screen.

Declaration
public PdfCssMediaType CssMediaType { get; set; }
Property Value
Type Description
PdfCssMediaType

HtmlBaseUrl

The HTML base URL for which references to external CSS, Javascript and Image files will be relative.

A trick to make references relative to a your project file is 

InnerHtmlBaseUrl = new
Uri(System.Reflection.Assembly.GetEntryAssembly().Location).AbsoluteUri

Declaration
public Uri HtmlBaseUrl { get; set; }
Property Value
Type Description
System.Uri

Inherited members

AntiClockwiseRotateAlignment(HorizontalAlignment, VerticalAlignment, PdfPageRotation)
Html
Opacity
Rotation
HorizontalAlignment
VerticalAlignment
HorizontalOffset
VerticalOffset
MaxWidth
MaxHeight
MinWidth
MinHeight
Hyperlink
Scale
IsStampBehindContent
WaitFor
Timeout
IsStampAnnotation