Try IronPDF’s .NET PDF Library

Using HTML To Create a PDF

// PM> Install-Package IronPdf
using IronPdf;

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();

// Create a PDF from a HTML string using C#
using var pdf = Renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");


/****** Advanced Example with HTML Assets ******/

// Load external html assets: images, css and javascript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from 
using var myAdvancedPdf = Renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
pdf.SaveAs("html-with-assets.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()

' Create a PDF from a HTML string using C#
Private var As using

' Export to a file or Stream
pdf.SaveAs("output.pdf")


'''**** Advanced Example with HTML Assets *****

' Load external html assets: images, css and javascript.
' An optional BasePath 'C:\site\assets\' is set as the file location to load assets from 
Using myAdvancedPdf = Renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", "C:\site\assets\")
	pdf.SaveAs("html-with-assets.pdf")
End Using

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's rendering is "pixel perfect" to desktop versions of Google Chrome.

Converting a URL to a PDF

// PM> Install-Package IronPdf
using IronPdf;

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();

// Create a PDF from a URL or local file path
using var pdf = Renderer.RenderUrlAsPdf("https://ironpdf.com/");

// Export to a file or Stream
pdf.SaveAs("url.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()

' Create a PDF from a URL or local file path
Private var As using

' Export to a file or Stream
pdf.SaveAs("url.pdf")

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.

You can download a file project from this link.

PDF Generation Settings

// PM> Install-Package IronPdf
using IronPdf;

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();

// Many rendering options to use to customize!
Renderer.RenderingOptions.SetCustomPaperSizeInInches(12.5, 20);
Renderer.RenderingOptions.PrintHtmlBackgrounds = true;
Renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape;
Renderer.RenderingOptions.Title = "My PDF Document Name";
Renderer.RenderingOptions.EnableJavaScript = true;
Renderer.RenderingOptions.RenderDelay = 50; // in milliseconds
Renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Screen;
Renderer.RenderingOptions.FitToPaperWidth = false;
Renderer.RenderingOptions.Zoom = 100;
Renderer.RenderingOptions.CreatePdfFormsFromHtml = true;

// Supports margin customization!
Renderer.RenderingOptions.MarginTop = 40;  //millimeters
Renderer.RenderingOptions.MarginLeft = 20;  //millimeters
Renderer.RenderingOptions.MarginRight = 20;  //millimeters
Renderer.RenderingOptions.MarginBottom = 40;  //millimeters

// Can set FirstPageNumber if you have a coverpage
Renderer.RenderingOptions.FirstPageNumber = 1; // use 2 if a coverpage will be appended

// Settings have been set, we can render:
Renderer.RenderHTMLFileAsPdf("assets/wikipedia.html").SaveAs("output/my-content.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()

' Many rendering options to use to customize!
Renderer.RenderingOptions.SetCustomPaperSizeInInches(12.5, 20)
Renderer.RenderingOptions.PrintHtmlBackgrounds = True
Renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape
Renderer.RenderingOptions.Title = "My PDF Document Name"
Renderer.RenderingOptions.EnableJavaScript = True
Renderer.RenderingOptions.RenderDelay = 50 ' in milliseconds
Renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Screen
Renderer.RenderingOptions.FitToPaperWidth = False
Renderer.RenderingOptions.Zoom = 100
Renderer.RenderingOptions.CreatePdfFormsFromHtml = True

' Supports margin customization!
Renderer.RenderingOptions.MarginTop = 40 'millimeters
Renderer.RenderingOptions.MarginLeft = 20 'millimeters
Renderer.RenderingOptions.MarginRight = 20 'millimeters
Renderer.RenderingOptions.MarginBottom = 40 'millimeters

' Can set FirstPageNumber if you have a coverpage
Renderer.RenderingOptions.FirstPageNumber = 1 ' use 2 if a coverpage will be appended

' Settings have been set, we can render:
Renderer.RenderHTMLFileAsPdf("assets/wikipedia.html").SaveAs("output/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.

Rendering ASPX Pages as PDFs

private void Form1_Load(object sender, EventArgs e)
{

IronPdf.AspxToPdf.RenderThisPageAsPdf();
//Changes the ASPX output into a pdf instead of HTML

}

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)

IronPdf.AspxToPdf.RenderThisPageAsPdf()
'Changes the ASPX output into a pdf instead of HTML

End Sub

Using the IronPDF library, ASP.NET web pages can be rendered to PDF instead of HTML by adding a single line of code to the Form_Load event. This allows complex PDFs to be data driven, and designed and tested as HTML first for simplicity.

