.NET Core PDF Library

Code Samples for C#/VB .NET Core

Using Html To Create a PDF

using IronPdf;

IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();

// Render an HTML document or snippet as a string
Renderer.RenderHtmlAsPdf("<h1>Hello World</h1>").SaveAs("html-string.pdf");


// Advanced: 
// Set a "base url" or file path so that images, javascript and CSS can be loaded  
var PDF = Renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>",@"C:\site\assets\");
PDF.SaveAs("html-with-assets.pdf");

Imports IronPdf



Dim Renderer As New IronPdf.HtmlToPdf()

' Render an HTML document or snippet as a string
Renderer.RenderHtmlAsPdf("<h1>Hello World</h1>").SaveAs("html-string.pdf")


' Advanced: 
' Set a "base url" or file path so that images, javascript and CSS can be loaded  
Dim PDF = Renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>","C:\site\assets\")
PDF.SaveAs("html-with-assets.pdf")

IronPDF allows developers to create PDF documents easily in C#, F#, and VB.Net for .NET Core and .NET Framework. In this example we show that a PDF document can be rendered using HTML. You can choose simple HTML like the above, or incorporate CSS, images and Javascript. IronPDF rendering closely follows Google Chrome.

Converting a Url to a PDF

using IronPdf;

IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
Renderer.RenderUrlAsPdf("http//ironpdf.com/").SaveAs("url.pdf");



// or System.IO.MemoryStream PdfStream = PDF.GetStream;
// or byte[] PdfBinary = PDF.GetBinary;

Imports IronPdf



Dim Renderer As New IronPdf.HtmlToPdf()
Renderer.RenderUrlAsPdf("http//ironpdf.com/").SaveAs("url.pdf")



' or System.IO.MemoryStream PdfStream = PDF.GetStream;
' or byte[] PdfBinary = PDF.GetBinary;

IronPDF makes it very straightforward to render HTML from existing URLS as PDF documents. There is a very high level of support for Javascript, Images, Forms and CSS.

Rendering PDFs from ASP.NET URLS which accept query string variables can make PDF development an easy collaboration between designers and coders.

PDF Generation Settings

using IronPdf;

IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();

Renderer.PrintOptions.SetCustomPaperSizeInInches(12.5, 20);
Renderer.PrintOptions.PrintHtmlBackgrounds = true;
Renderer.PrintOptions.PaperOrientation = PdfPrintOptions.PdfPaperOrientation.Portrait;
Renderer.PrintOptions.Title = "My PDF Document Name";
Renderer.PrintOptions.EnableJavaScript = true;
Renderer.PrintOptions.RenderDelay = 50; //ms
Renderer.PrintOptions.CssMediaType = PdfPrintOptions.PdfCssMediaType.Screen;
Renderer.PrintOptions.DPI = 300;
Renderer.PrintOptions.FitToPaperWidth = true;
Renderer.PrintOptions.JpegQuality = 80;
Renderer.PrintOptions.GrayScale = false;
Renderer.PrintOptions.FitToPaperWidth = true;
Renderer.PrintOptions.InputEncoding = Encoding.UTF8;
Renderer.PrintOptions.Zoom = 100;
Renderer.PrintOptions.CreatePdfFormsFromHtml = true;

Renderer.PrintOptions.MarginTop = 40;  //millimeters
Renderer.PrintOptions.MarginLeft = 20;  //millimeters
Renderer.PrintOptions.MarginRight = 20;  //millimeters
Renderer.PrintOptions.MarginBottom = 40;  //millimeters

Renderer.PrintOptions.FirstPageNumber = 1; //use 2 if a coverpage  will be appended

Renderer.RenderHTMLFileAsPdf("my-content.html").SaveAs("my-content.pdf");

Imports IronPdf



Dim Renderer As New IronPdf.HtmlToPdf()

