How to Convert HTML to PDF in Alpine Docker Container

The Syncfusion® HTML to PDF Converter is a . NET library that allows you to convert HTML or web pages into PDF documents. It also supports conversion within an Alpine Docker container.
In this article, you can refer to the following steps for converting HTML to PDF using the Alpine Docker container.

Steps to convert HTML to PDF in Linux Docker container

1. Create a new ASP.NET Core application and enable the Docker support with Linux as a target OS.
   
   
2. Install the Syncfusion.HtmlToPdfConverter.Net.Linux NuGet package as a reference to your .NET Core application NuGet.org.
   
3. Include the following commands in the Docker file to install the dependent packages in the docker container.

   RUN apk update && \ 
   apk upgrade && \ 
   apk add --update ca-certificates && \ 
   apk add chromium --update-cache --repository http://nl.alpinelinux.org/alpine/edge/community \ 
   rm -rf /var/cache/apk/*

<div class="btn">
  @{ Html.BeginForm("ExportToPDF", "Home", FormMethod.Post);
        {
           <input type="submit" value="Export To PDF" class=" btn" />
        }
     }
</div> 

using Syncfusion.HtmlConverter;
using Syncfusion.Pdf;

6. Add a new action method in HomeController.cs and include the below code sample to convert HTML to PDF document using Convert method in HtmlToPdfConverter class. The HTML content will be scaled based on the given ViewPortSize property of BlinkConverterSettings class.

public ActionResult ExportToPDF()
{
   //Initialize HTML to PDF converter. 
   HtmlToPdfConverter htmlConverter = new HtmlToPdfConverter();
   BlinkConverterSettings settings = new BlinkConverterSettings();
   settings.BlinkPath = "/usr/lib/chromium";
   //Set command line arguments to run without the sandbox.
   settings.CommandLineArguments.Add("--no-sandbox");
   settings.CommandLineArguments.Add("--disable-setuid-sandbox");
   //Set Blink viewport size.
   settings.ViewPortSize = new Syncfusion.Drawing.Size(1280, 0);
   //Assign Blink settings to the HTML converter.
   htmlConverter.ConverterSettings = settings;
   //Convert URL to PDF document.
   PdfDocument document = htmlConverter.Convert("https://www.syncfusion.com");
   //Create memory stream.
   MemoryStream stream = new MemoryStream();
   //Save the document to memory stream. 
   document.Save(stream);
   return File(stream.ToArray(), System.Net.Mime.MediaTypeNames.Application.Pdf, "HTML-to-PDF.pdf");
}

7. Build and run the sample in the Docker. It will pull the Linux Docker image from the Docker hub and run the project. Now, the webpage will open in the browser. Click the Export to PDF button to convert the webpage to a PDF document.

You can download a complete working sample from the Convet_HTMLtoPDF_Alpine_Docker.zip.

By executing the program, you will get the PDF document as follows.

Take a moment to peruse the documentation for Converting HTML to PDF, where you will find various options for URL to PDF, HTML string to PDF, and Hyperlinks.