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In this demo you can learn how to load a PDF document from a file and layout various PDF objects on top of the existing content.

The demo will make two changes to the PDF document to edit: will create an orange border for each PDF page of the loaded document and will create a canvas whose content is automatically repeated on each PDF page. The content from a HTML document will be laid out in the repeated canvas.

The HTML document does not have a background which makes visible the existing content from PDF and even more, the PNG image used in HTML is also transparent to create a very special effect.
Server Settings
IP: Port: Password:
Open the PDF Document to Edit Open the HTML to Layout on Each PDF Page
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C# Code
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using HiQPdfClient;

namespace HiQPdf_Demo
    public partial class EditPdf : System.Web.UI.Page
        protected void buttonCreatePdf_Click(object sender, EventArgs e)
            string serverIP = textBoxServerIP.Text;
            uint serverPort = uint.Parse(textBoxServerPort.Text);
            string serverPassword = textBoxServerPassword.Text;

            // the path PDF document to edit
            string pdfDocumentToEdit = Server.MapPath("~") + @"\DemoFiles\Pdf\WikiPdf.pdf";
            // assign a string to this variable if the PDF document to edit is password protected
            string pdfOpenPassword = null;

            // load the PDF document to edit
            PdfDocument document = PdfDocument.FromFile(serverIP, serverPort, serverPassword, pdfDocumentToEdit, pdfOpenPassword);

            // set a demo serial number
            document.SerialNumber = "YCgJMTAE-BiwJAhIB-EhlWTlBA-UEBRQFBA-U1FOUVJO-WVlZWQ==";

            #region Add an orange border to each page of the loaded PDF document

            // add an orange border to each PDF page in the loaded PDF document
            foreach (PdfPage pdfPage in document.Pages)
                float crtPdfPageWidth = pdfPage.Size.Width;
                float crtPdfPageHeight = pdfPage.Size.Height;

                // create a PdfRectangle object
                PdfRectangle pdfRectangle = new PdfRectangle(2, 2, crtPdfPageWidth - 4, crtPdfPageHeight - 4);
                pdfRectangle.LineStyle.LineWidth = 2;
                pdfRectangle.ForeColor = PdfColor.OrangeRed;

                // layout the rectangle in PDF page

            #endregion Add an orange border to each page of the loaded PDF document

            #region Layout HTML in a canvas to be repeated on each page of the loaded PDF document

            PdfPage pdfPage1 = document.Pages[0];
            float pdfPageWidth = pdfPage1.Size.Width;
            float pdfPageHeight = pdfPage1.Size.Height;

            // the width of the HTML logo in pixels
            int htmlLogoWidthPx = 400;
            // the width of the HTML logo in points
            float htmlLogoWidthPt = PdfDpiTransform.FromPixelsToPoints(htmlLogoWidthPx);
            float htmlLogoHeightPt = 100;

            // create a canvas to be repeated in the center of each PDF page
            // the canvas is a PDF container that can contain PDF objects ( HTML, text, images, etc )
            PdfRepeatCanvas repeatedCanvas = document.CreateRepeatedCanvas(new RectangleFloat((pdfPageWidth - htmlLogoWidthPt) / 2, (pdfPageHeight - htmlLogoHeightPt) / 2,
                        htmlLogoWidthPt, htmlLogoHeightPt));

            // the HTML file giving the content to be placed in the repeated canvas
            string htmlFile = "" + @"/DemoFiles/Html/Logo.Html";

            // the HTML object to be laid out in repeated canvas
            PdfHtml htmlLogo = new PdfHtml(0, 0, repeatedCanvas.Width, repeatedCanvas.Height, htmlFile);
            // the browser width when rendering the HTML
            htmlLogo.BrowserWidth = htmlLogoWidthPx;
            // the HTML content will fit the destination hight which is the same with repeated canvas height
            htmlLogo.FitDestHeight = true;

            // layout the HTML object in the repeated canvas

            #endregion Layout HTML in a canvas to be repeated on each page of the loaded PDF document

                // write the PDF document to a memory buffer
                byte[] pdfBuffer = document.WriteToMemory();

                // inform the browser about the binary data format
                HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf");

                // let the browser know how to open the PDF document and the file name
                HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename=EditPdf.pdf; size={0}",

                // write the PDF buffer to HTTP response

                // call End() method of HTTP response to stop ASP.NET page processing

        protected void Page_Load(object sender, EventArgs e)
            if (!IsPostBack)
                string pageUri = HttpContext.Current.Request.Url.AbsoluteUri;
                hyperLinkOpenPdf.NavigateUrl = pageUri.Substring(0, pageUri.LastIndexOf('/')) + @"/DemoFiles/Pdf/WikiPdf.pdf";
                hyperLinkOpenHtml.NavigateUrl = pageUri.Substring(0, pageUri.LastIndexOf('/')) + @"/DemoFiles/Html/Logo.Html";