HTML or Image File to PDF

 // PM> Install-Package IronPdf
using IronPdf;

// Instantiate Renderer

var Renderer = new IronPdf.ChromePdfRenderer();

// Create a PDF from an existing HTML file using C#
using var pdf = Renderer.RenderHTMLFileAsPdf("example.html");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' Instantiate Renderer

Private Renderer = New IronPdf.ChromePdfRenderer()

' Create a PDF from an existing HTML file using C#
Private var As using

' Export to a file or Stream
pdf.SaveAs("output.pdf")

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

// PM> Install-Package IronPdf
using IronPdf;


var PdfOptions = new IronPdf.Rendering.AdaptivePdfRenderOptions()
{
    CreatePdfFormsFromHtml = true,
    EnableJavaScript = false,
    Title = "My ASPX Page Rendered as a PDF"
    //.. many more options available
};

AspxToPdf.RenderThisPageAsPdf(AspxToPdf.FileBehavior.Attachment, "MyPdfFile.pdf", PdfOptions);

' PM> Install-Package IronPdf
Imports IronPdf


Private PdfOptions = New IronPdf.Rendering.AdaptivePdfRenderOptions() With {
	.CreatePdfFormsFromHtml = True,
	.EnableJavaScript = False,
	.Title = "My ASPX Page Rendered as a PDF"
}

AspxToPdf.RenderThisPageAsPdf(AspxToPdf.FileBehavior.Attachment, "MyPdfFile.pdf", PdfOptions)

ASP.NET ASPX to PDF functionality allows the full set of options available when rendering HTML from a string or file, but 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

// PM> Install-Package IronPdf
using IronPdf;
using System.IO;
using System.Linq;

// One or more images as IEnumerable. This example selects all JPEG images in a specific 'assets' folder.
var ImageFiles = System.IO.Directory.EnumerateFiles("assets").Where(f => f.EndsWith(".jpg") || f.EndsWith(".jpeg"));

// Converts the images to a PDF and save it.
ImageToPdfConverter.ImageToPdf(ImageFiles).SaveAs("composite.pdf");

// Also see PdfDocument.RasterizeToImageFiles() method to flatten a PDF to images or thumbnails

' PM> Install-Package IronPdf
Imports IronPdf
Imports System.IO
Imports System.Linq

' One or more images as IEnumerable. This example selects all JPEG images in a specific 'assets' folder.
Private ImageFiles = System.IO.Directory.EnumerateFiles("assets").Where(Function(f) f.EndsWith(".jpg") OrElse f.EndsWith(".jpeg"))

' Converts the images to a PDF and save it.
ImageToPdfConverter.ImageToPdf(ImageFiles).SaveAs("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.

You can download a file project from this link.

HTML Headers & Footers

// PM> Install-Package IronPdf
using IronPdf;

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();


// Build a footer using html to style the text
// mergable fields are:
// {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}
Renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{

	MaxHeight = 15, //millimeters
	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.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
	MaxHeight = 20, //millimeters
	HtmlFragment = "<img src='logo.png'>",
	BaseUrl = new Uri(@"C:\assets\images\").AbsoluteUri
};

' PM> Install-Package IronPdf
Imports IronPdf

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()


' Build a footer using html to style the text
' mergable fields are:
' {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}
Renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter() With {
	.MaxHeight = 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.RenderingOptions.HtmlFooter = New HtmlHeaderFooter() With {
	.MaxHeight = 20,
	.HtmlFragment = "<img src='logo.png'>",
	.BaseUrl = (New Uri("C:\assets\images\")).AbsoluteUri
}

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.

