How to use API to combine PDF files into one?

Open the site: Merge PDF files . Drag and drop PDF files to join them. Or just use a code example in C#. Install .NET SDK and add the reference (import the library) to your .NET project. Open the source PDF file in C#. Load a document to append from the Cloud storage. Call the AppendDocumentOnline() method, passing the output filename with the required extension. Get the combined result as a single file.

What other file formats can I merge my PDF to?

We support a variety of output file formats, including Microsoft Word, OpenOffice, PDF, Web document formats and many more.

What is the maximum size of a PDF file supported by this .NET library?

There are no file size limits for merging PDF files with our .NET SDK.

C# Merge PDF REST API

Combine PDF using C# REST API

Easily merge PDF files together in C# code. This C# library is designed to combine multiple PDF files into a single file using the REST API, i.e. by passing HTTPS calls over the Internet.

This is a professional Cloud-native PDF merging solution that provides C# programmers with both great development flexibility and powerful features. Joining PDF files together is often used when it is necessary to create a set of documents of the same structure, each of which contains unique data. By merging PDF files, you can automate your digital workflows and offload some routine parts of the process to fast and efficient PDF processing C# software.

Merge multiple PDF into one in C#

You may need to combine PDF files together in many cases. For example, you may want to combine multiple PDF files together before printing or archiving.

PDF merging can be part of a whole integrated document-processing approach for generating documents from disparate data sources. Such tasks involve the use of a full-featured PDF manipulation C# library that will process a set of PDF files and merge them together in the shortest possible time, producing a compact and accurate result.

Merge PDF files in C#

To merge PDF in C#, you need at least two source PDF files. For a quick start, please check out the C# code example below.

C# code example to merge PDF files using REST API

Input files

Upload files you want to combine

Run code

Upload files you want to combine

Output format

Select the target format from the list

using Aspose.Words.Cloud.Sdk;

var config = new Configuration { ClientId = "####-####-####-####-####", 
   ClientSecret = "##################" };
var wordsApi = new WordsApi(config);

using var document = File.OpenRead("Input1.pdf");
// Load a document to append from the Cloud storage.
var mergeDocument = new DocumentEntry()
{
    FileReference = new FileReference("Input2.pdf"),
    ImportFormatMode = "KeepSourceFormatting"
};
var documentEntries = new List() { mergeDocument };
var documentList = new DocumentEntryList() { DocumentEntries = documentEntries };
var appendDocumentOnline = new AppendDocumentOnlineRequest(document, documentList);
await wordsApi.AppendDocumentOnline(appendDocumentOnline);

					Run code
				

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How to merge PDF C# REST API

Install .NET SDK and add the reference (import the library) to your .NET project.
Open the source PDF file in C#.
Load a document to append from the Cloud storage.
Call the AppendDocumentOnline() method, passing the output filename with the required extension.
Get the combined result as a single file.

.NET library to join PDF files into a single file

Install 'Aspose.Words Cloud SDK for .NET' using NuGet package manager. Just run nuget install Aspose.Words-Cloud to automatically install and reference the corresponding assembly in your project. As an alternative, you can manually clone Aspose.Words Cloud SDK for .NET source code from GitHub and use it in your project. Please follow these Instructions to quickly get the necessary security credentials and access our REST API.

System Requirements

.NET Standard 2.0 or newer

Refer to the Repository Documentation to see more details.

You can use other popular formats:

.NET API to combine PDF files programmatically

.NET SDK to combine PDF files and export the result to a wide variety of files formats