.NET Core PDF Library

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.

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 ChromePdfRenderer class include settings for margins, headers, footers, paper size, and form creation.

• The code example above demonstrates how to create a PDF document from a web page using the IronPDF library.
• This involves setting up a renderer with specific options like paper size, margins, header, and footer.
• The ChromePdfRenderer class is used to render the URL to a PDF.
• The resulting PDF document is then saved to a file named "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.

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 RenderHtmlFileAsPdf 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.

This example demonstrates how the user can change PDF print options to turn a 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.

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

You can also convert multiple images into a single PDF document by passing a collection of image paths to ImageToPdfConverter.ImageToPdf:

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

System.IO.Directory.EnumerateFiles

ImageToPdfConverter.ImageToPdf

There are two methods through which headers and footers may be added to a PDF document. They can either be added as a classic text format, with the option to merge in dynamic data. Or, they can be added through the much more flexible HTML format, which allows developers to render dynamic headers and footers through their HTML content.

Steps to Add Headers and Footers to PDFs with IronPDF

Today we will be looking at how you can add classic text headers and footers into your PDF documents in just a few simple steps. The first step towards adding customized headers and footers into your PDF documents is to ensure that the IronPdf library is included in your project with the using IronPdf; statement. Then, instantiate the ChromePdfRenderer, which provides the functionality to render your HTML content in pixel-perfect PDF documents.

Next, configure the header settings. The FirstPageNumber property allows you to specify the starting page number, accommodating for a cover page if needed. The TextHeader properties enable you to customize the appearance, such as drawing a divider line, centering text (in this case, the document URL), selecting the font type and size, and creating a margin at the top of the page for the header.

After configuring the header, set up the footer using the TextFooter properties. Similar to the header, you can draw a divider line, choose the font type and size, and include dynamic content like the current date, time, and page numbers with total pages. Finally, a margin is created at the bottom of the page to accommodate the footer.

By following these steps, you can enhance your PDF documents with informative headers and footers that improve their professionalism and readability.

HTML headers and footers provide a flexible method for creating dynamic headers and footers for your PDF documents. By adding headers and footers through this method, developers have complete control over how their headers and footers look, as they are rendered as independent HTML documents capable of containing their own assets and stylesheets.

Steps to Add Custom HTML Headers and Footers in a PDF with IronPDF

To begin with, you first need to create an instance of the ChromePdfRenderer class, which handles the rendering of HTML content into a pixel-perfect PDF document.

Next, define a footer using the HtmlHeaderFooter class, where you specify the MaxHeight, HTML content for the footer (which in our case includes page numbering), and base URL for image resolution. The footer is styled to display centered page information.

To avoid overlap between the footer and the PDF's main content, set a bottom margin using the MarginBottom property. Similarly, create a header that includes an image (such as a logo) by using the HtmlHeaderFooter class. Here we have set up a BaseUrl to the directory containing your image asset, allowing for proper image resolution during rendering.

Finally, use the MarginTop property to set a top margin that prevents overlap between the header and the content. This example demonstrates how easy it is to implement custom HTML headers and footers in your PDF documents with IronPDF.

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 method can be used to read and write the value of any form field. The field's name attribute is given to that field in your HTML.

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

• Populating Default Values: This can be used to set a default value for form fields that will be displayed in PDF viewers like Adobe Reader.
• Reading User Input: After the user fills in the form, the form fields can be accessed and the data read back into your application.

In the example above, we first import the IronPdf library and define the HTML structure of a simple form with input fields for first name and last name, radio buttons for gender, and checkboxes for medical conditions. Using the ChromePdfRenderer with CreatePdfFormsFromHtml enabled, we convert this HTML content into a PDF document.

The rendered PDF is first saved as "BasicForm.pdf". The PdfDocument.Form object is then used to access and manipulate the form fields - here we set values for the first name and last name fields. Finally, the populated document is saved as "FilledForm.pdf", allowing it to be stored or shared with embedded editable fields.

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 13 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.

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.

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 needs 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.

In order to begin customizing the security of your PDF documents, you must first load 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 values, 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 ModifiedDate 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 method 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.

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

Using the ApplyWatermark 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 ApplyWatermark control the opacity, rotation, and alignment of the watermark.

Use the ApplyWatermark method for a quick way to overlay an HTML watermark on a PDF. For example, use ApplyWatermark to:

• Add HTML (text or image) watermarks to PDFs
• Apply the watermark across the pages of the PDF
• Set the opacity of the watermark
• Adjust the rotation and alignment of the watermark

Example C# Code to Apply a Watermark Using IronPDF

Ensure you have installed the IronPDF library in your project. You can find more detailed instructions on the IronPDF NuGet package page.

Explanation of the Code:

• We start by importing the IronPdf library, which provides all necessary classes and methods for PDF manipulation.
• A PDF document is created or loaded using PdfDocument.FromFile, specifying the file path of the existing PDF.
• HTML content is defined for the watermark. In this case, the watermark displays "Confidential" with specific styling.
• The ApplyWatermark method is used to overlay the watermark on the PDF. Its arguments allow for customization:
  • The first argument is the HTML content of the watermark.
  • opacity: Determines the transparency of the watermark.
  • The vertical and horizontal alignment arguments position the watermark on the page.
• Finally, the SaveAs method exports the modified PDF to a new file.

In conclusion, the IronPDF ApplyWatermark method allows for straightforward watermarking of PDF documents using HTML. This approach is flexible, accommodating various customization needs for positioning, styling, and opacity of watermarks.

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.

This code illustrates how to integrate additional design elements on top of a base PDF using IronPDF. Always refer to the official documentation for more advanced techniques and additional options.