Simple Headers & Footers

// PM> Install-Package IronPdf
using IronPdf;

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();

// Add a header to every page easily
Renderer.RenderingOptions.FirstPageNumber = 1; // use 2 if a coverpage  will be appended
Renderer.RenderingOptions.TextHeader.DrawDividerLine = true;
Renderer.RenderingOptions.TextHeader.CenterText = "{url}";
Renderer.RenderingOptions.TextHeader.Font = IronPdf.Font.FontTypes.Helvetica;
Renderer.RenderingOptions.TextHeader.FontSize = 12;

// Add a footer too
Renderer.RenderingOptions.TextFooter.DrawDividerLine = true;
Renderer.RenderingOptions.TextFooter.Font = IronPdf.Font.FontTypes.Arial;
Renderer.RenderingOptions.TextFooter.FontSize = 10;
Renderer.RenderingOptions.TextFooter.LeftText = "{date} {time}";
Renderer.RenderingOptions.TextFooter.RightText = "{page} of {total-pages}";

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

' PM> Install-Package IronPdf
Imports IronPdf

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()

' Add a header to every page easily
Renderer.RenderingOptions.FirstPageNumber = 1 ' use 2 if a coverpage  will be appended
Renderer.RenderingOptions.TextHeader.DrawDividerLine = True
Renderer.RenderingOptions.TextHeader.CenterText = "{url}"
Renderer.RenderingOptions.TextHeader.Font = IronPdf.Font.FontTypes.Helvetica
Renderer.RenderingOptions.TextHeader.FontSize = 12

' Add a footer too
Renderer.RenderingOptions.TextFooter.DrawDividerLine = True
Renderer.RenderingOptions.TextFooter.Font = IronPdf.Font.FontTypes.Arial
Renderer.RenderingOptions.TextFooter.FontSize = 10
Renderer.RenderingOptions.TextFooter.LeftText = "{date} {time}"
Renderer.RenderingOptions.TextFooter.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.
- TextHeaderFooter 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. More felxible but harder to use.

Editing PDFs

// PM> Install-Package IronPdf
using IronPdf;
using System.Collections.Generic;

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();

// 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"));
using 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");

foreach (var pdf in PDFs)
{
	pdf.Dispose();
}

' PM> Install-Package IronPdf
Imports IronPdf
Imports System.Collections.Generic

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()

' Join Multiple Existing PDFs into a single document
Private PDFs = New List(Of PdfDocument)()
PDFs.Add(PdfDocument.FromFile("A.pdf"))
PDFs.Add(PdfDocument.FromFile("B.pdf"))
PDFs.Add(PdfDocument.FromFile("C.pdf"))
Using 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")
	
'INSTANT VB NOTE: The variable pdf was renamed since Visual Basic will not allow local variables with the same name as parameters or other local variables:
	For Each Me.pdf_Conflict In PDFs
		Me.pdf_Conflict.Dispose()
	Next pdf_Conflict
End Using

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

// PM> Install-Package IronPdf
using IronPdf;

//Open an Encrypted File, alternatively create a new PDF from Html
using PdfDocument Pdf = PdfDocument.FromFile("encrypted.pdf", "password");

//Edit file metadata
Pdf.MetaData.Author = "Satoshi Nakamoto";
Pdf.MetaData.Keywords = "SEO, Friendly";
Pdf.MetaData.ModifiedDate = System.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 = IronPdf.Security.PdfPrintSecurity.FullPrintRights;

//Change or set the document encrpytion password
Pdf.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
Pdf.SecuritySettings.UserPassword = "sharable";  // password to open the pdf
Pdf.SaveAs("secured.pdf");

' PM> Install-Package IronPdf
Imports System
Imports IronPdf

'Open an Encrypted File, alternatively create a new PDF from Html
Private PdfDocument As using

'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 = IronPdf.Security.PdfPrintSecurity.FullPrintRights

'Change or set the document encrpytion password
Pdf.SecuritySettings.OwnerPassword = "top-secret" ' password to edit the pdf
Pdf.SecuritySettings.UserPassword = "sharable" ' password to open the pdf
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

// PM> Install-Package IronPdf
using IronPdf;

// Stamps a Watermark onto a new or existing PDF
var Renderer = new IronPdf.ChromePdfRenderer();

using var Pdf = Renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
Pdf.WatermarkAllPages("<h2 style='color:red'>SAMPLE</h2>", IronPdf.Editing.WaterMarkLocation.MiddleCenter, 50, -45, "https://www.nuget.org/packages/IronPdf");
Pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' Stamps a Watermark onto a new or existing PDF
Private Renderer = New IronPdf.ChromePdfRenderer()

Private var As using
Pdf.WatermarkAllPages("<h2 style='color:red'>SAMPLE</h2>", IronPdf.Editing.WaterMarkLocation.MiddleCenter, 50, -45, "https://www.nuget.org/packages/IronPdf")
Pdf.SaveAs("C:\Path\To\Watermarked.pdf")

Are you looking for how to add a watermark to pdf documents pragmatically using C# .NET platform?

