Create PDF file on Azure

GemBox.Pdf is a standalone .NET component that's ideal for web applications because of its fast performance and thread safety when working with multiple PdfDocument objects.

GemBox.Pdf can be used on various platforms including Azure Functions and Azure App Services.

Azure Functions

To create an Azure function, search for "Azure Functions" in a new project dialog.

Screenshot of Visual Studio project type selection
Screenshot of Visual Studio project type selection

To avoid any potential issues with GemBox.Pdf, we recommend using the newer versions of Azure Functions (v3 or above). The following is an Azure function project file:

<Project Sdk="Microsoft.NET.Sdk">
    <PackageReference Include="GemBox.Pdf" Version="*" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.20.1" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.1.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.16.4" />
    <None Update="host.json">
    <None Update="local.settings.json">

Note that saving to XPS and image formats (like PNG and JPG) currently works only on Azure Functions that target .NET Framework.

The following example shows how you can create a PDF document using GemBox.Pdf in an Azure Function.

Generated PDF document from Azure Functions
Screenshot of PDF file created with Azure function
using GemBox.Pdf;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Http;
using System.IO;
using System.Net;
using System.Threading.Tasks;

public class GemBoxFunction
    public async Task<HttpResponseData> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get")] HttpRequestData req)
        // If using the Professional version, put your serial key below.

        using (var document = new PdfDocument())
            // Add a first empty page.

            // Add a second empty page.

            var fileName = "Output.pdf";

            using var stream = new MemoryStream();
            var bytes = stream.ToArray();

            var response = req.CreateResponse(HttpStatusCode.OK);
            response.Headers.Add("Content-Type", "application/pdf");
            response.Headers.Add("Content-Disposition", "attachment; filename=" + fileName);
            await response.Body.WriteAsync(bytes, 0, bytes.Length);
            return response;
Imports GemBox.Pdf
Imports Microsoft.Azure.Functions.Worker
Imports Microsoft.Azure.Functions.Worker.Http
Imports System.IO
Imports System.Net
Imports System.Threading.Tasks

Public Class GemBoxFunction
    Public Async Function Run(<HttpTrigger(AuthorizationLevel.Anonymous, "get")> req As HttpRequestData) As Task(Of HttpResponseData)

        ' If using the Professional version, put your serial key below.

        Using document As New PdfDocument()

            ' Add a first empty page.

            ' Add a second empty page.

            Dim fileName = "Output.pdf"

            Using stream As New MemoryStream()
                Dim bytes = stream.ToArray()

                Dim response = req.CreateResponse(HttpStatusCode.OK)
                response.Headers.Add("Content-Type", "application/pdf")
                response.Headers.Add("Content-Disposition", "attachment; filename=" & fileName)
                Await response.Body.WriteAsync(bytes, 0, bytes.Length)
                Return response
            End Using
        End Using

    End Function
End Class

Azure App Services

App Service is a fully managed platform for building, deploying and scaling web apps. GemBox.Pdf can be used from applications that run on an App Service.

To build an ASP.NET Core application, check out our ASP.NET Core example.

To publish an application to Azure App service you need to:

1. Pick Azure as publish target.

Screenshot of Visual Studio target selection
Screenshot of Visual Studio target selection

2. Pick Azure App Service as a specific target.

Screenshot of Visual Studio specific target selection
Screenshot of Visual Studio specific target selection

3. Specify existing App Service or create a new one.

Screenshot of Visual Studio specific App Service selection
Screenshot of Visual Studio specific App Service selection

Limitations on App Services

You can use the full functionality of GemBox.Pdf on Azure Virtual Machine, Azure Cloud Services, and Azure Functions.

But for App Services, there are few rendering limitations:

These features currently have WPF dependencies which means they require a .NET Windows Desktop Runtime. However, we do have plans for providing cross-platform support for them in future releases.

See also

Next steps

GemBox.Pdf is a .NET component that enables developers to read, merge and split PDF files or execute low-level object manipulations from .NET applications in a simple and efficient way.

Download Buy