---
title: "PDF Watermark API: Add Image & Text Watermarks to PDFs | Nutrient Integrations"
canonical_url: "https://www.nutrient.io/guides/document-converter/document-converter-services/watermark/"
md_url: "https://www.nutrient.io/guides/document-converter/document-converter-services/watermark.md"
last_updated: "2026-05-28T01:45:39.190Z"
description: "Secure your PDFs and Office files by adding customizable image and text watermarks using our REST API. Integrate seamlessly with C#, Java, .NET Core, PHP, or JavaScript."
---

# PDF Watermark API

Keep documents secure by adding watermarks to your PDF or Office files through our REST API, or by deploying our watermarking library in your self-hosted server. 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). Easily integrate with code samples available in C#, Java,.NET Core, PHP, and JavaScript.

- [C#](/guides/document-converter/document-converter-services/watermark/csharp.md)

- [Java](/guides/document-converter/document-converter-services/watermark/java.md)

- [.NET Core](/guides/document-converter/document-converter-services/watermark/dotnet-core.md)

- [PHP](/guides/document-converter/document-converter-services/watermark/php.md)

- [JavaScript](/guides/document-converter/document-converter-services/watermark/javascript.md)

---

## Related pages

- [C# Watermark Server](/guides/document-converter/document-converter-services/watermark/csharp-server.md)
- [Add watermarks to documents with C#](/guides/document-converter/document-converter-services/watermark/csharp.md)
- [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 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)