Code Examples: PDF .Net Library

// Install IronPdf with Nuget: PM> Install-Package IronPdf
using IronPdf;
IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
Renderer.RenderUrlAsPdf("https://ironpdf.com/").SaveAs("url.pdf");
// or System.IO.MemoryStream PdfStream = PDF.GetStream;
// or byte[] PdfBinary = PDF.GetBinary;
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
Private Renderer As New IronPdf.HtmlToPdf()
Renderer.RenderUrlAsPdf("https://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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
using IronPdf;
var Renderer = new IronPdf.HtmlToPdf();
Renderer.RenderHtmlAsPdf("<h1>Html with CSS and Images</h1>").SaveAs("example.pdf");
// Advanced: Load external html assets: images, css and javascript.
// An optional "base" asset locating path can be set as a url or local directory.
var PDF = Renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
PDF.SaveAs("html-with-assets.pdf");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
Private Renderer = New IronPdf.HtmlToPdf()
Renderer.RenderHtmlAsPdf("<h1>Html with CSS and Images</h1>").SaveAs("example.pdf")
' Advanced: Load external html assets: images, css and javascript.
' An optional "base" asset locating path can be set as a url or local directory.
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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
Private 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.

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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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);
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
' Create a PDF from an existing HTML using C#
Private Renderer = New IronPdf.HtmlToPdf()
Private PDF = Renderer.RenderHTMLFileAsPdf("Assets/TestInvoice1.html")
Private 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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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);
}
' Install IronPdf with Nuget: PM> Install-Package IronPdf
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 adds 2 new options:
- Changing the PDF file name
- Your PDF may be displayed directly in the web browser, or as a file download.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
Imports System.IO
Imports System.Linq
' Select one or more images. This example selects all JPEG images in a specific folder.
Private ImageFiles = Directory.EnumerateFiles("C:\project\assets").Where(Function(f) 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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
Imports System.Collections.Generic
Private Renderer = New IronPdf.HtmlToPdf()
' 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"))
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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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;
//Change or set the document ecrpytion password
ExistingPdf.Password = "my-password";
Pdf.SaveAs("secured.pdf");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
'Open an Encrypted File, alternatively create a new PDF from Html
Private Pdf As PdfDocument = PdfDocument.FromFile("encrypted.pdf", "password")
'Edit file metadata
Pdf.MetaData.Author = "Satoshi Nakamoto"
Pdf.MetaData.Keywords = "SEO, Friendly"
Pdf.MetaData.ModifiedDate = Date.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
'Change 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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
' Stamps a watermark onto a new or existing PDF
Private Renderer As New IronPdf.HtmlToPdf()
Private 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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
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");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
' With IronPDF, we can easily merge 2 PDF files using one as a backgorund or foreground
Private Renderer As New IronPdf.HtmlToPdf()
Private 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.

// Install IronPdf with Nuget: 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>";
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");
' Install IronPdf with Nuget: 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>"
Private 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 <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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
using IronPdf;
using System.Drawing;
//Example rendering PDF documents to Images or Thumbnails
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();
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
Imports System.Drawing
'Example rendering PDF documents to Images or Thumbnails
Private 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.

// Install IronPdf with Nuget: PM> Install-Package IronPdf
using IronPdf;
//The quickest way to cryptographically sign an existing PDF a digital certificate
new IronPdf.PdfSignature("Iron.p12", "123456").SignPdfFile("any.pdf");
// All done in 1 line of code!
//Advanced example for more control
// Step 1. Create a PDF
IronPdf.HtmlToPdf Renderer = new IronPdf.HtmlToPdf();
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.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");
' Install IronPdf with Nuget: PM> Install-Package IronPdf
Imports IronPdf
'The quickest way to cryptographically sign an existing PDF a digital certificate
Call (New IronPdf.PdfSignature("Iron.p12", "123456")).SignPdfFile("any.pdf")
' All done in 1 line of code!
'Advanced example for more control
' Step 1. Create a PDF
Dim Renderer As New IronPdf.HtmlToPdf()
Dim 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.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")
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.

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