SelectPdf for .NET - Pdf Watermarks - C# / ASP.NET MVC Sample

This sample shows how to create a new PDF document using SelectPdf, how to add several pages and watermark all the pages with a transparent image in the background.

Pdf watermarks are done using pdf templates that contain elements that repeat on each page of the pdf document.

Sample Code C#

using System.Web.Mvc;
using SelectPdf.Samples.Models;

namespace SelectPdf.Samples.Controllers
    public class PdfWatermarksController : Controller
        // GET: PdfWatermarks
        public ActionResult Index()
            return View();

        public ActionResult SubmitAction(FormCollection collection)
            // create a new pdf document
            PdfDocument doc = new PdfDocument();

            // create a new pdf font
            PdfFont font = doc.AddFont(PdfStandardFont.Helvetica);
            font.Size = 24;

            // add a new page to the document
            PdfPage page = doc.AddPage();

            // create a new text element and add it to the page
            PdfTextElement text = new PdfTextElement(0, 0, Helper.SomeLongText(), font);

            // get image path
            string imgFile = Server.MapPath("~/files/logo.png");

            // watermark all pages - add a template containing an image 
            // to the bottom right of the page
            // the image should repeat on all pdf pages automatically
            // the template should be rendered behind the rest of the page elements
            PdfTemplate template = doc.AddTemplate(doc.Pages[0].ClientRectangle);
            PdfImageElement img = new PdfImageElement(
                doc.Pages[0].ClientRectangle.Width - 300,
                doc.Pages[0].ClientRectangle.Height - 150, imgFile);
            img.Transparency = 50;
            template.Background = true;

            // save pdf document
            byte[] pdf = doc.Save();

            // close pdf document

            // return resulted pdf document
            FileResult fileResult = new FileContentResult(pdf, "application/pdf");
            fileResult.FileDownloadName = "Document.pdf";
            return fileResult;