Renderer.PrintOptions.SetCustomPaperSizeInInches(12.5, 20)
Renderer.PrintOptions.PrintHtmlBackgrounds = True
Renderer.PrintOptions.PaperOrientation = PdfPrintOptions.PdfPaperOrientation.Portrait
Renderer.PrintOptions.Title = "My PDF Document Name"
Renderer.PrintOptions.EnableJavaScript = True
Renderer.PrintOptions.RenderDelay = 50 'ms
Renderer.PrintOptions.CssMediaType = PdfPrintOptions.PdfCssMediaType.Screen
Renderer.PrintOptions.DPI = 300
Renderer.PrintOptions.FitToPaperWidth = True
Renderer.PrintOptions.JpegQuality = 80
Renderer.PrintOptions.GrayScale = False
Renderer.PrintOptions.FitToPaperWidth = True
Renderer.PrintOptions.InputEncoding = Encoding.UTF8
Renderer.PrintOptions.Zoom = 100
Renderer.PrintOptions.CreatePdfFormsFromHtml = True

Renderer.PrintOptions.MarginTop = 40 'millimeters
Renderer.PrintOptions.MarginLeft = 20 'millimeters
Renderer.PrintOptions.MarginRight = 20 'millimeters
Renderer.PrintOptions.MarginBottom = 40 'millimeters

Renderer.PrintOptions.FirstPageNumber = 1 'use 2 if a coverpage  will be appended

Renderer.RenderHTMLFileAsPdf("my-content.html").SaveAs("my-content.pdf")

IronPDF supports many customizations for generated PDF file formats including: Paper Sizes, Document output quality, Content Scaling, CSS 'media types' and JavaScript Support.

HTML or Image File to PDF

using IronPdf;

// Create a PDF from an existing HTML using C#
 var Renderer = new IronPdf.HtmlToPdf();
 var PDF = Renderer.RenderHTMLFileAsPdf("Assets/TestInvoice1.html");
 var OutputPath = "Invoice.pdf";
 PDF.SaveAs(OutputPath);

Imports IronPdf

' Create a PDF from an existing HTML using C#


 Dim Renderer = New IronPdf.HtmlToPdf()
 Dim PDF = Renderer.RenderHTMLFileAsPdf("Assets/TestInvoice1.html")
 Dim OutputPath = "Invoice.pdf"
 PDF.SaveAs(OutputPath)

We can also render any HTML file on our hard disk.

All relative assets such as CSS, images and js will be rendered as if the file had been opened using the file:// protocol.

This method has the advantage of allowing the developer the opportunity to test the HTML content in a browser during development. We recommend Chrome as being the web browser on which IronPDF's rendering engine is based.

ASPX To PDF Settings

using IronPdf;

private void Form1_Load(object sender, EventArgs e)
{
    PdfPrintOptions PdfOptions = new PdfPrintOptions()
    {
        DPI = 300,
        EnableJavaScript = false,
        //.. many more options available
    };

AspxToPdf.RenderThisPageAsPDF(AspxToPdf.FileBehaviour.Attachment,"MyPdfFile.pdf", PdfOptions);
}

Imports IronPdf

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
	Dim PdfOptions As New PdfPrintOptions() With {
		.DPI = 300,
		.EnableJavaScript = False
	}

AspxToPdf.RenderThisPageAsPDF(AspxToPdf.FileBehaviour.Attachment,"MyPdfFile.pdf", PdfOptions)
End Sub

ASP.NET ASPX to PDF functionality allows the full set of options available when rendering HTML from a string or file, but allows adds 2 new options:
- Changing the PDF file Name
- Your PDF may be displayed directly in the web browser, or as a file download.

