
Creating an HTML to PDF converter in C# .Net Core can be a game-changer for your application. You can use the iTextSharp library to achieve this.
In this section, we'll explore how to use the iTextSharp library to convert HTML to PDF in C# .Net Core. This library provides a simple and efficient way to convert HTML to PDF.
Using iTextSharp, you can easily convert HTML to PDF by creating a new PDF document and adding HTML content to it. This is a straightforward process that requires minimal code.
To get started, you'll need to install the iTextSharp library in your .Net Core project. This can be done using NuGet package manager.
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Installation
Installing an HTML to PDF converter in .NET Core is a straightforward process. You can use NuGet's Package Manager Console to install the necessary packages.
For example, you can install the IronPDF library with a single command, which will automatically resolve all dependencies for Windows, Linux, Docker, and serverless targets. This makes it a convenient option for developers.
To install IronPDF, create a new console project and then install the IronPDF NuGet package. This will add the library to your project, allowing you to start working with PDF generation immediately.
Alternatively, you can install the DynamicPDF HTML Converter, DynamicPDF Core Suite, or DynamicPDF Converter packages via NuGet. The easiest way to do this is through the Visual Studio Package Manager.
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Conversion
Converting a website URL to a PDF document is a straightforward process. You can use the RenderUrlAsPdf method to render the URL into a PDF.
To get started, you'll need to install the IronPDF NuGet package. This will give you access to the necessary tools to convert the URL to a PDF. The package is compatible with .NET 8 LTS and can also be used with .NET 9 preview and the forthcoming .NET 10 release in 2025.
To render a URL into a PDF, you'll need to create a ChromePdfRenderer instance and use the RenderUrlAsPdf method. This will take care of rendering the URL into a PDF, and you can then save the result using the SaveAs method.
Alternatively, you can use the ConverterConvert method to create a PDF document from HTML. This involves calling the method and passing a new Uri and path to the PDF document to output.
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Options for Customizing Rendering
IronPDF offers a range of options for customizing PDF rendering. You can set paper size, orientation, and margins to suit your needs.
To fine-tune your output, you can control every aspect of the document using a single ChromePdfRenderOptions object. This includes paper dimensions, orientation, headers & footers, JavaScript timing, watermarks, encryption, and digital signatures.
Adding watermarks to your PDFs is a breeze with IronPDF. Simply utilize the Watermark property with HtmlStamp objects to get started.
For more advanced options, the HtmlStamper class allows for custom positioning and transparency effects. This gives you greater control over the appearance of your watermarks.
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Performance
IronPDF's Chromium engine can render most pages in under 1 second on modern hardware.
Batching renders is a key strategy for multiplying throughput, allowing you to take advantage of multi-threading capabilities.
Trimming headless-Chrome overhead is also crucial for optimization, as it helps reduce unnecessary startup flags.
Live DevTools traces can expose missing fonts, 404 images, and timing events without requiring a code re-compile.
Re-using a thread-safe ChromePdfRenderer instance is essential for optimizing PDF generation performance in .NET Core.
Enabling multi-threading can also help improve the efficiency of your application.
Trimming unnecessary headless-Chrome startup flags can further enhance performance.
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Deploy Generation Code to Docker on Linux & Windows

Deploying PDF-generation code to Docker on Linux and Windows is a breeze with IronPDF. It ships as a single self-contained NuGet package, making containerization straightforward on both operating systems.
To deploy your code, copy the published binaries into a slim runtime image. On Linux, you'll also need to add the two native libraries required by IronPDF: libnss3 and libatk1.0-0.
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Examples
Converting HTML to PDF is a breeze with IronPDF, and you can do it in various ways. You can start with a simple HTML string, like a header and a paragraph, and save it as a PDF file named simple.pdf.
IronPDF can also read HTML files from the file system, parsing and rendering them exactly like a browser would. This approach is ideal for working with pre-built templates for invoices, reports, or any standard document layout.
To give you a better idea, here are a few examples of what you can do with IronPDF:
- Convert a simple HTML string to a PDF file.
- Read and render an HTML file from the file system.
- Convert a live webpage into a PDF file by passing the URL directly to IronPDF.
These examples show just how versatile IronPDF is, and how easy it is to create PDF files from HTML content in C# .NET Core.
Simple String Example

In the Simple String Example, IronPDF is used to render a small, static HTML snippet into a PDF file. This example starts with a basic case of converting a simple HTML string to a PDF file.
IronPDF is used to render a simple string of HTML that contains a header and a paragraph. This HTML snippet will be saved as a PDF file named simple.pdf.
The resulting PDF file will be saved with the name simple.pdf.
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Example from External File
Converting an HTML file from an external source is a straightforward process with IronPDF. This approach is ideal for working with pre-built templates for invoices, reports, or any standard document layout.
You can use the RenderHtmlFileAsPdf() method to read the HTML file template.html from the file system. This method parses and renders the file exactly as a browser would.
The PDF output is then written to disk as fromFile.pdf, allowing you to save the converted PDF with a specific name. This is a great feature when you need to create a PDF version of an existing HTML file.
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Here are the steps involved in converting an external HTML file:
- IronPDF reads the HTML file template.html from the file system.
- It parses and renders the file exactly as a browser would.
- The PDF output is written to disk as fromFile.pdf.
This method is a quick and practical way to create downloadable versions of existing HTML files.
Advanced Topics
In C# .NET Core, you can use the iTextSharp library to convert HTML to PDF, which supports advanced features like tables, images, and fonts.
The iTextSharp library allows you to set the PDF page size and orientation, making it easy to customize the output.
You can also use the library to add watermarks and headers to your PDF documents, giving you more control over the final product.
To add a watermark, you can use the iTextSharp library's PdfStamper class, which allows you to stamp a PDF with a custom image or text.
The iTextSharp library also supports encryption and digital signatures, adding an extra layer of security to your PDF documents.
For example, you can use the library's PdfWriter class to add a digital signature to a PDF document, making it tamper-evident.
To optimize the performance of your HTML to PDF conversion, you can use the iTextSharp library's PdfPageRender class, which allows you to render PDF pages in the background.
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