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How to Convert HTML to PDF in C# for .NET 10 Using IronPDF

Chipego
Chipego Kalinda
Published:

Converting HTML to PDF in C# is one of the most common needs for .NET developers building enterprise or SaaS applications. Whether you need to generate PDF files from web content, HTML documents, or HTML strings, the ability to convert HTML into a professional PDF format is essential for generating reports, invoices, and other printable assets.

The IronPDF library is a powerful HTML to PDF converter built for .NET Framework applications and modern .NET 10 projects. It allows you to easily convert HTML, CSS styles, and even JavaScript rendering into high-quality, fully styled PDF documents - all in just a few lines of C# code.

Convert Html To Pdf Csharp Net 10 1 related to How to Convert HTML to PDF in C# for .NET 10 Using IronPDF

Why IronPDF for HTML to PDF Conversion?

Unlike older PDF libraries that require manually drawing elements on a PDF canvas, IronPDF renders HTML content using a full Chromium engine. This means your HTML file, CSS, and image files are processed exactly as a browser would, preserving layout, fonts, and HTML elements precisely. It’s ideal for:

  • Generating reports dynamically from web apps

  • Rendering web pages or dashboards as PDF files

  • Converting HTML snippets into PDF documents

  • Automating large-scale PDF generation from templates

  • Manipulating existing PDF documents for stamping or merging

IronPDF acts as a full converter library to create PDF documents, giving .NET developers both simplicity and powerful control over PDF generation.

1. Installing IronPDF in a .NET 10 Project

First, you’ll need to create a new .NET 10 project.

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As of today, .NET 10 is still in its preview phase, but it’s fully compatible with IronPDF.

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We’ll use it here to demonstrate how HTML-to-PDF conversion works seamlessly with the latest .NET features and IronPDF’s Chrome-based rendering engine.

Now, it's time to install IronPDF!

You can install IronPDF directly from NuGet Package Manager for Solutions.

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There are other options to install it as well. In your Solution Explorer, open the terminal or Command Line Interface (CLI) and run:

dotnet add package IronPdf
dotnet add package IronPdf
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'dotnet add package IronPdf
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or using NuGet Package Manager Console:

PM > Install-Package IronPdf

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Now you’re ready to start coding.

2. Basic HTML to PDF Conversion

Let’s start with a C# HTML to PDF example that converts HTML content into a PDF file.

using IronPdf;

class Program
{
    public static void Main()
    {
        var renderer = new ChromePdfRenderer();

        string html = "<html><body><h1>HTML to PDF C# Example</h1><p>This demonstrates PDF conversion in .NET 10.</p></body></html>";

        PdfDocument pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("basic_output.pdf");
    }
}
using IronPdf;

class Program
{
    public static void Main()
    {
        var renderer = new ChromePdfRenderer();

        string html = "<html><body><h1>HTML to PDF C# Example</h1><p>This demonstrates PDF conversion in .NET 10.</p></body></html>";

        PdfDocument pdf = renderer.RenderHtmlAsPdf(html);
        pdf.SaveAs("basic_output.pdf");
    }
}
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Explanation:

  • ChromePdfRenderer is the main HTML to PDF converter class.

  • The RenderHtmlAsPdf method converts an HTML string into a PDF document.

  • The generated PDF can be saved as a PDF file or returned as a stream.

In just a few lines, we’ve built a working HTML to PDF converter using C#.

Convert Html To Pdf Csharp Net 10 6 related to 2. Basic HTML to PDF Conversion

3. Convert HTML Files and URLs to PDF

a. Convert an HTML File

You can convert an HTML file from disk (including linked resources like CSS or images):

var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlFileAsPdf("template.html");
pdf.SaveAs("file_conversion.pdf");
var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlFileAsPdf("template.html");
pdf.SaveAs("file_conversion.pdf");
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This method reads your local HTML file and automatically loads external resources (CSS, JS, images) if available.

