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Search & Replace PDF Text or Images in C# (.NET Core)

Sample C# (.NET Core) code to use PDFTron SDK for searching and replacing text strings and images inside existing PDF files (e.g. business cards and other PDF templates). Unlike PDF forms, the ContentReplacer works on actual PDF content and is not limited to static rectangular annotation regions. Learn more about our PDF Editing & Manipulation Library.

Step 1: Get your free trial license key, or sign in

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Step 2: Add the code:

// Generated code. Do not modify!
//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2018 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

using System;
using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;

namespace ContentReplacerTestCS
{
	/// <summary>
	//-----------------------------------------------------------------------------------------
	// The sample code illustrates how to use the ContentReplacer class to make using 
	// 'template' pdf documents easier.
	//-----------------------------------------------------------------------------------------
	/// </summary>
	class Class1
	{
		private static pdftron.PDFNetLoader pdfNetLoader = pdftron.PDFNetLoader.Instance();

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
        [STAThread]
		static void Main(string[] args)
		{
			PDFNet.Initialize();

			// Relative path to the folder containing test files.
			string input_path = "../../TestFiles/";
			string output_path = "../../TestFiles/Output/";


			// The following example illustrates how to replace an image in a certain region,
			// and how to change template text.
			try
			{
				Console.WriteLine("Opening the input file...");
				using (PDFDoc doc = new PDFDoc(input_path + "BusinessCardTemplate.pdf"))
				using (ContentReplacer replacer = new ContentReplacer())
				{
					doc.InitSecurityHandler();

					// first, replace the image on the first page
					Page page = doc.GetPage(1);
					Image img = Image.Create(doc, input_path + "peppers.jpg");
					replacer.AddImage(page.GetMediaBox(), img.GetSDFObj());
					// next, replace the text place holders on the second page
					replacer.AddString("NAME", "John Smith");
					replacer.AddString("QUALIFICATIONS", "Philosophy Doctor"); 
					replacer.AddString("JOB_TITLE", "Software Developer"); 
					replacer.AddString("ADDRESS_LINE1", "#100 123 Software Rd"); 
					replacer.AddString("ADDRESS_LINE2", "Vancouver, BC"); 
					replacer.AddString("PHONE_OFFICE", "604-730-8989"); 
					replacer.AddString("PHONE_MOBILE", "604-765-4321"); 
					replacer.AddString("EMAIL", "info@pdftron.com"); 
					replacer.AddString("WEBSITE_URL", "http://www.pdftron.com"); 
					// finally, apply
					replacer.Process(page);

					doc.Save(output_path + "BusinessCard.pdf", 0);
					Console.WriteLine("Done. Result saved in BusinessCard.pdf");
				}
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}


			// The following example illustrates how to replace text in a given region
			try
			{
				using (PDFDoc doc = new PDFDoc(input_path + "newsletter.pdf"))
				using (ContentReplacer replacer = new ContentReplacer())
				{
					doc.InitSecurityHandler();

					Page page = doc.GetPage(1);
					Rect target_region = page.GetMediaBox();
					string replacement_text = "hello hello hello hello hello hello hello hello hello hello";
					replacer.AddText(target_region, replacement_text);
					replacer.Process(page);

					doc.Save(output_path + "ContentReplaced.pdf", 0);
					Console.WriteLine("Done. Result saved in ContentReplaced.pdf");
				}
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}

			Console.WriteLine("Done.");
		}
	}
}