Telerik HTML to PDF Generator vs IronPDF

Generating PDF documents programmatically can be complex due to its complexity, especially when they include images, tables, text, formatting, and other features.

The main challenge is to figure out how to convert a plain text document into a PDF format. Numerous methods can be used, but choosing one that will maintain the formatting of the original document is essential.

In this tutorial, I'll compare Progress software Corporation's Telerik PdfProcessing library with Iron Software's IronPDF in how well both can generate PDF documents.

Telerik PdfProcessing

Telerik PdfProcessing, part of Progress's portfolio of document processing applications, allows you to create PDFs and export them documents without writing any code. It has features such as text blocks, images, forms, tables, import and export. In addition, the library offers features that are perfect for flow-like editing. The PdfProcessing app is available for web, desktop, and mobile platforms.

IronPDF .NET PDF library

IronPDF is a .NET PDF library that can generate PDFs without requiring Adobe Acrobat or other third-party software. The library can create PDFs from scratch or export existing .NET components (like ASP.NET web pages, WPF user interfaces etc.) into PDF files.

Installation

In this section, I'll cover how we can install IronPDF and Telerik Document Processing libraries.

Installation of Telerik Document Processing Libraries

To create a PDF document from HTML using the Telerik Document Processing suite, we have to install three libraries:

1. Telerik.Documents.Core.Trial
2. Telerik.Documents.Flow.FormatProviders.Doc.Trial
3. Telerik.Documents.Flow.FormatProviders.Pdf.Trial
4. Telerik.Documents.Flow.Trial

You can install the following libraries using the NuGet Package Manager.

Telerik and Kendo UI Libraries

Installation of IronPDF C#.NET PDF Library

You can install IronPDF using three ways:

1. Install with NuGet Package Manager Console
2. Install with NuGet Visual Studio GUI
3. Download the DLL file

For installation with the Package Manager Console, you'll need to write the following command in the console.

Install-Package IronPdf

It'll install the latest IronPDF library version in the project. Of course, you can always check the newest version of IronPDF on the NuGet website.

Generate PDFs using Telerik

Telerik supports converting HTML to PDF using the RadFlowDocument library addon. It can convert HTML document containing HTML string to PDF document.

You can use the following code for converting HTML to PDF using Telerik.

using Telerik.Windows.Documents.Flow.FormatProviders.Html;
using Telerik.Windows.Documents.Flow.Model;

HtmlFormatProvider htmlProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Html.HtmlFormatProvider();
// Create a document instance from the content.
RadFlowDocument document = htmlProvider.Import(File.ReadAllText(@"C:\HTML Website\website\index.html"));

Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider pdfProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider();

// Export the document. The different overloads enable you to export to a byte [] or to a Stream.
byte [] pdfBytes = pdfProvider.Export(document);

File.WriteAllBytes(@"C:/test.pdf", pdfBytes);

using Telerik.Windows.Documents.Flow.FormatProviders.Html;
using Telerik.Windows.Documents.Flow.Model;

HtmlFormatProvider htmlProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Html.HtmlFormatProvider();
// Create a document instance from the content.
RadFlowDocument document = htmlProvider.Import(File.ReadAllText(@"C:\HTML Website\website\index.html"));

Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider pdfProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider();

// Export the document. The different overloads enable you to export to a byte [] or to a Stream.
byte [] pdfBytes = pdfProvider.Export(document);

File.WriteAllBytes(@"C:/test.pdf", pdfBytes);

Imports Telerik.Windows.Documents.Flow.FormatProviders.Html
Imports Telerik.Windows.Documents.Flow.Model

Private htmlProvider As HtmlFormatProvider = New Telerik.Windows.Documents.Flow.FormatProviders.Html.HtmlFormatProvider()
' Create a document instance from the content.
Private document As RadFlowDocument = htmlProvider.Import(File.ReadAllText("C:\HTML Website\website\index.html"))

Private pdfProvider As New Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider()

' Export the document. The different overloads enable you to export to a byte [] or to a Stream.
Private pdfBytes() As Byte = pdfProvider.Export(document)

File.WriteAllBytes("C:/test.pdf", pdfBytes)

The above code is somewhat complex. You'll first need to create a HtmlFormatProvider and a RadFlowDocument. Import HTML file using the Import function of the HtmlFormatPRovider, and use the returned RadFlowDocument object to produce a PdfFormatProvider. At last, use the WriteAllBytes method on the PdfFormatProvider to export the PDF file to a specific location.

The output generated by Telerik is not good. Telerik didn't retain the UI of the HTML document or load any of the images.

Telerik Output

Generate PDF using IronPDF

IronPDF can generate PDF using HTML file, HTML string and URL.

