---
title: "C# Watermark Server: Secure On-Premises Watermarking | Nutrient"
canonical_url: "https://www.nutrient.io/guides/document-converter/document-converter-services/watermark/csharp-server/"
md_url: "https://www.nutrient.io/guides/document-converter/document-converter-services/watermark/csharp-server.md"
last_updated: "2026-05-23T00:08:18.019Z"
description: "C# Watermark Server: Secure On-Premises Watermarking | guide for Nutrient Document Converter SDK with detailed instructions and code examples."
---

# C# Watermark Server

### Online

[Online](https://www.nutrient.io/guides/document-converter/document-converter-services/watermark/csharp.md)

### On-Premises

[On-Premises](https://www.nutrient.io/guides/document-converter/document-converter-services/watermark/csharp-server.md)

Add text and image watermarks to PDF or Office files on your self-hosted server (SOAP API). Dynamically add dates, times, and page numbers to the header and footer of your documents. Insert lines, rectangles, ellipses, barcodes, RTF files, images, and PDFs into your document. Apply multiple watermarks to the same page or to a range of pages (odd, even, portrait, or landscape). Start your free trial or sign up to download and integrate watermarking capabilities into your application.

## Code Samples: Adding Watermarks Using C#

Explore our code samples to learn how you can add watermarks to documents in your application or workflow.

1. [Apply Rich Watermarks to an MS Office Document Using C#](https://github.com/Muhimbi/PDF-Converter-Services/blob/master/Microsoft%20.NET/MS%20Office%20Watermarking)

2. [Apply Rich Watermarks to a PDF Using C#](https://github.com/Muhimbi/PDF-Converter-Services/blob/master/Microsoft%20.NET/Watermarking)

---

## Related pages

- [Add watermarks to PDFs and Office files](/guides/document-converter/document-converter-services/watermark/dotnet-core.md)
- [.NET Core Watermark Server](/guides/document-converter/document-converter-services/watermark/dotnet-core-server.md)
- [Java Watermark Server](/guides/document-converter/document-converter-services/watermark/java-server.md)
- [Add watermarks to documents with C#](/guides/document-converter/document-converter-services/watermark/csharp.md)
- [PDF Watermark API](/guides/document-converter/document-converter-services/watermark.md)
- [Add watermarks to your documents](/guides/document-converter/document-converter-services/watermark/java.md)
- [Add watermarks to your documents](/guides/document-converter/document-converter-services/watermark/javascript.md)
- [Add watermarks to PDFs using PHP API](/guides/document-converter/document-converter-services/watermark/php.md)