Image To PDF

using IronPdf;
using System.IO;
using System.Linq;

// Select one or more images.  This example selects all JPEG images in a specific folder.
var ImageFiles = Directory.EnumerateFiles(@"C:\project\assets").Where(f => f.EndsWith(".jpg") || f.EndsWith(".jpeg"));

// Convert the images to a PDF and save it.
ImageToPdfConverter.ImageToPdf(ImageFiles).SaveAs(@"C:\project\composite.pdf");
            
//Also see PdfDocument.RasterizeToImageFiles() method to flatten a PDF to images or thumbnails

Imports IronPdf
Imports System.IO
Imports System.Linq
Dim ImageFiles As var = Directory.EnumerateFiles("C:\project\assets").Where(() => {  }, (f.EndsWith(".jpg") OrElse f.EndsWith(".jpeg")))
' Convert the images to a PDF and save it.
ImageToPdfConverter.ImageToPdf(ImageFiles).SaveAs("C:\project\composite.pdf")
'Also see PdfDocument.RasterizeToImageFiles() method to flatten a PDF to images or thumbnails

PDF documents can be easily constructed from one or more image files using the IronPdf.ImageToPdfConverter Class.

Headers & Footers

using IronPdf;

IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();

// add a header to every page easily
Renderer.PrintOptions.FirstPageNumber = 1; // use 2 if a coverpage  will be appended
Renderer.PrintOptions.Header.DrawDividerLine = true;
Renderer.PrintOptions.Header.CenterText = "{url}" ;
Renderer.PrintOptions.Header.FontFamily = "Helvetica,Arial";
Renderer.PrintOptions.Header.FontSize = 12;

// add a footer too
Renderer.PrintOptions.Footer.DrawDividerLine = true;
Renderer.PrintOptions.Footer.FontFamily = "Arial";
Renderer.PrintOptions.Footer.FontSize = 10;
Renderer.PrintOptions.Footer.LeftText = "{date} {time}";
Renderer.PrintOptions.Footer.RightText = "{page} of {total-pages}";

// mergable fields are:
// {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}

Imports IronPdf
Dim Renderer As IronPdf.HtmlToPdf = New IronPdf.HtmlToPdf
' add a header to every page easily
Renderer.PrintOptions.FirstPageNumber = 1
' use 2 if a coverpage  will be appended
Renderer.PrintOptions.Header.DrawDividerLine = true
Renderer.PrintOptions.Header.CenterText = "{url}"
Renderer.PrintOptions.Header.FontFamily = "Helvetica,Arial"
Renderer.PrintOptions.Header.FontSize = 12
' add a footer too
Renderer.PrintOptions.Footer.DrawDividerLine = true
Renderer.PrintOptions.Footer.FontFamily = "Arial"
Renderer.PrintOptions.Footer.FontSize = 10
Renderer.PrintOptions.Footer.LeftText = "{date} {time}"
Renderer.PrintOptions.Footer.RightText = "{page} of {total-pages}"
' mergable fields are:
' {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}

Headers and Footers may be added to PDF documents in 2 distinct ways.
- SimpleHeaderFooter allows text based headers to be added, with the option to merge in dynamic data.
- HtmlHeaderFooter allows the developer to render HTML headers and footers to PDF files, also allowing the templating of dynamic data.

HTML Headers & Footers

using IronPdf;

IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();


// Build a footer using html to style the text
// mergable fields are:
// {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}
Renderer.PrintOptions.Footer = new HtmlHeaderFooter()
{
  Height = 15,
  HtmlFragment = "<center><i>{page} of {total-pages}<i></center>",
  DrawDividerLine = true
 };

// Build a header using an image asset
// Note the use of BaseUrl to set a relative path to the assets
Renderer.PrintOptions.Header = new HtmlHeaderFooter()
{
  Height = 20,
  HtmlFragment = "<img src='logo.png'>",
  BaseUrl = new Uri(@"C:\assets\images\").AbsoluteUri
};

Imports IronPdf
Dim Renderer As IronPdf.HtmlToPdf = New IronPdf.HtmlToPdf
' Build a footer using html to style the text
' mergable fields are:
' {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}
Renderer.PrintOptions.Footer = New HtmlHeaderFooter
' Build a header using an image asset
' Note the use of BaseUrl to set a relative path to the assets
Renderer.PrintOptions.Header = New HtmlHeaderFooter

HTML Headers and Footers are rendered as independent HTML documents which may have their own assets and stylesheets. Developers may control the Height of the rendered Header or Footer to match their content exactly.

