How to Add PDF Stamper in C#

How to Stamp Text & Image on PDFs

1. Download the C# library to stamp text and images.
2. Create and configure the desired stamper class.
3. Use the 'ApplyStamp' method to apply the stamp to the PDF.
4. Apply multiple stamps using the 'ApplyMultipleStamps' method.
5. Specify particular pages to apply the stamps to.

Configuring and Applying Text Stamps in PDFs

First, create an object from the TextStamper class to support text stamping in PDFs. The object of this class contains all the configurations to specify how the text stamper is presented. Pass the textStamper object to the 'ApplyStamp' method. The Text property defines the content to be displayed on the PDF.

Furthermore, it is possible to specify font family, font styling, as well as the location of the Stamp. This customization extends to interactive elements, file descriptions, and existing content on the same or other PDFs. Then, export the PDF with the actual file name.

On completing the configurations, export the output PDF file with the designated file name, encapsulating all settings and providing a professional touch to your documents.

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create a TextStamper object and configure its properties
TextStamper textStamper = new TextStamper()
{
    Text = "Text Stamper!",
    FontFamily = "Bungee Spice",
    UseGoogleFont = true,
    FontSize = 30,
    IsBold = true,
    IsItalic = true,
    VerticalAlignment = VerticalAlignment.Top,
};

// Apply the text stamp to the PDF document
pdf.ApplyStamp(textStamper);

// Save the modified PDF document
pdf.SaveAs("stampText.pdf");

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create a TextStamper object and configure its properties
TextStamper textStamper = new TextStamper()
{
    Text = "Text Stamper!",
    FontFamily = "Bungee Spice",
    UseGoogleFont = true,
    FontSize = 30,
    IsBold = true,
    IsItalic = true,
    VerticalAlignment = VerticalAlignment.Top,
};

// Apply the text stamp to the PDF document
pdf.ApplyStamp(textStamper);

// Save the modified PDF document
pdf.SaveAs("stampText.pdf");

Configuring and Applying Image Stamps in PDF

Similar to the text stamper, create an object from the ImageStamper class and then use the ImageStamper Apply Method to apply the image to the document. This method's second parameter also accommodates a page index, enabling the stamp application to single or multiple pages. This specific instance can instruct the system to apply the image as a stamp, particularly on the first page of the PDF.

All page indexes follow zero-based indexing.

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create an ImageStamper object with the image URL
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
    VerticalAlignment = VerticalAlignment.Top,
};

// Apply the image stamp to the first page of the PDF document
pdf.ApplyStamp(imageStamper, 0);

// Save the modified PDF document
pdf.SaveAs("stampImage.pdf");

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create an ImageStamper object with the image URL
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
    VerticalAlignment = VerticalAlignment.Top,
};

// Apply the image stamp to the first page of the PDF document
pdf.ApplyStamp(imageStamper, 0);

// Save the modified PDF document
pdf.SaveAs("stampImage.pdf");

Apply Multiple Stamps

To add multiple stamps to a document, use the method for Applying Multiple Stamps in IronPDF by passing an array of stampers. It lets you add various elements, like text, images, or labels, all in one go. Two text stampers were created with different text and alignments in this example, the pdf.ApplyMultipleStamps applies both stamps to the PDF, and the final document is saved as multipleStamps.pdf. This method streamlines the process of adding various stamps, providing a convenient way to enhance your PDF with multiple elements, whether on the same page, another PDF, or even a blank page.

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create two TextStamper objects with different configurations
TextStamper stamper1 = new TextStamper()
{
    Text = "Text stamp 1",
    VerticalAlignment = VerticalAlignment.Top,
    HorizontalAlignment = HorizontalAlignment.Left,
};

TextStamper stamper2 = new TextStamper()
{
    Text = "Text stamp 2",
    VerticalAlignment = VerticalAlignment.Top,
    HorizontalAlignment = HorizontalAlignment.Right,
};

// Add the stampers to an array
Stamper[] stampersToApply = { stamper1, stamper2 };

// Apply multiple stamps to the PDF document
pdf.ApplyMultipleStamps(stampersToApply);

// Save the modified PDF document
pdf.SaveAs("multipleStamps.pdf");

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create two TextStamper objects with different configurations
TextStamper stamper1 = new TextStamper()
{
    Text = "Text stamp 1",
    VerticalAlignment = VerticalAlignment.Top,
    HorizontalAlignment = HorizontalAlignment.Left,
};

TextStamper stamper2 = new TextStamper()
{
    Text = "Text stamp 2",
    VerticalAlignment = VerticalAlignment.Top,
    HorizontalAlignment = HorizontalAlignment.Right,
};

// Add the stampers to an array
Stamper[] stampersToApply = { stamper1, stamper2 };

// Apply multiple stamps to the PDF document
pdf.ApplyMultipleStamps(stampersToApply);

// Save the modified PDF document
pdf.SaveAs("multipleStamps.pdf");

Specifying Stamp Location on PDF Document

To define the placement of the Stamp, utilize a 3x3 grid with three horizontal columns and three vertical rows. You have choices for horizontal alignment: left, center, and right, and vertical alignment: top, middle, and bottom. You can adjust horizontal and vertical offsets for added precision for each position. Please refer to the image below for a visual representation of this concept.

