ASPX & ASP.NET Code Samples

ASPX and .NET: Save ASPX Page as PDF Save ASPX Page as PDF 
using IronPdf;

private void Form1_Load(object sender, EventArgs e)
{
    //Changes the ASPX output into a pdf instead of HTML
    IronPdf.AspxToPdf.RenderThisPageAsPdf();
}

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 example shows how IronPDF can produce complex, data-driven PDFs that are designed and tested as HTML first for simplicity.

IronPDF's ASPX to PDF Conversion functionality allows you to call a single method within an ASPX page and have it return a PDF instead of HTML.

You can code the PDF to either display "in-browser," or to behave as a file download.

ASPX and .NET: ASPX To PDF Settings ASPX To PDF Settings 
using IronPdf;

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

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

This example demonstrates how the user can change PDF print options to turn form into HTML.

IronPDF's ASPX to PDF Conversion Guide functionality has many options available for rendering HTML to PDF from a string or a file.

Two options of particular importance are:

  • Allowing developers to specify if HTML forms should be rendered as interactive PDF forms during conversion.
  • Allowing developers to specify if the PDF should be displayed "in browser," or as a file download.

ASPX and .NET: Using HTML To Create a PDF Using HTML To Create a PDF 
using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
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
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

With IronPDF, you can create new PDF documents from simple HTML strings within your .NET project, and IronPDF is able to be used in C#, F#, and VB.NET. Thanks to the use of the ChromePdfRenderer class, you can be sure that any PDF documents you render from HTML string will come out pixel-perfect. With IronPDF's powerful HTML to PDF conversion features, you create high-quality PDF files tailored to fit your personal needs.

The 4 Steps to Converting HTML String to PDF

  1. Import the IronPDF library.
  2. Initialize a new ChromePdfRenderer Object.
  3. Use the ChromePdfRenderer.RenderHtmlAsPdf method.
  4. Save the PDF using PdfDocument.SaveAs.

See the code example below for more details:

using IronPdf;
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
pdf.SaveAs("output.pdf");
using IronPdf;
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
pdf.SaveAs("output.pdf");

The first step to converting HTML string to PDF in C# is ensuring that you have the IronPDF library properly set up and working within your project. By including using IronPdf, we are making sure we can access the classes needed from the IronPDF library to carry out HTML to PDF conversion. Once this is done, the next line, Installation.EnableWebSecurity = true is used to disable local disk access or cross-origin requests, ensuring secure operations.

This next line creates a new ChromePdfRenderer instance, which will handle the conversion of HTML to PDF. In the basic example, the RenderHtmlAsPdf method is used to convert a simple HTML string ("<h1>Hello World</h1>") into a PDF document, which is saved to the disk using the SaveAs method.

In the advanced method, we demonstrate how IronPDF can handle HTML content containing external assets such as images, CSS, and JavaScript. To load these assets, the optional BasePath parameter is used, which specifies the directory containing the required files. The resulting PDF, which includes the external assets, is saved using the same SaveAs method as seen in the basic example. This code example highlights IronPDF's ability to handle both basic and complex HTML content, making it an efficient tool for generating PDFs programmatically.

For more examples, check the How-to Guide on using IronPDF with C#.

ASPX and .NET: Converting a URL to a PDF Converting a URL to a PDF 
using IronPdf;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

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

// 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 that accept query string variables can facilitate smooth PDF development as a collaborative effort between designers and coders.

Steps to Convert URL to PDF in C#

  1. Download the IronPDF URL to PDF Conversion Library
  2. Install the library with NuGet to test its features
  3. Render PDFs from ASP.NET URLs that accept query string variables using IronPDF
  4. Create a PDF document directly from a URL with IronPDF
  5. View and validate your PDF output document easily.

ASPX and .NET: HTML or Image File to PDF HTML or Image File to PDF 
using IronPdf;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

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

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

IronPDF is a powerful .NET library capable of converting HTML files into high-quality PDF files. With IronPDF, you can render HTML files to PDF in just a couple of lines, and thanks to its support for modern web standards, the resulting PDF files will come out pixel-perfect. Leveraging IronPDF's powerful HTML file to PDF feature is easy thanks to its use of the ChromePdfRenderer class, which handles the conversion of HTML to PDF with ease.