PDF OCR & Text Extraction

//  Extracting PDF Image and Text Content
using IronPdf;
using System.Drawing;

// open a 128 bit encrypted PDF
PdfDocument PDF = PdfDocument.FromFile("encrypted.pdf", "password");

//Get all text to put in a search index
string AllText = PDF.ExtractAllText();

//Get all Images
IEnumerable<System.Drawing.Image> AllImages = PDF.ExtractAllImages();

//Or even find the precise text and images for each page in the document
for (var index = 0; index < PDF.PageCount; index++) {
    int PageNumber = index + 1;
    string Text = PDF.ExtractTextFromPage(index);
    IEnumerable<System.Drawing.Image> Images = PDF.ExtractImagesFromPage(index);
    ///...
}

'  Extracting PDF Image and Text Content
Imports IronPdf
Imports System.Drawing

' open a 128 bit encrypted PDF


Dim PDF As PdfDocument = PdfDocument.FromFile("encrypted.pdf", "password")

'Get all text to put in a search index
Dim AllText As String = PDF.ExtractAllText()

'Get all Images
Dim AllImages As IEnumerable(Of System.Drawing.Image) = PDF.ExtractAllImages()

'Or even find the precise text and images for each page in the document
For index = 0 To PDF.PageCount - 1
	Dim PageNumber As Integer = index + 1
	Dim Text As String = PDF.ExtractTextFromPage(index)
	Dim Images As IEnumerable(Of System.Drawing.Image) = PDF.ExtractImagesFromPage(index)
	'''...
Next index

IronPDF allows developers to easily extract the full text and images from almost any PDF file. This PDF OCR behavior is particularly useful when building search indexes.

Form Data

           
// Step 1.  Creating a PDF with editable forms from HTML using form and input tags

var FormHtml = @"
<html>
    <body>
        <h2>Editable PDF  Form</h2>
        <form>
          First name:<br> <input type='text' name='firstname' value=''   > <br>
          Last name:<br> <input type='text' name='lastname'  value='' >
        </form>
    </body>
</html>";

IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
Renderer.PrintOptions.CreatePdfFormsFromHtml = true;
Renderer.RenderHtmlAsPdf(FormHtml).SaveAs("BasicForm.pdf");

// Step 2. Reading and Writing PDF form values.
var FormDocument = PdfDocument.FromFile("BasicForm.pdf");

//Set and Read the value of the "firstname" field
var FirstNameField =  FormDocument.Form.GetFieldByName("firstname");
FirstNameField.Value = "Minnie";
Console.WriteLine("FirstNameField value: {0}", FirstNameField.Value);

//Set and Read the value of the "lastname" field
IronPdf.Forms.FormField LastNameField = FormDocument.Form.GetFieldByName("lastname");
LastNameField.Value = "Mouse";
Console.WriteLine("LastNameField value: {0}", LastNameField.Value);

FormDocument.SaveAs("FilledForm.pdf");

' Step 1.  Creating a PDF with editable forms from HTML using form and input tags

Dim FormHtml = "
<html>
    <body>
        <h2>Editable PDF  Form</h2>
        <form>
          First name:<br> <input type='text' name='firstname' value=''   > <br>
          Last name:<br> <input type='text' name='lastname'  value='' >
        </form>
    </body>
</html>"

Dim Renderer As New IronPdf.HtmlToPdf()
Renderer.PrintOptions.CreatePdfFormsFromHtml = True
Renderer.RenderHtmlAsPdf(FormHtml).SaveAs("BasicForm.pdf")

' Step 2. Reading and Writing PDF form values.
Dim FormDocument = PdfDocument.FromFile("BasicForm.pdf")

