---
title: "Merge PDF in C# with easy to integrate REST API | Nutrient Document Converter"
canonical_url: "https://www.nutrient.io/guides/document-converter/document-converter-services/merge-or-combine/csharp/"
md_url: "https://www.nutrient.io/guides/document-converter/document-converter-services/merge-or-combine/csharp.md"
last_updated: "2026-06-19T09:21:00.209Z"
description: "Easily merge multiple PDF files and over 30 other file types into one document using C# and Nutrient Document Converter REST API. Combine HTML, CAD, MS Office, and images into PDFs while adding watermarks, passwords, or bookmarks."
---

# Merge PDFs using C#

Combine multiple PDF files seamlessly using C# and our REST API. Merge over 30 file types, including HTML, CAD, MS Office, and image formats, into a single PDF document. Enhance your workflow with features like adding watermarks, passwords, or bookmarks during the merging process. Get started instantly — no server setup needed. Sign up for a free trial to integrate PDF merging into your application or workflow.

## Code sample: Merge PDFs using C#

Explore our [code samples](https://www.nutrient.io/guides/document-converter/document-converter-services/merge-or-combine/code-sample-merge-files.md) to learn how you can quickly merge PDF documents or combine different file formats into a single PDF using the C# and REST API.
---

## Related pages

- [Merge PDFs Using .NET Core](/guides/document-converter/document-converter-services/merge-or-combine/dotnet-core.md)
- [Merge PDFs Using JavaScript](/guides/document-converter/document-converter-services/merge-or-combine/javascript.md)
- [Merge PDF Using PHP](/guides/document-converter/document-converter-services/merge-or-combine/php.md)
- [Merge files with API](/guides/document-converter/document-converter-services/merge-or-combine/code-sample-merge-files.md)
- [Merge PDF API](/guides/document-converter/document-converter-services/merge-or-combine.md)
- [Java Merge PDF API](/guides/document-converter/document-converter-services/merge-or-combine/java.md)