C# PNG zu PDF konvertieren (Code-Beispiel-Tutorial)

Topics Covered in the Tutorial

In this tutorial, the following topics will be covered:

1. Introduction to the IronPDF Library
2. Create a C# Project
3. Install the IronPDF Library
   • Method 1: NuGet Package Manager Solution
   • Method 2: NuGet Package Manager Console
   • Method 3: Using the DLL file
4. Add the IronPDF Namespace
5. Convert JPG Images to PDF Documents
6. Summary

Requirements when using IronPDF:

• You should have basic knowledge of C# languages.
• You should have a basic knowledge of Windows Applications.

1. Introduction to the IronPDF Library

The IronPDF .NET PDF Library solution is a dream for developers, particularly software engineers who use C#. Using this excellent Iron Software tool, you can easily create a core PDF library for .NET. IronPDF will ensure any PDF conversion from different formats is an effortless and time-saving process.

It also enables you to construct a PDF file using HTML5, JavaScript, CSS, and images. You can seamlessly edit, stamp, and add headers and footers to a PDF. Furthermore, it makes it very easy to read PDF text, extract images, or convert images to PDF programmatically.

Some of the important features include:

• Create PDF documents from HTML4/5, CSS, JavaScript, and images.
• Generate PDF documents from URLs.
• Load URLs with custom-network login credentials, HTTP headers, proxies, cookies, user-agents, and form variables, allowing login behind HTML login forms.
• Encrypting and decrypting PDFs.
• Merging existing PDF files.
• Creating and editing PDF forms.

Here, this tutorial focuses on the conversion of PNG files to PDF documents. IronPDF supports almost every image format for conversion. Supported image formats are JPG, PNG, GIF, TIFF, SVG, and BMP.

2. Create a C# Project

This tutorial will use the latest version of Visual Studio and C# programming language to build the project. As the example code is derived from C# 10.0, you should have some knowledge concerning top-level statements.

Let's begin by creating a C# project.

• Open Visual Studio.
• Either create a new C# project or open an existing one.
• Give a name to the project.
• Select .NET Core >= 3.1 as 3.1 is supported and works on every device. The latest and most stable version of the .NET Framework is 6.0.

Console program after creating project

3. Install the IronPDF Library

Install-Package IronPdf

4. Add the IronPDF Namespace

Now add the IronPDF namespace to your program. You have to add a given line of code at the top of the file.

using IronPdf;

using IronPdf;

Imports IronPdf

This will allow you to access all of the functions provided by IronPDF. This line of code must be added to every file where you wish to use the IronPDF features.

5. Convert PNG to PDF format

Converting PNG files to PDF documents is very easy with IronPDF. Only one line of code can achieve this task using the IronPDF's ImageToPdf method. Inside the directory of the project, place the PNG images to be converted inside a folder named assets. The folder must be placed in the location: bin\Debug\net6.0. Then, using System.IO.Directory, enumerate the assets folder with all the PNG files and pass it to the ImageToPdf method for the conversion operation stream. The following code example helps you convert a PNG image to a PDF document and save a Stream object to the disk.

using IronPdf;
using System;
using System.IO;
using System.Linq;

public class Program
{
    public static void Main()
    {
        Console.WriteLine("C# Convert PNG to PDF using IronPDF");

        // Directory is set to the assets folder. Filters for files ending with '.png' or '.PNG'.
        var images = Directory.EnumerateFiles("assets").Where(f => f.ToLower().EndsWith(".png"));

        // Converts the images to a PDF and saves them.
        if (images.Any())
        {
            ImageToPdfConverter.ImageToPdf(images).SaveAs("composite.pdf");
            Console.WriteLine("PNG successfully converted to PDF");
        }
        else
        {
            Console.WriteLine("No PNG files found.");
        }
    }
}

using IronPdf;
using System;
using System.IO;
using System.Linq;

public class Program
{
    public static void Main()
    {
        Console.WriteLine("C# Convert PNG to PDF using IronPDF");

        // Directory is set to the assets folder. Filters for files ending with '.png' or '.PNG'.
        var images = Directory.EnumerateFiles("assets").Where(f => f.ToLower().EndsWith(".png"));

        // Converts the images to a PDF and saves them.
        if (images.Any())
        {
            ImageToPdfConverter.ImageToPdf(images).SaveAs("composite.pdf");
            Console.WriteLine("PNG successfully converted to PDF");
        }
        else
        {
            Console.WriteLine("No PNG files found.");
        }
    }
}

Imports IronPdf
Imports System
Imports System.IO
Imports System.Linq

Public Class Program
	Public Shared Sub Main()
		Console.WriteLine("C# Convert PNG to PDF using IronPDF")

		' Directory is set to the assets folder. Filters for files ending with '.png' or '.PNG'.
		Dim images = Directory.EnumerateFiles("assets").Where(Function(f) f.ToLower().EndsWith(".png"))

		' Converts the images to a PDF and saves them.
		If images.Any() Then
			ImageToPdfConverter.ImageToPdf(images).SaveAs("composite.pdf")
			Console.WriteLine("PNG successfully converted to PDF")
		Else
			Console.WriteLine("No PNG files found.")
		End If
	End Sub
End Class

In the above code snippet, the asset folder contains only one PNG file. The output file looks like this:

Single JPG file to PDF file

The same code example can be used to convert multiple PNG images. The output file formats contain three PNG-to-PDF documents.

Multiple PNG images to PDF document

6. Summary

This tutorial shows how to convert a PNG image to a PDF document using the IronPDF C# library. The manipulation and configuration of PDF files become remarkably effortless with the IronPDF library function. All that is needed is just a few lines of code to construct a PDF document from PNG files. Whether it's to convert JPG images, PNG images, or numerous other formats, IronPDF is ideal for developers and companies.

Utilize the free version to test it out! Additionally, with a free trial key, you can test the functionality of IronPDF. Furthermore, the current special offer allows you to get five products from IronPDF for the price of just two! Visit this IronPDF licensing information page for more information about licensing.