'Set and Read the value of the "firstname" field
Dim FirstNameField = FormDocument.Form.GetFieldByName("firstname")
FirstNameField.Value = "Minnie"
Console.WriteLine("FirstNameField value: {0}", FirstNameField.Value)

'Set and Read the value of the "lastname" field
Dim LastNameField As IronPdf.Forms.FormField = FormDocument.Form.GetFieldByName("lastname")
LastNameField.Value = "Mouse"
Console.WriteLine("LastNameField value: {0}", LastNameField.Value)

FormDocument.SaveAs("FilledForm.pdf")

PDFs with editable forms can be created from HTML simply by adding <<lform> <<linput> and <<ltextarea> tags. The PdfDocument.Form.GetFieldByName can be used to read and write the value of any form field. The name of the field will be the same as the 'name' attribute given to that field in your HTML. The PdfDocument.Form object can be used to: - Populate the default value of form fields (must be focused in Adobe Reader to display this value) - Read data from user filled PDF forms in any language.

Rasterize a PDF to Images

 //Rendering PDF documents to Images or Thumbnails
using IronPdf;
using System.Drawing;

var pdf = PdfDocument.FromFile("Example.pdf");

//Extract all pages to a folder as image files
 pdf.RasterizeToImageFiles(@"C:\image\folder\*.png");

//Dimensions and page ranges may be specified
 pdf.RasterizeToImageFiles(@"C:\image\folder\thumbnail_*.jpg", 100,80);


//Extract all pages as System.Drawing.Bitmap objects
Bitmap[] pageImages = pdf.ToBitmap();

'Rendering PDF documents to Images or Thumbnails
Imports IronPdf
Imports System.Drawing



Dim pdf = PdfDocument.FromFile("Example.pdf")

'Extract all pages to a folder as image files
 pdf.RasterizeToImageFiles("C:\image\folder\*.png")

'Dimensions and page ranges may be specified
 pdf.RasterizeToImageFiles("C:\image\folder\thumbnail_*.jpg", 100,80)


'Extract all pages as System.Drawing.Bitmap objects
Dim pageImages() As Bitmap = pdf.ToBitmap()

IronPDF allows any PDF document to be exported to image files in convenient formats or Bitmap objects. Image dimensions and page number ranges may also be specified.

Print a PDF to Paper

using IronPdf;

// Create a new PDF and print it
IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
PdfDocument Pdf =  Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");

// Send the PDF to the default printer to print
Pdf.Print();



//For advanced silent real-world printing options, use  PdfDocument.GetPrintDocument
//Remember to add an assembly reference to System.Drawing.dll
 System.Drawing.Printing.PrintDocument PrintDocYouCanWorkWith = Pdf.GetPrintDocument();

Imports IronPdf
Dim Renderer As IronPdf.HtmlToPdf = New IronPdf.HtmlToPdf
Dim Pdf As PdfDocument = Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")
' Send the PDF to the default printer to print
Pdf.Print
Dim PrintDocYouCanWorkWith As System.Drawing.Printing.PrintDocument = Pdf.GetPrintDocument

Prints this PDF by sending it to the computer's default printer. Windows print UI dialogs will be displayed to the user.

Silent and advanced printing options are exposed to the native .Net Frameowrk PrintDocument object via the PdfDocument.GetPrintDocument method. To use this method you will need to add an assembly reference to System.Drawing.dll

Editing PDFs

using IronPdf;
using System.Collections.Generic;

var Renderer = new IronPdf.HtmlToPdf();

// Join Multiple Existing PDFs into a single document
var PDFs     = new List<PdfDocument>();
PDFs.Add(PdfDocument.FromFile("A.pdf"));
PDFs.Add(PdfDocument.FromFile("B.pdf"));
PDFs.Add(PdfDocument.FromFile("C.pdf"));
PdfDocument PDF =  PdfDocument.Merge(PDFs);
PDF.SaveAs("merged.pdf");

// Add a cover page
PDF.PrependPdf(Renderer.RenderHtmlAsPdf("<h1>Cover Page</h1><hr>"));