First, take look at "what a watermark is and why it is important". A watermark is a word or picture that appears in the foreground and background of existing text documents, similar to a stamp, in a PDF. You may, for example, use a "Confidential" watermark on pages that contain sensitive information.

IronPDF can provide the perfect solution to all of your PDF document watermarking needs, like the need to add watermark images to a pdf document on single pages, or on multiple pages, and also provides support if you need to add a watermark to pdf files as a whole.

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.

You can download a file project from this link.

Best .NET Library for Adding Text and Image Watermark to PDF

IronPDF has the market-leading .NET library for PDF file watermarking. IronPDF makes it easy for developers to add both text and image-based watermarks to PDF pages. To add watermark images to a PDF file, IronPDF allows its users multiple options to manipulate watermarks in the PDF file.

watermark single page
watermark all the pages
watermark text pages of your choice
adjust watermark location
adjust watermark position

Why use IronPDF for Adding Watermark to PDF File

IronPDF leads the PDF industry and offers all types of PDF manipulating and formatting features. Using IronPDF you can add PDF watermarks to new documents as well as existing pdf files.

Are you are worried about how to add a text watermark or an image watermark to a PDF file using the .NET platform?

With only a few lines of code, IronPDF handles the watermarking process, and also allows users to add an image watermark from different image formats like PNG and PNGP, and many more.

Steps To Add Watermark in PDF file

Download and install the IronPDF library.
Create a new document or use an existing pdf file.
Copy from the code snippet or write simple code in the static void main method.
Then run the application to check the output PDF file with the watermark.

IronPDF Capabilities

IronPDF .NET library features all the PDF-related textual solutions whether you want to customize font, add a text watermark, read PDF files using string, add a cover page in place of a first page, and all the PDF specification effects.

IronPDF support nearly all the operating system compatible with PDF out there. IronPDF allows its developer to have royal control in formatting PDFs. IronPDF supports a lot of images formats like BMP, JPEG, GIF, PNG, and TIFF Files. you can also read and save PDF files with just a single line of code.

About IronSuite

The IronSuite is a bundle of state-of-the-art products from Iron Software. The suite includes 5 leading digital solutions tools:

IronPDF
IronOCR
IronBarCode
IronXL
IronWebScraper

You can purchase all the five Iron Software products for the price of just two licenses. Iron Software's clientele is based on the fortune of 500 companies, including some big names like NASA and LEGO.

Backgrounds & Foregrounds

// PM> Install-Package IronPdf
using IronPdf;

// With IronPDF, we can easily merge 2 PDF files using one as a background or foreground
var Renderer = new IronPdf.ChromePdfRenderer();
using 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");

' PM> Install-Package IronPdf
Imports IronPdf

' With IronPDF, we can easily merge 2 PDF files using one as a background or foreground
Private Renderer = New IronPdf.ChromePdfRenderer()
Private var As using
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.

How add a Background (or overlay) to a PDF in C#

Load or create a multi-page PDF as an IronPdf.PdfDocument object.
You can add backgrounds using PdfDocument.AddBackgroundPdf. There are several background insertion methods and overrides in the IronPdf.PdfDocument documentation
You can add Foregrounds also known as "Overlays" using PdfDocument.AddForegroundOverlayPdfToPage. There are several foreground insertion methods and overrides in the IronPdf.PdfDocument documentation
Save the PDF to disk, or serve it as a FileActionResult via MVC.

Form Data

// PM> Install-Package IronPdf
using IronPdf;

// 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>";

// Instantiate Renderer
var Renderer = new IronPdf.ChromePdfRenderer();
Renderer.RenderingOptions.CreatePdfFormsFromHtml = true;
Renderer.RenderHtmlAsPdf(FormHtml).SaveAs("BasicForm.pdf");

// Step 2. Reading and Writing PDF form values.
using 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");

' PM> Install-Package IronPdf
Imports IronPdf

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

Private 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>"

' Instantiate Renderer
Private Renderer = New IronPdf.ChromePdfRenderer()
Renderer.RenderingOptions.CreatePdfFormsFromHtml = True
Renderer.RenderHtmlAsPdf(FormHtml).SaveAs("BasicForm.pdf")

' Step 2. Reading and Writing PDF form values.
Using 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")
End Using

PDFs with editable forms can be created from HTML simply by adding <form>, <input>, and <textarea> 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

// PM> Install-Package IronPdf
using IronPdf;
using System.Drawing;

//Example rendering PDF documents to Images or Thumbnails

using 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
System.Drawing.Bitmap[] pageImages = Pdf.ToBitmap();

' PM> Install-Package IronPdf
Imports IronPdf
Imports System.Drawing

'Example rendering PDF documents to Images or Thumbnails

Private var As using

'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 System.Drawing.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.

