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How to Convert HTML to PDF in C# .NET

How to Convert HTML to PDF in C# .NET

Converting HTML to PDF in .NET: A Simple Solution

Converting HTML documents to PDF is a common requirement for developers building reporting systems, document management solutions, or web-based applications. With Aspose.HTML for .NET, you can easily convert HTML files into professional-looking PDFs that preserve the original layout, text, images, and styles.

Why Convert HTML to PDF?

  1. Universal Accessibility:
    • PDFs are universally accessible and do not require the recipient to have a web browser or special software.
  2. Layout Consistency:
    • Preserve the exact look and feel of your HTML content when converting to PDF, ensuring no data is lost in translation.
  3. Security and Convenience:
    • PDFs provide secure document sharing that can be encrypted and password-protected, making them ideal for confidential documents.

Step-by-Step Guide to Convert HTML to PDF

Step 1: Install the Required Libraries

Install Aspose.HTML for .NET into your project to enable the conversion functionality.

dotnet add package Aspose.HTML

Step 2: Configure Your Metered License

Before you begin, configure your metered license to enable all features.

using Aspose.Html;
using Aspose.Html.Saving;

Metered license = new Metered();
license.SetMeteredKey("<your public key>", "<your private key>");
Console.WriteLine("Metered license configured successfully.");

Step 3: Load the HTML File

Load the HTML file that you wish to convert to PDF using the HTMLDocument class.

HTMLDocument document = new HTMLDocument("input.html");
Console.WriteLine("HTML document loaded successfully.");

Step 4: Set Up PDF Output Options

Configure the output options for the PDF, such as page size and layout, using PdfSaveOptions.

PdfSaveOptions options = new PdfSaveOptions();
options.PageSize = PageSize.A4;  // Set the desired page size
options.PresentationFormat = PresentationFormat.GanttChart;  // Set presentation format if necessary
Console.WriteLine("PDF output options configured.");

Step 5: Convert HTML to PDF

Call the ConvertHTML method to convert your HTML document to PDF format.

Converter.ConvertHTML(document, options, "output.pdf");
Console.WriteLine("HTML converted to PDF successfully.");

Step 6: Test the Output PDF

After the conversion, check the generated PDF to ensure that all content, including text and images, is rendered as expected.

Common Issues and Fixes

1. Formatting Issues in the Output PDF

  • Solution: Ensure that the HTML file is well-formed and that all CSS styles are applied correctly.

2. Incorrect Page Size

  • Solution: Use the PdfSaveOptions.PageSize property to set the desired page size for the output PDF.

3. Slow Conversion with Large Files

  • Solution: Optimize the HTML content and test with smaller chunks of the document if necessary.

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