PDF stamper positioning

• HorizontalAlignment: The horizontal alignment of the Stamp relative to the page.
• VerticalAlignment: The vertical alignment of the Stamp relative to the page.
• HorizontalOffset: The horizontal offset. The default value is 0, and the default unit is IronPdf.Editing.MeasurementUnit.Percentage. Positive values indicate an offset to the right, while negative values indicate an offset to the left.
• VerticalOffset: The vertical offset. The default value is 0, and the default unit is IronPdf.Editing.MeasurementUnit.Percentage. Positive values indicate an offset downward, while negative values indicate an offset upward.

To specify the HorizontalOffset and VerticalOffset properties, instantiate the Specified Length Class for detailed measurement. The default measurement unit for Length is a percentage, but it can also use measurement units such as inches, millimeters, centimeters, pixels, and points.

using IronPdf.Editing;

// Create an ImageStamper object with an image URL
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
    HorizontalAlignment = HorizontalAlignment.Center,
    VerticalAlignment = VerticalAlignment.Top,

    // Specify offsets for precise positioning
    HorizontalOffset = new Length(10), // 10% offset to the right
    VerticalOffset = new Length(10), // 10% offset downward
};

using IronPdf.Editing;

// Create an ImageStamper object with an image URL
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
    HorizontalAlignment = HorizontalAlignment.Center,
    VerticalAlignment = VerticalAlignment.Top,

    // Specify offsets for precise positioning
    HorizontalOffset = new Length(10), // 10% offset to the right
    VerticalOffset = new Length(10), // 10% offset downward
};

Configuring and Applying HTML Stamps in PDF

There is another stamper class that can be used to stamp both text and images. The HtmlStamper Class for HTML Integration can render HTML designs with CSS styling and stamp them onto the PDF document. The InnerHtmlBaseUrl property is used to specify the base URL for the HTML string assets, such as CSS and image files.

The HtmlStamper class is applied to the PDF. This stamper object includes an image and text, and you can define these in the HTML fragment which is to be stamped onto your PDF. All external references to JavaScript, CSS, and image files will be relative to the inner Html property. This code allows you to customize the PDF according to specific file specifications mentioned in the HTML content. Lastly, the modified PDF is saved with the filename 'stampHtml.pdf.'

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create an HtmlStamper object and configure its properties
HtmlStamper htmlStamper = new HtmlStamper()
{
    Html = @"<img src='https://ironpdf.com/img/svgs/iron-pdf-logo.svg'>
    <h1>Iron Software</h1>",
    VerticalAlignment = VerticalAlignment.Top,
};

// Apply the HTML stamp to the PDF document
pdf.ApplyStamp(htmlStamper);

// Save the modified PDF document
pdf.SaveAs("stampHtml.pdf");

using IronPdf;
using IronPdf.Editing;

// Initialize the PDF renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Create a PDF document from HTML content
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create an HtmlStamper object and configure its properties
HtmlStamper htmlStamper = new HtmlStamper()
{
    Html = @"<img src='https://ironpdf.com/img/svgs/iron-pdf-logo.svg'>
    <h1>Iron Software</h1>",
    VerticalAlignment = VerticalAlignment.Top,
};

// Apply the HTML stamp to the PDF document
pdf.ApplyStamp(htmlStamper);

// Save the modified PDF document
pdf.SaveAs("stampHtml.pdf");

Conclusion

In conclusion, IronPDF's Stamper Functionality provides a versatile and user-friendly solution for enhancing PDF documents. Whether adding simple text labels, incorporating images, or leveraging the power of HTML and CSS with the HTMLStamper, IronPDF caters to a wide range of customization needs.

The ease of use and practical examples showcasing the application of text and image stamps make it accessible for users with varying technical expertise. The stamper options, including opacity, rotation, and scale, contribute to a comprehensive toolkit for users seeking to customize PDFs effortlessly. IronPDF's stamper feature stands out as a reliable and efficient tool, empowering users to easily elevate their PDF documents.

Essentially, Mastering PDF Enhancements with IronPDF effortlessly elevates PDFs for both basic and advanced needs including Extracting Embedded Texts and Images, Handling PDF Forms with Ease, Efficient Merging or Splitting of PDF Files, and Formatting PDFs with Custom Headers and Footers programmatically. For inquiries or feature requests, IronPDF Support Team is ready to assist.