HTML to PDF

Use the following code to create a PDF document using an HTML file.

using IronPdf;

var IronRenderer = new ChromePdfRenderer();

IronRenderer.RenderingOptions.FitToPaperMode = IronPdf.Engines.Chrome.FitToPaperModes.FixedPixelWidth;

var pdfFromHtmlFile = IronRenderer.RenderHtmlFileAsPdf(@"C:\HTML Website\website\index.html");

pdfFromHtmlFile.SaveAs(@"C:/IronPDF Test.pdf");

using IronPdf;

var IronRenderer = new ChromePdfRenderer();

IronRenderer.RenderingOptions.FitToPaperMode = IronPdf.Engines.Chrome.FitToPaperModes.FixedPixelWidth;

var pdfFromHtmlFile = IronRenderer.RenderHtmlFileAsPdf(@"C:\HTML Website\website\index.html");

pdfFromHtmlFile.SaveAs(@"C:/IronPDF Test.pdf");

Imports IronPdf

Private IronRenderer = New ChromePdfRenderer()

IronRenderer.RenderingOptions.FitToPaperMode = IronPdf.Engines.Chrome.FitToPaperModes.FixedPixelWidth

Dim pdfFromHtmlFile = IronRenderer.RenderHtmlFileAsPdf("C:\HTML Website\website\index.html")

pdfFromHtmlFile.SaveAs("C:/IronPDF Test.pdf")

I use the RenderHtmlFileAsPdf method to generate PDF from the HTML file. This function reads all content from the HTML file, loading the related CSS and JavaScript files. The output of the RenderHtmlFileAsPdf method is below.

IronPDF HTML to PDF

IronPDF generates PDF from HTML very beautifully. This result is different and better than the Telerik-generated PDF.

URL to PDF

You can use the following code to generate PDF from the URL.

using IronPdf.Rendering;
using IronPdf;

ChromePdfRenderer renderer = new ChromePdfRenderer();

renderer.RenderingOptions.PaperSize = PdfPaperSize.A2;

PdfDocument myPdf = renderer.RenderUrlAsPdf("https://dotnet.microsoft.com/en-us/");
myPdf.SaveAs(@"C:/dotnet.pdf");

using IronPdf.Rendering;
using IronPdf;

ChromePdfRenderer renderer = new ChromePdfRenderer();

renderer.RenderingOptions.PaperSize = PdfPaperSize.A2;

PdfDocument myPdf = renderer.RenderUrlAsPdf("https://dotnet.microsoft.com/en-us/");
myPdf.SaveAs(@"C:/dotnet.pdf");

Imports IronPdf.Rendering
Imports IronPdf

Private renderer As New ChromePdfRenderer()

renderer.RenderingOptions.PaperSize = PdfPaperSize.A2

Dim myPdf As PdfDocument = renderer.RenderUrlAsPdf("https://dotnet.microsoft.com/en-us/")
myPdf.SaveAs("C:/dotnet.pdf")

The RenderUrlAsPdf function converts a webpage's URL into a PDF. It waits to load all related files before rendering. It produces extraordinary results. It preserves all colors, designs, and UI. You can see the output below.

URL to PDF

You can get more tutorials about IronPDF and see them in action on the IronPDF website.

Comparison

As we've seen the output UI for ASP.NET results of IronPDF and Telerik, we can say that Telerik is not a good option for HTML to PDF conversions, as its rendering quality is not good. You can see the difference between the outputs of IronPDF and Telerik below.

Output Comparison

Rendering Quality

In above image, you can see the clear difference between the standard outputs of IronPDF and Telerik. Let's compare the output on basis of features.

The rendering quality of Telerik is poor. The PDFs that it renders have poor formatting, failing to preserve the original styles of the document. On the other hand, IronPDF has outstanding rendering quality, retaining every aspect of the source document.

CSS and JavaScript Support

Telerik doesn't support external files. Moreover, it doesn't support JavaScript.

Conversely, IronPDF has full support for internal and external CSS and JavaScript declarations. Processing of JavaScript can be toggled on or off as required with IronPDF.

Limitations of Telerik Document Processing

In summation, following are some additional limitations of Telerik PdfProcessing:

1. Telerik doesn't support external files like CSS or JavaScript
2. Images don't render in PDFs
3. Telerik doesn't support URLs to PDF
4. Telerik doesn't support any linking file with the HTML document
5. The rendering quality is bad

Features of IronPDF

IronPDF's chief features are:

• IronPDF supports URL-to-PDF and HTML file-to-PDF conversion.
• IronPDF supports external files like images, CSS and JS files.
• IronPDF automatically loads every file without using any external library.
• IronPDF has extensive documentation.
• IronPDF preserves the UI and gives perfect rendering quality.

There are many other features of IronPDF. You can visit the IronPDF website for the best information.

IronPDF Features

Conclusion

In this article, we compared IronPDF with Telerik PdfDocument Processing libraries and find that IronPDF is far better than the Telerik library for the HTML to PDF conversion.

IronPDF is an excellent library for all PDF-related operations. You can create, edit and modify PDF files in all the latest .NET and .NET Core frameworks. Visit the Licensing Page for more information about the distribution and licensing of IronPDF product bundles.