Digitally Sign a PDF

// PM> Install-Package IronPdf
using IronPdf;

// Cryptographically sign an existing PDF in 1 line of code!
new IronPdf.Signing.PdfSignature("Iron.p12", "123456").SignPdfFile("any.pdf");


/***** Advanced example for more control *****/

// Step 1. Create a PDF
var Renderer = new IronPdf.ChromePdfRenderer();
using PdfDocument doc = Renderer.RenderHtmlAsPdf("<h1>Testing 2048 bit digital security</h1>");

// Step 2. Create a Signature.
// You may create a .pfx or .p12 PDF signing certificate using Adobe Acrobat Reader. 
// Read: https://helpx.adobe.com/acrobat/using/digital-ids.html

var signature = new IronPdf.Signing.PdfSignature("Iron.pfx", "123456");

// Step 3. Optional signing options and a handwritten signature graphic
signature.SigningContact = "support@ironsoftware.com";
signature.SigningLocation = "Chicago, USA";
signature.SigningReason = "To show how to sign a PDF";
signature.LoadSignatureImageFromFile("handwriting.png");

//Step 4. Sign the PDF with the PdfSignature. Multiple signing certificates may be used
doc.SignPdfWithDigitalSignature(signature);

//Step 4. The PDF is not signed until saved to file, steam or byte array.
doc.SaveAs("signed.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' Cryptographically sign an existing PDF in 1 line of code!
Call (New IronPdf.Signing.PdfSignature("Iron.p12", "123456")).SignPdfFile("any.pdf")


'''*** Advanced example for more control ****

' Step 1. Create a PDF
Dim Renderer = New IronPdf.ChromePdfRenderer()
Using doc As PdfDocument = Renderer.RenderHtmlAsPdf("<h1>Testing 2048 bit digital security</h1>")
	
	' Step 2. Create a Signature.
	' You may create a .pfx or .p12 PDF signing certificate using Adobe Acrobat Reader. 
	' Read: https://helpx.adobe.com/acrobat/using/digital-ids.html
	
	Dim signature = New IronPdf.Signing.PdfSignature("Iron.pfx", "123456")
	
	' Step 3. Optional signing options and a handwritten signature graphic
	signature.SigningContact = "support@ironsoftware.com"
	signature.SigningLocation = "Chicago, USA"
	signature.SigningReason = "To show how to sign a PDF"
	signature.LoadSignatureImageFromFile("handwriting.png")
	
	'Step 4. Sign the PDF with the PdfSignature. Multiple signing certificates may be used
	doc.SignPdfWithDigitalSignature(signature)
	
	'Step 4. The PDF is not signed until saved to file, steam or byte array.
	doc.SaveAs("signed.pdf")
End Using

IronPDF has options to digitally sign new or existing PDF files using .pfx and .p12 X509Certificate2 digital certificates.

Once a PDF is signed, it can not be modified without the certificate being invalidated. This ensures fidelity.

To generate a signing certificate for free using Adobe Reader, please read https://helpx.adobe.com/acrobat/using/digital-ids.html

In addition to cryptographic signing, a hand written signature image or company stamp image may also be used to sign using IronPDF.

You can download a file project from this link.

What Is IronPDF for .NET?

Our .NET PDF Library solution is a dream for developers, especially software engineers who use C#. You can easily create a core pdf library for .NET.

IronPDF uses a .NET Chromium engine to render HTML pages to PDF files. There's no need to use complex APIs to position or design PDFs. IronPDF supports standard web documents HTML, ASPX, JS, CSS, and images.

It enables you to create a .NET PDF library using HTML5, CSS, Javascript, and also images. You can edit, stamp, and add headers and footers to a PDF effortlessly. It also makes it easy to read PDF text and extract images!