Steps to Convert HTML Files to PDF with IronPDF

  1. Install the C# IronPDF library to convert HTML to PDF
  2. using IronPdf;
  3. var renderer = new ChromePdfRenderer();
  4. var pdf = renderer.RenderHtmlFileAsPdf("example.html");
  5. pdf.SaveAs("output.pdf");

This code creates a new PDF file that has been rendered from an HTML file. To do this, we must first ensure that the IronPDF library is installed and included within your project through the using IronPdf line. Next, initialize the ChromePdfRenderer class, which provides the functionality to render HTML content as a PDF, this class ensures that the original quality of the HTML file is not lost in the conversion process.

Once the renderer is instantiated, you can convert an existing HTML file into a PDF using the RenderHtmlAsPdf method. In this example, the HTML file "example.html" is passed to the method, creating a PDF object. Finally, to save the generated PDF, use the SaveAs method, specifying the desired file name and location. This simple process allows you to easily generate PDFs from HTML files in your C# applications.

Click here to view the How-to Guide, including examples, sample code, and files

ASPX and .NET: PDF Generation Settings PDF Generation Settings 
using IronPdf;
using IronPdf.Engines.Chrome;

// Instantiate Renderer
var renderer = new 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.WaitFor.RenderDelay(50); // in milliseconds
renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Screen;
renderer.RenderingOptions.FitToPaperMode = FitToPaperModes.Zoom;
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 cover page
renderer.RenderingOptions.FirstPageNumber = 1; // use 2 if a cover page will be appended

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

IronPDF aims to be as flexible as possible for the developer.

In this C# PDF Generation Tutorial Example, we show the balance between providing an API that automates internal functionality and providing one that gives you control.

IronPDF supports many customizations for generated PDF files, including: page sizing, page margins, header/footer content, content scaling, CSS rulesets, and JavaScript execution.

We want developers to be able to control how Chrome turns a web page into a PDF. The ChromePdfRenderer Class Overview makes this possible.

Examples of settings available on the ChromePDFRenderOptions class include settings for margins, headers, footers, paper size, and form creation.

ASPX and .NET: Image To PDF Image To PDF 
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 = 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

Construct a PDF from one or more image files using the IronPdf.ImageToPdfConverter class.

How to Convert an Image to a PDF in C#

Given a single image located on a computer at C:\images\example.png, we can convert it quickly into a PDF document by calling the IronPdf.ImageToPdfConverter.ImageToPdf method with its file path:

IronPdf.ImageToPdfConverter.ImageToPdf(@"C:\images\example.png").SaveAs("example.pdf");
IronPdf.ImageToPdfConverter.ImageToPdf(@"C:\images\example.png").SaveAs("example.pdf");

Combine Multiple Images Into a PDF File

We can also convert images to PDFs in batch into a single PDF document using System.IO.Directory.EnumerateFiles along with ImageToPdfConverter.ImageToPdf:

string sourceDirectory = "D:\web\assets";
string destinationFile = "JpgToPDF.pdf";
var imageFiles = Directory.EnumerateFiles(sourceDirectory, "*.jpg");
ImageToPdfConverter.ImageToPdf(imageFiles).SaveAs(destinationFile);
string sourceDirectory = "D:\web\assets";
string destinationFile = "JpgToPDF.pdf";
var imageFiles = Directory.EnumerateFiles(sourceDirectory, "*.jpg");
ImageToPdfConverter.ImageToPdf(imageFiles).SaveAs(destinationFile);

Explore more about converting images to PDFs using IronPDF to enhance your applications, or visit the Iron Software website to discover the entire suite of developer tools offered by Iron Software, including IronBarcode, IronOCR, and more.