// Remove the last page from the PDF and save again
PDF.RemovePage(PDF.PageCount - 1);
PDF.SaveAs("merged.pdf");

// Copy pages 5-7 and save them as a new document.
PDF.CopyPages(4,6).SaveAs("exerpt.pdf");

Imports IronPdf
Imports System.Collections.Generic



Dim Renderer = New IronPdf.HtmlToPdf()

' Join Multiple Existing PDFs into a single document
Dim PDFs = New List(Of PdfDocument)()
PDFs.Add(PdfDocument.FromFile("A.pdf"))
PDFs.Add(PdfDocument.FromFile("B.pdf"))
PDFs.Add(PdfDocument.FromFile("C.pdf"))
Dim PDF As PdfDocument = PdfDocument.Merge(PDFs)
PDF.SaveAs("merged.pdf")

' Add a cover page
PDF.PrependPdf(Renderer.RenderHtmlAsPdf("<h1>Cover Page</h1><hr>"))

' Remove the last page from the PDF and save again
PDF.RemovePage(PDF.PageCount - 1)
PDF.SaveAs("merged.pdf")

' Copy pages 5-7 and save them as a new document.
PDF.CopyPages(4,6).SaveAs("exerpt.pdf")

IronPDF allows many PDF file editing manipulations. The most popular are merging, cloning and extracting pages.

PDF may also be watermarked, stamped and have backgrounds and foregrounds applied.

Passwords, Security and MetaData

using IronPdf;
 


//Open an Encrypted File, alternatively create a new PDF from Html

PdfDocument Pdf = PdfDocument.FromFile("encrypted.pdf", "password");

//Edit file metadata
Pdf.MetaData.Author = "Satoshi Nakamoto";
Pdf.MetaData.Keywords = "SEO, Friendly";
Pdf.MetaData.ModifiedDate = DateTime.Now;

//Edit file security settings

//The following code makes a PDF read only and will disallow copy & paste and printing
Pdf.SecuritySettings.RemovePasswordsAndEncryption();
Pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
Pdf.SecuritySettings.AllowUserAnnotations = false;
Pdf.SecuritySettings.AllowUserCopyPasteContent = false;
Pdf.SecuritySettings.AllowUserFormData = false;
Pdf.SecuritySettings.AllowUserPrinting =  PdfDocument.PdfSecuritySettings.PdfPrintSecrity.FullPrintRights;



// chnage or set the document ecrpytion password
ExistingPdf.Password = "my-password";
Pdf.SaveAs("secured.pdf");

Imports IronPdf
Dim Pdf As PdfDocument = PdfDocument.FromFile("encrypted.pdf", "password")
'Edit file metadata
Pdf.MetaData.Author = "Satoshi Nakamoto"
Pdf.MetaData.Keywords = "SEO, Friendly"
Pdf.MetaData.ModifiedDate = DateTime.Now
'Edit file security settings
'The following code makes a PDF read only and will disallow copy & paste and printing
Pdf.SecuritySettings.RemovePasswordsAndEncryption
Pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key")
Pdf.SecuritySettings.AllowUserAnnotations = false
Pdf.SecuritySettings.AllowUserCopyPasteContent = false
Pdf.SecuritySettings.AllowUserFormData = false
Pdf.SecuritySettings.AllowUserPrinting = PdfDocument.PdfSecuritySettings.PdfPrintSecrity.FullPrintRights
' chnage or set the document ecrpytion password
ExistingPdf.Password = "my-password"
Pdf.SaveAs("secured.pdf")

Granular meta-data and security settings can be applied. This now includes the ability to limit PDF documents to be unprintable, read only and encrypted. 128 bit encryption, decryption and password protection of PDF documents is supported.

