IronPDF How-Tos Chrome PDF Rendering Engine Chrome PDF Rendering Engine Chaknith Bin Updated:July 28, 2025 Create high-grade PDF renders utilizing the PDF-rendering engine of Chrome! Chromium is an open-source web browser project developed and maintained by Google. It serves as the foundation for several popular web browsers, including Google Chrome, Microsoft Edge, Opera, and many others. Chrome PDF Rendering Engine Download the C# library to use the Chrome PDF rendering engine Utilize the intuitive APIs and build structure Generate pixel-perfect PDF documents Use asynchronous operations for performance Discover what is next on the function list High-Quality Improvements, Well Tested High-Quality Rendering The latest “Blink!” HTML rendering. Choose from Chrome Identical rendering or Enhanced Rendering (which we find more accurate and easy to code for than Chrome.) 20% Faster Renders Provides effortless multithreading and Async, using as many CPU cores as you wish. For SAAS and high-load applications this may be 5-20 times faster, outperforming direct browser usage and web-drivers. Full Support Full (and we mean full) support for JavaScript, responsive layout and CSS3. Azure as a first-class citizen. It just works. Continued maintenance and improved full support for .NET 8, 7, 6, 5, Core, and Framework 4.6.2+. Rigorously Tested The release passed with 1156 green unit & integration tests (and no red ones). We believe this EAP to be as stable as our main release, and has our best minds actively improving it every day. Section 508 Accessibility Compliance Produces accessible PDFs using the PDF(UA) tagged PDF standard. Ongoing Improvements We would love to hear your feedback. Contact support@ironsoftware.com with ideas or if you need any help getting things running. Implement in Your Project 1. Install IronPDF First, you must install IronPDF into your project from the NuGet Package Manager named IronPdf. # This is just a placeholder for installation. Use the NuGet CLI or Package Manager in your IDE. nuget install IronPdf # This is just a placeholder for installation. Use the NuGet CLI or Package Manager in your IDE. nuget install IronPdf SHELL 2. Try the new API We haven’t broken the previous IronPDF C# and VB.NET API you are already using. It will remain! However, the old style is being superseded by a better one to give you more control. // Example of setting up RenderingOptions and HttpLoginCredentials in the new API var renderer = new IronPdf.ChromePdfRenderer(); renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.CssMediaType.Screen; // Set HTTP credentials if needed renderer.RenderingOptions.HttpLoginCredentials.Username = "yourUsername"; renderer.RenderingOptions.HttpLoginCredentials.Password = "yourPassword"; // Example of setting up RenderingOptions and HttpLoginCredentials in the new API var renderer = new IronPdf.ChromePdfRenderer(); renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.CssMediaType.Screen; // Set HTTP credentials if needed renderer.RenderingOptions.HttpLoginCredentials.Username = "yourUsername"; renderer.RenderingOptions.HttpLoginCredentials.Password = "yourPassword"; ' Example of setting up RenderingOptions and HttpLoginCredentials in the new API Dim renderer = New IronPdf.ChromePdfRenderer() renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.CssMediaType.Screen ' Set HTTP credentials if needed renderer.RenderingOptions.HttpLoginCredentials.Username = "yourUsername" renderer.RenderingOptions.HttpLoginCredentials.Password = "yourPassword" $vbLabelText $csharpLabel 3. Apply Pixel-Perfect Chrome Rendering This example will give you PDFs that are pixel-perfect to the latest Chrome desktop browser’s “print to PDF” functionality. // Example for rendering a pixel-perfect PDF from HTML var renderer = new IronPdf.ChromePdfRenderer(); var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>"); pdf.SaveAs("HelloWorld.pdf"); // Example for rendering a pixel-perfect PDF from HTML var renderer = new IronPdf.ChromePdfRenderer(); var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>"); pdf.SaveAs("HelloWorld.pdf"); ' Example for rendering a pixel-perfect PDF from HTML Dim renderer = New IronPdf.ChromePdfRenderer() Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>") pdf.SaveAs("HelloWorld.pdf") $vbLabelText $csharpLabel Recommended Improvements We recommend using some Iron-specific improvements. Use screen stylesheets to print PDFs. They are less fiddly to develop and more true to existing web assets. Responsive layout support. Create PDF Forms from your HTML form elements. // Example showing recommended improvements such as responsive layout ... // Example