Convert Html To Pdf Csharp Net 10 7 related to a. Convert an HTML File

b. Convert a Web Page (URL Conversion)

If your input is a web page or existing URL, simply render it directly:

var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderUrlAsPdf("https://ironpdf.com");
pdf.SaveAs("webpage_conversion.pdf");
var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderUrlAsPdf("https://ironpdf.com");
pdf.SaveAs("webpage_conversion.pdf");
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The above code performs a URL directly conversion, rendering the HTML document from the specified URL with full JavaScript rendering and CSS.

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4. Advanced Example: Convert HTML Content with Styling and JavaScript

Many web pages rely on dynamic HTML elements, CSS styles, and JavaScript rendering (charts, dashboards, etc.). IronPDF fully supports this.

var renderer = new ChromePdfRenderer();

renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.WaitFor.RenderDelay(2000); // wait for dynamic JS
renderer.RenderingOptions.MarginTop = 20;
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;

PdfDocument pdf = renderer.RenderHtmlFileAsPdf("Reports/sales.html");
pdf.SaveAs("styled_output.pdf");
var renderer = new ChromePdfRenderer();

renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.WaitFor.RenderDelay(2000); // wait for dynamic JS
renderer.RenderingOptions.MarginTop = 20;
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;

PdfDocument pdf = renderer.RenderHtmlFileAsPdf("Reports/sales.html");
pdf.SaveAs("styled_output.pdf");
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The above code ensures IronPDF waits for dynamic web content to fully load before rendering, resulting in accurate visual fidelity.

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5. Adding Headers, Footers & Page Numbers

You can add professional headers and footers to your generated PDF documents easily.

renderer.RenderingOptions.FirstPageNumber = 1;
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align:center; font-size:14px; margin-top:20px;'>Sales Report</div>"
};

renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align:center; font-size:14px; margin-bottom:20px;'>Page {page} of {total-pages}</div>"
};
renderer.RenderingOptions.FirstPageNumber = 1;
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align:center; font-size:14px; margin-top:20px;'>Sales Report</div>"
};

renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align:center; font-size:14px; margin-bottom:20px;'>Page {page} of {total-pages}</div>"
};
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IronPDF treats these as temporary HTML files, so you can style them using CSS and include custom data such as dates or company names.

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6. Generating PDFs from Multiple HTML Snippets

If you want to generate PDF files by combining several HTML snippets, you can merge them:

var renderer = new ChromePdfRenderer();

PdfDocument part1 = renderer.RenderHtmlAsPdf("<h1>Section 1</h1>");
PdfDocument part2 = renderer.RenderHtmlAsPdf("<h1>Section 2</h1>");

var merged = PdfDocument.Merge(part1, part2);
merged.SaveAs("Merged.pdf");
var renderer = new ChromePdfRenderer();

PdfDocument part1 = renderer.RenderHtmlAsPdf("<h1>Section 1</h1>");
PdfDocument part2 = renderer.RenderHtmlAsPdf("<h1>Section 2</h1>");

var merged = PdfDocument.Merge(part1, part2);
merged.SaveAs("Merged.pdf");
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This helps when you’re creating multi-section reports from different HTML code fragments.

Convert Html To Pdf Csharp Net 10 11 related to 6. Generating PDFs from Multiple HTML Snippets

7. Converting HTML to PDF in Web APIs

In ASP.NET Web API, you can generate and return a PDF document without saving it to disk, using a MemoryStream:

[HttpGet("download")]
public IActionResult GetPdf()
{
    var renderer = new ChromePdfRenderer();
    string html = "<h1>Web Report</h1><p>Generated dynamically.</p>";

    var pdf = renderer.RenderHtmlAsPdf(html);
    var bytes = pdf.BinaryData;

    return File(bytes, "application/pdf", "report.pdf");
}
[HttpGet("download")]
public IActionResult GetPdf()
{
    var renderer = new ChromePdfRenderer();
    string html = "<h1>Web Report</h1><p>Generated dynamically.</p>";

    var pdf = renderer.RenderHtmlAsPdf(html);
    var bytes = pdf.BinaryData;

    return File(bytes, "application/pdf", "report.pdf");
}
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This pattern is ideal for server-side PDF generation in .NET 10 web applications.