ASPX and .NET: Headers & Footers Headers & Footers 
using IronPdf;

// Initiate PDF Renderer
var renderer = new ChromePdfRenderer();

// Add a header to every page easily
renderer.RenderingOptions.FirstPageNumber = 1; // use 2 if a cover page  will be appended
renderer.RenderingOptions.TextHeader.DrawDividerLine = true;
renderer.RenderingOptions.TextHeader.CenterText = "{url}";
renderer.RenderingOptions.TextHeader.Font = IronSoftware.Drawing.FontTypes.Helvetica;
renderer.RenderingOptions.TextHeader.FontSize = 12;
renderer.RenderingOptions.MarginTop = 25; //create 25mm space for header

// Add a footer too
renderer.RenderingOptions.TextFooter.DrawDividerLine = true;
renderer.RenderingOptions.TextFooter.Font = IronSoftware.Drawing.FontTypes.Arial;
renderer.RenderingOptions.TextFooter.FontSize = 10;
renderer.RenderingOptions.TextFooter.LeftText = "{date} {time}";
renderer.RenderingOptions.TextFooter.RightText = "{page} of {total-pages}";
renderer.RenderingOptions.MarginTop = 25; //create 25mm space for footer

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

Headers and Footers may be added to PDF documents in two distinct ways.

  • Classic text headers and footers, which allow text-based headers to be added, with the option to merge in dynamic data.
  • HTML headers and footers with IronPDF, which allow the developer to render HTML headers and footers to PDF files, also facilitating the templating of dynamic data. This method is more flexible, although it is harder to use.

The class TextHeaderFooter in IronPDF defines PDF headers and footers display options. This uses a logical approach to rendering headers and footers for the most common use cases.

In this example, we show you how to add classic text headers and footers to your PDF documents in IronPDF.

When adding headers and footers to your document, you have the option to set the headers text to be centered on the PDF document. You can also merge metadata into your header using placeholder strings. You can find these placeholder strings in the TextHeaderFooter API Documentation. You can also add a horizontal line divider between the headers or footers and the page content on every page of the PDF document, influence font and font sizes, etc. It is a very useful feature that ticks all the boxes.

ASPX and .NET: HTML Headers & Footers HTML Headers & Footers 
using IronPdf;
using System;

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


// Build a footer using html to style the text
// mergeable 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
};

// Use sufficient MarginBottom to ensure that the HtmlFooter does not overlap with the main PDF page content.
renderer.RenderingOptions.MarginBottom = 25; //mm


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

// Use sufficient MarginTop to ensure that the HtmlHeader does not overlap with the main PDF page content.
renderer.RenderingOptions.MarginTop = 25; //mm

The HTML headers and footers are rendered as independent HTML documents which may have their own assets and stylesheets. It gives developers total control over how their headers and footers look. The height of the rendered headers or footers can be controlled to match their content exactly.

In this example, we show how to add HTML headers and footers to your PDF documents in IronPDF.

HTML headers or footers will be printed onto every page of the PDF when you add them to your project. This can be used to override IronPDF classic headers and footers examples.

When using HtmlHeaderFooter, it is important to set HtmlFragment, which will be used to render the headers or footers. It should be an HTML snippet rather than a complete document. It may also contain styles & images.

You can also merge meta-data into your HTML using any of these placeholder strings such as {page} {total-pages} {url} {date} {time} {html-title} {pdf-title}.

ASPX and .NET: Editing PDFs Editing PDFs 
using IronPdf;
using System.Collections.Generic;

// Instantiate Renderer
var renderer = new 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"));
var 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("excerpt.pdf");

foreach (var eachPdf in pdfs)
{
    eachPdf.Dispose();
}

IronPDF offers 50+ features for reading and editing PDFs. The most popular are merging PDFs, cloning pages, and extracting text from rotated content.

IronPDF also allows its users to add watermarks, rotate pages, add annotations, digitally sign PDF pages, create new PDF documents, attach cover pages, customize PDF sizes, and much more when generating and formatting PDF files. Moreover, it supports conversion of PDFs into all conventional image file types, including JPG, BMP, JPEG, GIF, PNG, TIFF, etc.

Read the C# PDF editing tutorial to learn how to make full use of IronPDF to modify PDF documents to best suit project requirements.