showing recommended improvements such as responsive layout ... ' Example showing recommended improvements such as responsive layout '... $vbLabelText $csharpLabel 4. Multi-threading and Async Support Multithreading and Async support for our Chrome rendering engine is in a different league compared to the previous build. For enterprise-grade multithreading, use our ChromePdfRenderer in your existing threads and it will work. For web applications, this also takes zero setup. For batch processing of HTML to PDF, we recommend using the built-in .NET Parallel.ForEach pattern. We love async and have provided Async variants of all of our rendering methods such as ChromePdfRenderer.RenderHtmlAsPdfAsync. // Example of using async rendering var renderer = new IronPdf.ChromePdfRenderer(); var task = await renderer.RenderHtmlAsPdfAsync("<h1>Async PDF</h1>"); task.SaveAs("AsyncHelloWorld.pdf"); // Example of using async rendering var renderer = new IronPdf.ChromePdfRenderer(); var task = await renderer.RenderHtmlAsPdfAsync("<h1>Async PDF</h1>"); task.SaveAs("AsyncHelloWorld.pdf"); ' Example of using async rendering Dim renderer = New IronPdf.ChromePdfRenderer() Dim task = Await renderer.RenderHtmlAsPdfAsync("<h1>Async PDF</h1>") task.SaveAs("AsyncHelloWorld.pdf") $vbLabelText $csharpLabel 5. What is next? Features Coming Soon Ultra-Slim deployments, useful for Azure functions and AWS Lambda. We aim to provide deployment options to produce the smallest possible disk footprint. Mobile rendering support: support for iOS and Android app developers. IE and Firefox rendering options. Multi-server distributed rendering architectures for large enterprise users. A re-imagined internal PDF document object model to support the widest range of PDF standards. We want to be able to handle reading and automatically fixing corrupted and badly encoded PDF documents elegantly. "{YourIdeaHere}" Feature requests and bug reports our customers go to the top of the stack. Please Contact Us for Further Queries with any suggestions or questions. Frequently Asked Questions How does the Chrome PDF Rendering Engine enhance PDF creation? The Chrome PDF Rendering Engine uses Chromium's open-source technology to create high-grade PDF renders that closely mimic Chrome's native print-to-PDF feature, offering developers pixel-perfect results. What are the key features of the PDF rendering engine? Key features include high-quality rendering with options for Chrome Identical or Enhanced Rendering, improved speed through multithreading and asynchronous operations, and full support for JavaScript and CSS3. How can I integrate the PDF library into my .NET projects? You can integrate IronPDF into your .NET projects by installing it via the NuGet Package Manager with the command: nuget install IronPdf. What advantages does the new API provide? The new API offers enhanced control over rendering options, including setting CSS media types and HTTP login credentials, while maintaining backward compatibility with previous implementations. Can I perform asynchronous PDF rendering? Yes, IronPDF supports asynchronous operations, allowing you to apply async variants of rendering methods, which can enhance performance, especially in web applications. Why is multithreading beneficial for PDF rendering? Multithreading allows IronPDF to utilize multiple CPU cores for faster rendering, making it highly efficient for SAAS and high-load applications. Does the library support modern web technologies? IronPDF fully supports modern web technologies such as JavaScript and CSS3, ensuring compatibility with responsive layouts and contemporary web standards. What future improvements are planned for the PDF library? Planned improvements include ultra-slim deployments for cloud functions, mobile rendering support, and additional rendering options like IE and Firefox, alongside a new PDF document object model. How reliable is the PDF library? The library's reliability is assured by its successful completion of 1156 unit and integration tests, ensuring stability and robust performance. Where can I send feedback or get support for the PDF library? You can send feedback or request support by contacting support@ironsoftware.com, where the team is available to assist with any queries or suggestions. Chaknith Bin Chat with engineering team now Software Engineer Chaknith works on IronXL and IronBarcode. He has deep expertise in C# and .NET, helping improve the software and support customers. His insights from user interactions contribute to better products, documentation, and overall experience. Ready to Get Started? Free NuGet Download Total downloads: 15,080,714 View Licenses