# Adding SVG Watermarks to Documents > This article shows how to add SVG images to document section headers that repeat automatically on each page. This watermark will be inserted vertically and horizontally centered on each section page. - **Author:** Bjoern Meyer - **Published:** 2022-01-28 - **Modified:** 2026-07-17 - **Description:** This article shows how to add SVG images to document section headers that repeat automatically on each page. This watermark will be inserted vertically and horizontally centered on each section page. - **3 min read** (575 words) - **Tags:** - ASP.NET - ASP.NET Core - MailMerge - Tutorial - **Web URL:** https://www.textcontrol.com/blog/2022/01/28/adding-svg-watermarks-to-documents/ - **LLMs URL:** https://www.textcontrol.com/blog/2022/01/28/adding-svg-watermarks-to-documents/llms.txt - **LLMs-Full URL:** https://www.textcontrol.com/blog/2022/01/28/adding-svg-watermarks-to-documents/llms-full.txt --- In order to add watermarks to documents, images are inserted into a page headers of each section. The content of headers (and footers) are repeated on each page automatically. FrameBase objects including images can be inserted into a header by overlapping the main text. ### Scalable SVG Images Since version 30.0, TX Text Control [supports the insertion of SVG images](https://www.textcontrol.com/blog/2021/07/13/text-control-30-preview-inserting-svg-images/llms-full.txt) which is the preferred image format for watermarks. The advantage of using SVG images is that they, as the name "Scalable Vector Graphics" implies, are scalable. One SVG image can be used for all required sizes in any document. ![Watermark in TX Text Control](https://s1-www.textcontrol.com/assets/dist/blog/2022/01/28/a/assets/background.webp "Watermark in TX Text Control") ### Positioned Behind Text Additionally, objects can be positioned behind the actual text, so that the text is still visible and the watermark can be seen virtually in the background of a document. To achieve this, the following implementation of the Images.Add method must be used: ``` public bool Add(Image image, int pageNumber, System.Drawing.Point location, ImageInsertionMode insertionMode); ``` The required enumeration combination for the *InsertionMode* is *FixedOnPage* and *BelowTheText*: ``` hf.Images.Add(image, 1, new System.Drawing.Point(0, 0), TXTextControl.ImageInsertionMode.FixedOnPage | TXTextControl.ImageInsertionMode.BelowTheText); ``` ### Center the Image Finally, the image must be centered vertically and horizontally on each page of each section in case there are different page sizes and orientations. The following formula is used to calculate the location of the background images: **(\[Page width\] - \[image width\] - \[both page margins\]) / 2** The following diagram shows the various values that must be considered into the calculation of the exact horizontal location: ![Center image](https://s1-www.textcontrol.com/assets/dist/blog/2022/01/28/a/assets/image-calculation.webp "Center image") The following method *AddWatermark* creates headers for each section in order to insert a watermark centered on each page of the document: ``` public void AddWatermark(TXTextControl.ServerTextControl tx, string imagePath) { foreach (TXTextControl.Section section in tx.Sections) { // remove existing headers for demo purposes section.HeadersAndFooters.Remove(TXTextControl.HeaderFooterType.All); // add new header for each section section.HeadersAndFooters.Add(TXTextControl.HeaderFooterType.Header); TXTextControl.HeaderFooter hf = (section.HeadersAndFooters.GetItem(TXTextControl.HeaderFooterType.Header)); // add the watermark TXTextControl.Image image = new TXTextControl.Image(); image.FileName = imagePath; hf.Images.Add( image, 1, new System.Drawing.Point(0, 0), TXTextControl.ImageInsertionMode.FixedOnPage | TXTextControl.ImageInsertionMode.BelowTheText); // calculate the horizontal center location var pageWidth = (int)section.Format.PageSize.Width; var pageMarginsHorizontal = (int)(section.Format.PageMargins.Left + section.Format.PageMargins.Right); var imageWidth = image.Size.Width; int locationX = (pageWidth - imageWidth - pageMarginsHorizontal) / 2; // calculate the vertical center location var pageHeight = (int)section.Format.PageSize.Height; var pageMarginsVertical = (int)(section.Format.PageMargins.Top + section.Format.PageMargins.Bottom); var imageHeight = image.Size.Height; int locationY = (pageHeight - imageHeight - pageMarginsVertical) / 2; // set the location image.Location = new System.Drawing.Point(locationX, locationY); } } ``` This method is called with an instance of a *ServerTextControl* (same code is compatible to Windows Forms and WPF) and a path to the image. In the following code, an *HttpGet* method is implemented to load any document to add a watermark to the document pages: ``` [HttpGet] public IActionResult AddWatermark() { byte[] bDocument; // create a ServerTextControl using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) { tx.Create(); tx.PageUnit = TXTextControl.MeasuringUnit.Twips; // load the template tx.Load("App_Data/nda.tx", TXTextControl.StreamType.InternalUnicodeFormat); AddWatermark(tx, "App_Data/draft.svg"); // save in the internal format tx.Save(out bDocument, TXTextControl.BinaryStreamType.InternalUnicodeFormat); } return Ok(bDocument); } ``` --- ## About Bjoern Meyer As CEO, Bjoern is the visionary behind our strategic direction and business development, bridging the gap between our customers and engineering teams. His deep passion for coding and web technologies drives the creation of innovative products. If you're at a tech conference, be sure to stop by our booth - you'll most likely meet Bjoern in person. With an advanced graduate degree (Dipl. Inf.) in Computer Science, specializing in AI, from the University of Bremen, Bjoern brings significant expertise to his role. In his spare time, Bjoern enjoys running, paragliding, mountain biking, and playing the piano. - [LinkedIn](https://www.linkedin.com/in/bjoernmeyer/) - [X](https://x.com/txbjoern) - [GitHub](https://github.com/bjoerntx) --- ## Related Posts - [How to Mail Merge MS Word DOCX Documents in ASP.NET Core C#](https://www.textcontrol.com/blog/2023/10/16/how-to-mail-merge-ms-word-docx-documents-in-aspnet-core-csharp/llms.txt) - [Using MailMerge in ASP.NET Core 6 Web Applications](https://www.textcontrol.com/blog/2022/01/27/using-mailmerge-in-aspnet-core-6-web-applications/llms.txt) - [Create SignFabric Envelopes from Mail Merge Templates in .NET C#](https://www.textcontrol.com/blog/2026/06/23/create-signfabric-envelopes-from-mail-merge-templates-using-dotnet-csharp/llms.txt) - [Use MailMerge in .NET on Linux to Generate Pixel-Perfect PDFs from DOCX Templates](https://www.textcontrol.com/blog/2025/05/27/use-mailmerge-in-dotnet-on-linux-to-generate-pixel-perfect-pdfs-from-docx-templates/llms.txt) - 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