How to Edit PDF files in C#

  1. Install the C# library that can edit PDF files
  2. Utilize `FromFile` method to import multiple PDF files
  3. Access and modify PDF file using intuitive APIs in C#
  4. Save the updated version as a new PDF using C#
  5. View the newly edited PDF document

ASPX and .NET: Passwords, Security & Metadata Passwords, Security & Metadata 
using IronPdf;

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

// Get file metadata
System.Collections.Generic.List<string> metadatakeys = pdf.MetaData.Keys(); // returns {"Title", "Creator", ...}

// Remove file metadata
pdf.MetaData.RemoveMetaDataKey("Title");
metadatakeys = pdf.MetaData.Keys(); // return {"Creator", ...} // title was deleted

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

// 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 encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
pdf.SecuritySettings.UserPassword = "sharable"; // password to open the pdf
pdf.SaveAs("secured.pdf");

IronPDF provides developers with strong PDF security options, supporting the customization and setting of PDF metadata, passwords, permissions, and more. With IronPDF's passwords, security, and metadata options, you can create custom permissions and security levels to fit the need of your PDF document. This is done thanks to the use of classes such as the SecuritySettings and MetaData classes. Some options include limiting the PDF documents to be unprintable, setting them to read-only, and 128-bit encryption, and password protection of your PDF documents.

Setting custom metadata works by implementing the MetaData class to access the various PDF metadata options, and setting them with your customized values. This includes changing the author, keywords, modified data, and more. Setting custom security settings includes the ability to set custom user and owner passwords, printing permissions, read-only mode, and more.

5 Steps to setting PDF passwords, metadata, and security

  1. var pdf = PdfDocument.FromFile("encrypted.pdf", "password");
  2. System.Collections.Generic.List<string> metadatakeys = pdf.MetaData.Keys();
  3. var metadatakeys = pdf.MetaData.Keys();
  4. pdf.MetaData.Author = "Satoshi Nakamoto";
  5. pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");

In order to begin customizing the security of your PDF documents, you must first load in an existing PDF or create a new one. Here, we have loaded an existing password-protected PDF document, where we have input the password needed to open the PDF document. Once the PDF is loaded, we then use pdf.MetaData.Keys(); to get the PDF's current metadata. To remove existing PDF metadata values, use the RemoveMetaDataKey method. To begin setting new metadata value, use pdf.MetaData.metadatafield (e.g. pdf.MetaData.Keywords), and then just assign the new value to it. Metadata fields such as Title and Keywords take string values, whereas the ModifiedData field takes datetime values.

Next, we have set new Security settings using the SecuritySettings class. As you can see, there are a variety of settings that you can set here. This gives you full control over the permissions and security levels for each PDF document you work with. To access these settings, you just need to make sure you use pdf.SecuritySettings, followed by the setting you want to adjust. For example, the MakePdfDocumentReadOnly property sets the PDF document to be read-only, encrypting the content at 128-bit. Other options for SecuritySettings include:

  • AllowUserAnnotations: Controls whether or not users can annotate the PDF.
  • AllowUserPrinting: Controls printing permissions for the document.
  • AllowUserFormData: Sets the permissions for whether users can fill-in forms.
  • OwnerPassword: Sets the owner password for the PDF, which is used to disable or enable the other security settings
  • UserPassword: Sets the user password for the PDF, which must be entered in order to open or print the document.

Once you have set the custom metadata, passwords, and security settings for your PDF document, use the pdf.SaveAs method to save your PDF to a specified location.

Click here to view the How-to-Guide, including examples, sample code and files

ASPX and .NET: PDF Watermarking PDF Watermarking 
using IronPdf;

// Stamps a Watermark onto a new or existing PDF
var renderer = new ChromePdfRenderer();

var pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.ApplyWatermark("<h2 style='color:red'>SAMPLE</h2>", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center);
pdf.SaveAs("watermarked.pdf");

IronPDF provides methods to 'watermark' PDF documents with HTML.

Using the ApplyStamp method, developers can add an HTML-based watermark to a PDF file. As shown in the example above, the HTML code for the watermark goes as the first argument to the method. Additional arguments to ApplyStamp control the rotation, opacity, and position of the watermark.

