How to Run HTML to PDF with .NET on Azure?

Yes. IronPDF can be used to generate, manipulate, and read PDF documents on Azure. IronPDF has been thoroughly tested on multiple Azure platforms including MVC websites, Azure Functions, and many more.

Azure Functions on Docker

If you are running you Azure Functions within a Docker Container please refer to this tutorial instead.


How to Tutorial

Setting up Your Project

Installing IronPDF to Get Started

First step is to install IronPDF using NuGet:

Select Correct Azure Options

Choosing the correct hosting level Azure Tier

Azure Basic B1 is the minimum hosting level required for our end users' rendering needs. If you are creating a high throughput system, this may need to be upgraded.

Uncheck the "Run from package file" Checkbox

When publishing your Azure Functions application make sure Run from package file is NOT selected.

Configuration for .NET 6

Microsoft recently removed imaging libraries from .NET 6+, breaking many legacy APIs. As such, it is necessary to configure your project to still allow these legacy API calls.

  1. On Linux, set Installation.LinuxAndDockerDependenciesAutoConfig=true; to ensure libgdiplus is installed on the machine
  2. Add the following to the .csproj file for your .NET 6 project: <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
  3. Create a file in your project called runtimeconfig.template.json and populate it with the following:
    {
      "configProperties": {
         "System.Drawing.EnableUnixSupport": true
      }
    }
    {
      "configProperties": {
         "System.Drawing.EnableUnixSupport": true
      }
    }
    If True Then
      "configProperties":
      If True Then
    	 "System.Drawing.EnableUnixSupport": True
      End If
    End If
    VB   C#
  4. Finally, add the following line to the beginning of your program: System.AppContext.SetSwitch("System.Drawing.EnableUnixSupport", true);

Using Docker on Azure

One way to gain control, SVG font access, and the ability to control performance on Azure is to use IronPDF applications and Functions from within Docker Containers.

We have a comprehensive IronPDF Azure Docker tutorial for Linux and Windows instances and it is recommended reading.

Azure Function Code Example

IronPDF is tested on Azure Functions v3.3.1.0+ for both Windows and Linux.

This example automatically outputs log entries to the built-in Azure logger (see ILogger log):

[FunctionName("PrintPdf")]
public static async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
    ILogger log, ExecutionContext context)
{
    log.LogInformation("Entered PrintPdf API function...");
    IronPdf.Installation.LicenseKey = "XXXX"; // you may enter a license key here!
    IronPdf.Logging.Logger.EnableDebugging = false;
    IronPdf.Logging.Logger.LoggingMode = IronPdf.Logging.Logger.LoggingModes.Custom;
    IronPdf.Logging.Logger.CustomLogger = log;
    Installation.LinuxAndDockerDependenciesAutoConfig = false;
    Installation.ChromeGpuMode = Engines.Chrome.ChromeGpuModes.Disabled;
    try
    {
        log.LogInformation("About to render pdf...");
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        using var doc = renderer.RenderUrlAsPdf("https://www.google.com/");
        log.LogInformation("finished rendering pdf...");
        return new FileContentResult(doc.BinaryData, "application/pdf"){FileDownloadName = "google.pdf"};
    }
    catch (Exception e)
    {
        log.LogError(e, "Error while rendering pdf", e);
    }

    return new OkObjectResult("OK");
}
[FunctionName("PrintPdf")]
public static async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
    ILogger log, ExecutionContext context)
{
    log.LogInformation("Entered PrintPdf API function...");
    IronPdf.Installation.LicenseKey = "XXXX"; // you may enter a license key here!
    IronPdf.Logging.Logger.EnableDebugging = false;
    IronPdf.Logging.Logger.LoggingMode = IronPdf.Logging.Logger.LoggingModes.Custom;
    IronPdf.Logging.Logger.CustomLogger = log;
    Installation.LinuxAndDockerDependenciesAutoConfig = false;
    Installation.ChromeGpuMode = Engines.Chrome.ChromeGpuModes.Disabled;
    try
    {
        log.LogInformation("About to render pdf...");
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        using var doc = renderer.RenderUrlAsPdf("https://www.google.com/");
        log.LogInformation("finished rendering pdf...");
        return new FileContentResult(doc.BinaryData, "application/pdf"){FileDownloadName = "google.pdf"};
    }
    catch (Exception e)
    {
        log.LogError(e, "Error while rendering pdf", e);
    }

    return new OkObjectResult("OK");
}
<FunctionName("PrintPdf")>
Public Shared Async Function Run(<HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route := Nothing)> ByVal req As HttpRequest, ByVal log As ILogger, ByVal context As ExecutionContext) As Task(Of IActionResult)
	log.LogInformation("Entered PrintPdf API function...")
	IronPdf.Installation.LicenseKey = "XXXX" ' you may enter a license key here!
	IronPdf.Logging.Logger.EnableDebugging = False
	IronPdf.Logging.Logger.LoggingMode = IronPdf.Logging.Logger.LoggingModes.Custom
	IronPdf.Logging.Logger.CustomLogger = log
	Installation.LinuxAndDockerDependenciesAutoConfig = False
	Installation.ChromeGpuMode = Engines.Chrome.ChromeGpuModes.Disabled
	Try
		log.LogInformation("About to render pdf...")
		Dim renderer As New ChromePdfRenderer()
		Dim doc = renderer.RenderUrlAsPdf("https://www.google.com/")
		log.LogInformation("finished rendering pdf...")
		Return New FileContentResult(doc.BinaryData, "application/pdf") With {.FileDownloadName = "google.pdf"}
	Catch e As Exception
		log.LogError(e, "Error while rendering pdf", e)
	End Try

	Return New OkObjectResult("OK")
End Function
VB   C#

Known Issues

SVG fonts rendering is not available on shared hosting plans

One limitation we have found is that the Azure hosting platform does not support servers loading SVG fonts, such as Google Fonts, in their cheaper shared web-app tiers. This is because these shared hosting platforms are not allowed to access windows GDI+ graphics objects for security reasons.

We recommend using a Windows or Linux Docker Container or perhaps a VPS on Azure to navigate this issue where the best font rendering is required.

Azure free tier hosting is slow

Azure free and shared tiers, and the consumption plan, are not suitable for PDF rendering. We recommend Azure B1 hosting/Premium plan, which is what we use ourselves. The process of HTML to PDF is significant 'work' for any computer - similar to opening and rendering a web page on your own machine. A real browser engine is used, hence we need to provision accordingly and expect similar render times to a desktop machine of similar power.

Creating an Engineering Support Request Ticket

In order to create an Engineering Support Request Ticket refer to this guide: https://ironpdf.com/troubleshooting/engineering-request-pdf/