Converting HTML files or web pages to PDF is a common requirement for documentation, archiving, printing, or content sharing. PDF offers consistent layout and formatting across platforms. In this article, you’ll learn how to convert HTML to PDF in C# using Aspose.PDF Cloud SDK for .NET, a powerful and scalable REST API solution for document automation.

Web to PDF Conversion API

The Aspose.PDF Cloud SDK for .NET makes it easy to convert HTML files or online web pages into high-quality, paginated PDF documents. It supports loading HTML content with linked resources such as CSS, JavaScript, and images.

Key Features of API:

  • Convert HTML files and URLs to PDF format
  • Support for external resources (CSS, JS, images)
  • REST API based and platform-independent
  • Custom page setup, margins, and rendering options

Install .NET REST API:

Use NuGet to install the SDK into your .NET application:

Install-Package Aspose.PDF-Cloud

Sign up at the Aspose Cloud Dashboard to get your Client ID and Client Secret.

Convert HTML to PDF in C#

The following steps show how to convert an HTML file to PDF using C#:

  • Firstly, create an instance of Configuration where we pass client credentials.
  • Secondly, initialize an object of PdfApi while passing Configuration object.
  • Thirdly, create an object of GetHtmlInStorageToPdf where we define resultant PDF properties.
  • Finally, we call the customer method saveToDisk to perform the HTML to PDF conversion.
JPEG to PDF online

Image:- JPG to PDF conversion preview.

Web Page to PDF Using cURL

If you prefer working with REST API directly? Here’s how you can convert an HTML file to PDF using cURL.

  1. Get Access Token:
curl -v "https://api.aspose.cloud/connect/token" \
 -X POST \
 -d "grant_type=client_credentials&client_id=YOUR_CLIENT_ID&client_secret=YOUR_CLIENT_SECRET" \
 -H "Content-Type: application/x-www-form-urlencoded" \
 -H "Accept: application/json"
  1. Create PDF from HTML:
curl -v "https://api.aspose.cloud/v3.0/pdf/{resultantFile}/create/html?srcPath=converted.zip&htmlFileName={sourceHTML}" \
-X PUT \
-H  "accept: application/json" \
-H  "authorization: Bearer {ACCESS_TOKEN}" \
-d {} -v

Replace {ACCESS_TOKEN} and sourceHTML with your actual token and html path in cloud storage.

Try HTML to PDF Online

If you want to test HTML to PDF conversion without code, then try using our free HTML to PDF Online Converter to try it instantly in your browser.

html to pdf

Free HTML to PDF Converter App.

Conclusion

Using Aspose.PDF Cloud SDK for .NET, you can reliably convert HTML and web content to PDF with minimal effort. Whether you’re building web reports, exporting CMS content, or generating printable archives, the SDK allows seamless automation in your .NET applications.

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