Utilize the ApplyStamp method in lieu of the ApplyWatermark method for more granular control over watermark placement. For example, use ApplyStamp to:

  • Add Text, Image, or HTML watermarks to PDFs
  • Apply the same watermark to every page of the PDF
  • Apply different watermarks to specific PDF pages
  • Adjust the placement of watermarks in front or behind page copy
  • Adjust the opacity, rotation, and alignment of watermarks with more precision

How to Add Watermarks to PDF Files in C#

  1. Download and install the IronPDF library from NuGet.
  2. Create a new PdfDocument or use an existing PdfDocument file.
  3. Call the ApplyWatermark method to add watermarks to the PDF.
  4. Export the PDF file by calling SaveAs.

ASPX and .NET: Backgrounds & Foregrounds Backgrounds & Foregrounds 
using IronPdf;

// With IronPDF, we can easily merge 2 PDF files using one as a background or foreground
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.AddBackgroundPdf(@"MyBackground.pdf");
pdf.AddForegroundOverlayPdfToPage(0, @"MyForeground.pdf", 0);
pdf.SaveAs("complete.pdf");

You may want to use a specific background and foreground as you create and render your PDF documents in IronPDF. In such a case, you can use an existing or rendered PDF as the background or foreground for another PDF document. This is particularly useful for design consistency and templating.

This example shows you how to use a PDF document as the background or foreground of another PDF document.

You can do this in C# by loading or creating a multi-page PDF as an IronPdf.PdfDocument object.

You can add backgrounds using PdfDocument.AddBackgroundPdf. For more details on background insertion methods, refer to the IronPDF.PdfDocument background documentation; it describes several background insertion methods and their overrides. This adds a background to each page of your working PDF. The background is copied from a page in another PDF document.

You can add foregrounds, also known as "Overlays," using PdfDocument.AddForegroundOverlayPdfToPage. For detailed information on foreground insertion methods, consult the IronPDF.PdfDocument overlay documentation.

ASPX and .NET: Form Data Form Data 
using IronPdf;
using System;

// Step 1.  Creating a PDF with editable forms from HTML using form and input tags
// Radio Button and Checkbox can also be implemented with input type 'radio' and 'checkbox'
const string 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=''> <br>
              <br>
              <p>Please specify your gender:</p>
              <input type='radio' id='female' name='gender' value= 'Female'>
                <label for='female'>Female</label> <br>
                <br>
              <input type='radio' id='male' name='gender' value='Male'>
                <label for='male'>Male</label> <br>
                <br>
              <input type='radio' id='non-binary/other' name='gender' value='Non-Binary / Other'>
                <label for='non-binary/other'>Non-Binary / Other</label>
              <br>

              <p>Please select all medical conditions that apply:</p>
              <input type='checkbox' id='condition1' name='Hypertension' value='Hypertension'>
              <label for='condition1'> Hypertension</label><br>
              <input type='checkbox' id='condition2' name='Heart Disease' value='Heart Disease'>
              <label for='condition2'> Heart Disease</label><br>
              <input type='checkbox' id='condition3' name='Stoke' value='Stoke'>
              <label for='condition3'> Stoke</label><br>
              <input type='checkbox' id='condition4' name='Diabetes' value='Diabetes'>
              <label for='condition4'> Diabetes</label><br>
              <input type='checkbox' id='condition5' name='Kidney Disease' value='Kidney Disease'>
              <label for='condition5'> Kidney Disease</label><br>
            </form>
        </body>
    </html>";

// Instantiate Renderer
var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.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.FindFormField("firstname");
FirstNameField.Value = "Minnie";
Console.WriteLine("FirstNameField value: {0}", FirstNameField.Value);

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

FormDocument.SaveAs("FilledForm.pdf");

You can create editable PDF documents with IronPDF as easily as a normal document. The PdfForm class is a collection of user-editable form fields within a PDF document. It can be implemented into your PDF render to make it a form or an editable document.

This example shows you how to create editable PDF forms in IronPDF.

PDFs with editable forms can be created from HTML simply by adding <form>, <input>, and <textarea> tags to the document parts.

