Merge Pdfs Using iTextSharp, C#. I had to automate the process of merging a couple of pdfs and insert an image on a particular page. Since this involved. We often face a situation where we need to merge some of the PDF Documents in our applications. Itext provides us with a way to merge. NET C# using iTextSharp. Merge multiple GIF, PNG, JPG, TIFF and PDF files into a single PDF file NET C# using the iTextSharp library.

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Following on from my last Farm Solution, I have extended the solution by adding another button that when clicked, it looks up the document library and grabs all pdf files. Looping through each file, copies each pdf to itdxtsharp memory stream, once it have completely looped through each file, it then saves the file back to the SharePoint library.


The advantage of using ITextSharp dll, is that you could create a provider hosted SharePoint App, and therefore create this merge functionality in Office First thing we need to do is add the itextsharp to the Visual Studio project.

With NuGet this is really simple. Right click your project and select Manage NuGet Packages….

Merge PDF File release

This will open the Manage NuGet Packages dialog. Just click the Install button, and accept the License Acceptance. This will add the itextsharp reference to your project. All that remains is to ensure that this dll is deployed to the GAC.

Merge multiple image files into a single PDF file with C#

Double Click on the Package. Package file in your project. Select the Advanced tab. Then click the Add to add Existing assemblies.

iText 5 merging PDF documents

You will find the dll sitting in a package folder at the same location itextdharp find the. I used a helper method to check if folder exists and another method to return the found folder.


I have pinched this method and converted to work on an on-premise code from the OfficeDevPnP code. As you can see from my screen shot, I now have a document called combined. Link to Sample code: SharePoint and other geeky stuff.

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