PDF Watermarking

using IronPdf;

// Stamps a watermark onto a new or existing PDF
IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
var pdf =  Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.WatermarkAllPages("<h2 style='color:red'>SAMPLE</h2>", PdfDocument.WaterMarkLocation.MiddleCenter, 50, -45, "https://www.nuget.org/packages/IronPdf");
pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");

Imports IronPdf

' Stamps a watermark onto a new or existing PDF


Dim Renderer As New IronPdf.HtmlToPdf()
Dim pdf = Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")
pdf.WatermarkAllPages("<h2 style='color:red'>SAMPLE</h2>", PdfDocument.WaterMarkLocation.MiddleCenter, 50, -45, "https://www.nuget.org/packages/IronPdf")
pdf.SaveAs("C:\Path\To\Watermarked.pdf")

IronPDF provides methods to 'watermark' PDF documents with HTML. Watermarks may be set to render above or below existing content, and have built in capacity for opacity, rotation and hyperlinks.

Adding New HTML Content

//PDFs can be edited or amended by stamping new HTML content into the foreground or background.
using IronPdf;


IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
var pdf =  Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");

var BackgroundStamp = new HtmlStamp() { Html = "<img src='logo.jpg' />", Width = 50, Height = 25, Opactity = 50, Bottom = 5,  ZIndex = HtmlStamp.StampLayer.BehindExistingPDFContent, HtmlBaseUrl = new Server.MapPath("~/assets/") };
pdf.StampHTML(BackgroundStamp);

var ForegroundStamp = new HtmlStamp() { Html = "<h2 style='color:red'>copyright 2018 ironpdf.com", Width = 50, Height = 50, Opactity = 50,  Rotation = -45,  ZIndex = HtmlStamp.StampLayer.OnTopOfExistingPDFContent };
pdf.StampHTML(ForegroundStamp);

pdf.SaveAs(@"C:\Path\To\Stamped.pdf");

'PDFs can be edited or amended by stamping new HTML content into the foreground or background.
Imports IronPdf




Dim Renderer As New IronPdf.HtmlToPdf()
Dim pdf = Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")

Dim BackgroundStamp = New HtmlStamp() With {
	.Html = "<img src='logo.jpg' />",
	.Width = 50,
	.Height = 25,
	.Opactity = 50,
	.Bottom = 5,
	.ZIndex = HtmlStamp.StampLayer.BehindExistingPDFContent,
	.HtmlBaseUrl = New Server.MapPath("~/assets/")
}
pdf.StampHTML(BackgroundStamp)

Dim ForegroundStamp = New HtmlStamp() With {
	.Html = "<h2 style='color:red'>copyright 2018 ironpdf.com",
	.Width = 50,
	.Height = 50,
	.Opactity = 50,
	.Rotation = -45,
	.ZIndex = HtmlStamp.StampLayer.OnTopOfExistingPDFContent
}
pdf.StampHTML(ForegroundStamp)

pdf.SaveAs("C:\Path\To\Stamped.pdf")

Developers may edit any PDF document by adding new content to any page (or pages) using the StampHTML method.

Backgrounds & Foregrounds

using IronPdf;

// With IronPDF, we can easily merge 2 PDF files using one as a backgorund or foreground
IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
var pdf =  Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.AddBackgroundPdf(@"MyBackground.pdf");
pdf.AddForegroundOverlayPdfToPage (0, @"MyForeground.pdf", 0);
pdf.SaveAs(@"C:\Path\To\Complete.pdf");

Imports IronPdf

' With IronPDF, we can easily merge 2 PDF files using one as a backgorund or foreground


Dim Renderer As New IronPdf.HtmlToPdf()
Dim pdf = Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")
pdf.AddBackgroundPdf("MyBackground.pdf")
pdf.AddForegroundOverlayPdfToPage(0, "MyForeground.pdf", 0)
pdf.SaveAs("C:\Path\To\Complete.pdf")

An existing or rendered PDF may be used as the Background or Foreground for another PDF document. This is particularly useful for design consistency and templating.

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Edit PDFs in .Net Core

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PM > Install-Package IronPdf Download DLL

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