How to Merge PDF Files in VB.NET

IronPDF Features

IronPDF is a powerful PDF SDK foundation for PDF processing, making it simple for developers to produce, read, and edit PDF documents quickly. The IronPDF library converts HTML to PDF by using the Chrome engine. Xamarin, Blazor, Unity, HoloLens applications, Windows Forms, HTML, ASPX, Razor HTML, .NET Core, ASP.NET, and WPF are just a few of the many web components that the library supports. Both conventional Windows Applications and ASP.NET Web Applications can make use of Microsoft .NET and .NET Core programming.

IronPDF allows you to build PDFs that are visually appealing and contain a title and footer by utilizing HTML5, JavaScript, CSS, and pictures. Along with a powerful HTML-to-PDF converter that works with PDF files, the API library also has a standalone PDF conversion engine that is not dependent on any external resources.

• The IronPDF library allows users to create PDFs from a variety of inputs, including image files, HTML, HTML5, ASPX, and Razor/MVC View.
• Tools that can be used to work with interactive PDFs include filling out and submitting interactive forms.
• Merge and divide PDFs, extract text and pictures from PDF files, search text in PDF files, rasterize PDFs to images, change font size and convert PDF files.
• The library also offers the usage of user agents, proxies, cookies, HTTP headers, and form variables for authentication behind HTML login forms, as well as links as the foundation for PDF publications.
• Password-protected PDF files can be accessed with IronPDF in exchange for usernames and passwords.
• Using the IronPDF API, existing PDF files may be read and edited.
• The library can extract images from PDF files in addition to adding text, graphics, bookmarks, watermarks, headers, and footers to PDF files.
• Users can split and combine pages in a new or old PDF document. Without having an Acrobat Reader, IronPDF can also create PDF objects from text.
• From CSS files and CSS media files, PDF documents can be produced.

To know more about the Merge PDF files using IronPDF, refer to the merge PDF files example.

Creating a .NET Core 6 Project

The examples in the parts that follow in this newsletter show how simple the IronPDF library is to use.

Creating a new project to merge PDF files is the first step.

Choose "New Project" from the "File" menu when Visual Studio is open.

Select the "Console App" template in the ensuing dialogue box, then click "Next".

Create a new project in Visual Studio

Enter any project name you pick in the Project name box, and the new project's location in the Location field. To continue, click the Next button.

Configure your new project

From the Framework drop-down menu, pick a .NET Framework. In this case, we're utilizing the long-supported version of .NET, 6.0. Next, click on Create.

.NET Framework selection

Next, download the solution's necessary IronPDF library. Use the following code on the package manager to accomplish this:

Install-Package IronPdf

As an alternative, the NuGet Package Manager can be used to look for the IronPdf package.

Search for IronPDF in NuGet Package Manager UI

A "Save As" dialogue box that enables saving the created IronPDF to the chosen location has been added to this application.

Merge PDF files

You can utilize IronPDF to deal effectively with numerous or huge PDF files. When processing the documents, you can use less RAM thanks to the characteristics of lazy loading and incremental update built-in features. It is possible to merge multiple PDF documents into a single PDF file with a few lines of code.

Below is the sample code to merge multiple PDF files.

Imports System
Imports IronPdf

Module Program
    Sub Main(args As String())
        ' Declare PdfDocument objects for the PDF files to be merged
        Dim firstPDF, secondPDF, MergedPDF As PdfDocument

        ' Load existing PDF files into PdfDocument objects
        firstPDF = PdfDocument.FromFile("A.pdf")
        secondPDF = PdfDocument.FromFile("B.pdf")

        ' Merge the loaded PDF documents into a single PdfDocument
        MergedPDF = PdfDocument.Merge(firstPDF, secondPDF)

        ' Save the merged PDF document to the specified file path
        MergedPDF.SaveAs("MergeDoc.pdf")
    End Sub
End Module

The above code snippet shows how to merge PDF documents using IronPDF. First, load two PDF files A.pdf and B.pdf to create a local variable for the PdfDocument object by using the FromFile function. IronPDF provides a separate function called Merge which helps to pass multiple PDF document objects as parameters to merge PDFs. After passing all the objects into the merge function, another function called SaveAs is used to save the combined PDF files into one PDF file.

The content of two PDF files

The above image shows the two input PDF files. The output PDF file will be linked below.