8. Customizing HTML Rendering Options

You can control how HTML elements and linked resources are rendered:

renderer.RenderingOptions.BaseUrl = "https://mywebsite.com/";
renderer.RenderingOptions.CustomHeaders.Add("Authorization", "Bearer token");
renderer.RenderingOptions.WaitFor.NavigationTimeout = 10000;
renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.BaseUrl = "https://mywebsite.com/";
renderer.RenderingOptions.CustomHeaders.Add("Authorization", "Bearer token");
renderer.RenderingOptions.WaitFor.NavigationTimeout = 10000;
renderer.RenderingOptions.EnableJavaScript = true;
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This is useful when rendering web pages with external resources or when performing web scraping followed by PDF conversion.

9. Command Line Tool and Console Examples

You can also build a small command line tool for batch HTML to PDF conversion:

using IronPdf;
using System;

class Program
{
    public static void Main(string[] args)
    {
        string inputFile = args[0];
        string outputPath = args[1];

        var renderer = new ChromePdfRenderer();
        PdfDocument pdf = renderer.RenderHtmlFileAsPdf(inputFile);
        pdf.SaveAs(outputPath);

        Console.WriteLine("PDF generated successfully!");
    }
}
using IronPdf;
using System;

class Program
{
    public static void Main(string[] args)
    {
        string inputFile = args[0];
        string outputPath = args[1];

        var renderer = new ChromePdfRenderer();
        PdfDocument pdf = renderer.RenderHtmlFileAsPdf(inputFile);
        pdf.SaveAs(outputPath);

        Console.WriteLine("PDF generated successfully!");
    }
}
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Run it from the Command Line Interface (CLI):

dotnet run "input.html" "output.pdf"

Convert Html To Pdf Csharp Net 10 12 related to 9. Command Line Tool and Console Examples

You’ve just built a simple command line PDF converter for .NET developers.

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10. Advanced .NET Example with Async Pattern

You can also use async patterns for modern .NET 10 applications:

public static async Task Main()
{
    var renderer = new ChromePdfRenderer();
    string url = "https://example.com/dashboard";

    PdfDocument pdf = await Task.Run(() => renderer.RenderUrlAsPdfAsync(url));
    pdf.SaveAs("async_output.pdf");
}
public static async Task Main()
{
    var renderer = new ChromePdfRenderer();
    string url = "https://example.com/dashboard";

    PdfDocument pdf = await Task.Run(() => renderer.RenderUrlAsPdfAsync(url));
    pdf.SaveAs("async_output.pdf");
}
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This is great for scalable systems or cloud APIs that handle high-volume PDF generation.

11. Best Practices for Large-Scale PDF Generation

  • Reuse the ChromePdfRenderer instance when generating multiple PDFs.

  • Store temporary files in a fast SSD-backed location.

  • Use async tasks for batch PDF generation.

  • Avoid excessive JavaScript rendering when not needed.

  • Validate your HTML input files to prevent errors during conversion.

These optimizations ensure smooth PDF conversion in enterprise-scale .NET solutions.

12. Conclusion

With IronPDF and .NET 10, it’s incredibly easy to convert HTML content into stunning, professional PDF files — whether you’re working with HTML strings, local HTML files, or existing URLs.

From simple snippets to large-scale PDF generation, IronPDF gives you a complete HTML to PDF converter with support for JavaScript, CSS, custom headers, and linked resources.

In just a few lines of code, you can generate PDF documents, automate report generation, or embed a PDF converter library directly into your .NET applications.

Start experimenting with your HTML-to-PDF projects today using the IronPDF free trial. Download Now and experience how effortlessly you can generate high-quality PDF files from your HTML content.

Chipego
Chipego Kalinda
  Chat with engineering team now
Software Engineer
Chipego has a natural skill for listening that helps him to comprehend customer issues, and offer intelligent solutions. He joined the Iron Software team in 2023, after studying a Bachelor of Science in Information Technology. IronPDF and IronOCR are the two products Chipego has been focusing on, but his knowledge of ...Read More

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