The PdfDocument.Form.FindFormField can be used to read and write the value of any form field. The field's name will be the same as the 'name' attribute given to that field in your HTML.

The PdfDocument.Form object can be used in two ways.

  • The first is to populate the default value of form fields, which must be focused in Adobe Reader to display this value.
  • The second is to read data from user-filled PDF forms in any language.

ASPX and .NET: Rasterize a PDF to Images Rasterize a PDF to Images 
using IronPdf;
using IronSoftware.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\example_pdf_image_*.jpg", 100, 80);

// Extract all pages as AnyBitmap objects
AnyBitmap[] pdfBitmaps = pdf.ToBitmap();

Use IronPDF to convert a PDF to images in your preferred file type, image dimensions, and DPI quality.

To convert a PDF document to images, call IronPDF's RasterizeToImageFiles method on a PdfDocument object. A PDF document can be loaded using the PdfDocument.FromFile method or one of the available PDF generation methods for .NET Core.

RasterizeToImageFiles renders each page of the PDF as a rasterized image. The first argument specifies the naming pattern to use for each image. Optional arguments can be used to customize the quality and dimensions for each image. Another option allows the method to convert selected pages from the PDF into images.

Line 24 of the featured code example demonstrates the ToBitMap method. Call this method on any PdfDocument object to quickly convert the PDF into AnyBitmap objects that can be saved to files or manipulated as needed.

How to Convert a PDF to Images in C#

  1. Install the PDF to image C# library
  2. Import existing PDF file with FromFile method
  3. Convert PDF to image using RasterizeToImageFiles method
  4. Specify save directory and image size
  5. Check the output images

ASPX and .NET: Digitally Sign a PDF Digitally Sign a PDF 
using IronPdf;
using IronPdf.Signing;

// 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 ChromePdfRenderer();
var 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
    SigningContact = "support@ironsoftware.com",
    SigningLocation = "Chicago, USA",
    SigningReason = "To show how to sign a PDF"
};

//Step 3. Sign the PDF with the PdfSignature. Multiple signing certificates may be used
doc.Sign(signature);

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

Digitally signing a PDF document helps to ensure the document's integrity by providing a method of adding authentication to the PDF itself. With IronPDF, you have several options when it comes to signing a new or existing PDF file. These are either digitally signing the PDF document with a certificate, adding a graphical handwritten version of your signature to the PDF, stamping an image of the certificate on the PDF, or simply creating a signature form field on the PDF to prompt user signing.

Steps to Digitally Signing a PDF with IronPDF

  • var renderer = new ChromePdfRenderer();
  • var doc = renderer.RenderHtmlAsPdf("<h1>Testing 2048 bit digital security</h1>");
  • var signature = new IronPdf.Signing.PdfSignature("Iron.pfx", "123456") { SigningContact = "support@ironsoftware.com", SigningLocation = "Chicago, USA", SigningReason = "To show how to sign a PDF" };
  • doc.Sign(signature);
  • doc.SaveAs("signed.pdf");

The first step in this process is to either load in or create the PDF we want to sign. For this example, we will be creating a new PDF document from HTML content. To do this, you will first need to create a new ChromePdfRenderer instance. This is IronPDF's powerful rendering engine used to render HTML, CSS, and JavaScript to PDF without losing quality. We then use the RenderHtmlAsPdf method to render our HTML string into a high-quality PDF document ready to be signed. The resulting PDF is stored in the doc variable.

Next, we need to create our signature. For today's example, we will sign our PDF document with a certificate. PdfSignature represents the digital signature object for signing the PDF, and it requires the path to the ".pfx" file we want to use for the signature and the password to access this file. We have then included three optional properties. The SigningContact adds an email or contact information to the signature metadata, SigningLocation represents the location where the document is signed, and SigningReason provides the reason for the document being signed.

Next, we need to sign the PDF document with the PdfSignature object we created. By calling the Sign method, we are able to apply the signature to the PDF document in one easy line. Multiple signing certificates may be applied to the PDF document using this method.

Finally, we will save the signed PDF document using the SaveAs method, which saves the PDF to the specified file location.

Click here to view the How-to Guide, including examples, sample code, and files >

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