Get Started

.NET PDF Library Features Using IronPDF

We’ve never seen a more accurate HTML to PDF converter! Our industry-leading PDF library has so many features and a rendering engine that enables heedlessness and embeddability in the Chrome / Webkit. No installation is required.

Create

Create PDF documents from HTML 4 and 5, CSS, and JavaScript
Generate PDF documents from URL
Load URL with custom network login credentials, UserAgents, Proxies, Cookies, HTTP headers, form variables allowing login behind HTML login forms
- Supports mainstream icon fonts (Fontello, Bootstrap, FontAwesome)
- Load external stylesheets and assets (HTTP, HTTPS, or filesystem) programmatically
Single and Multithreaded rendering
Custom ISO paper size with customizable orientations, margins, and color component

Edit Existing PDF Documents without Adobe Acrobat

Read and fill form fields data
Extract images and texts from PDF
Add, edit, update outlines and bookmarks, program annotations with sticky notes
Add foreground or background overlays from HTML or PDF assets
Stamp new HTML Content onto any existing PDF page
Add logical or HTML headers and footers

Manipulate Existing PDF Documents

Load and parse existing PDF documents
Merge and split content in pdf document
Add headers, footers, annotations, bookmarks, watermarks, text, and image assets
Add stamp and watermarks with text, images, and HTML backgrounds
Rotate pages

Convert from Multiple Formats

Images to a PDF file – convert from mainstream image document, with a single line code, JPG, PNG, GIF, BMP, TIFF, system drawing, and SVG to PDF
ASPX WebForms – convert, with 3 lines of code, ASP.NET webforms to downloadable PDFs viewable in the browser
HTML Document – convert HTML to PDF
Custom ‘base URL’ to allow accessible asset files across the web
Responsive layouts through Virtual Viewport (Width and Height)
Custom zoom with scalable:
- HTML content to dimensions that preserves the quality
- Output resolution in DPI
Embed System Drawing image assets into HTML strings with ImagetoDataURI
Enable Javascript support including optional Render delays
Accept HTML encoded in any major file encoding (Default to UTF-8)

Export

MVC Views – export ASP.NET MVC views as PDF
Merge pages and images
Export files to any format with supported fonts

Save

Save and load from file, binary data, or MemoryStreams.

Secure

Improve security with options to update user passwords, metadata, security permissions, and verifiable digital signatures

Print

Screen or Print CSS media types
Turn PDF files into a PrintDocument object and print without Adobe (with minimal code)

See the Features

Everything you need in PDF documents

Creating, merging, splitting, editing, and manipulating PDF files whenever you want them, the way you want them is a breeze. Use your C# development skills to tap into IronPDF’s expanding features list.

To begin working on a project with IronPDF, download the free Nuget Package Installer or directly download the DLL. You can then proceed to create PDF document, edit and manipulate existing file formats, or export to any format without adobe acrobat.

Our support extends from a free and exhaustive range of tutorials to 24/7 live support.

Get Started with IronPDF

HTML, Javascript, CSS and Image Conversion to PDF in .NET Applications.

Design with Familiar HTML Documents

IronPDF lets you work with mainstream HTML document formats and turn it into PDF in ASP.NET web applications. Apply multiple settings including setting file behavior and names, adding headers and footers, changing print options, adding page breaks, combining async and multithreading, and more.

Similarly you can convert C# MVC HTML to PDF for ASP .NET Applications, print MVC view to return PDF file format, supported with HTML, CSS, Javascript and images.

In addition, create PDF documents and convert a present HTML page to PDF in ASP .NET C# applications and websites (C# html-to-pdf converter). The rich HTML is used as the PDF content with the ability to edit and manipulate with IronPDF's generate feature.

With IronPDF, worrying about resolutions is an issue from the past. The output PDF documents from IronPdf are pixel identical to the PDF functionality in the Google Chrome web browser.

Made for .Net, C#, VB, MVC, ASPX, ASP.NET, .NET Core

Get Started in Minutes

Simple Installation <br/>for Visual Studio

Try It With NuGet Now

The benefits are clear! With IronPDF, you can do so much more, so much easier. Our product is perfect for anyone who needs to make, manage and edit a library of PDFs, including businesses in real estate, publishing, finance, and enterprise. The prices of our solution are also very competitive.

Ready to see what IronPDF can do for your projects and business? Try it out now

Install with Nuget for .Net Download Now