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Search & replace PDF text or images in Go

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Sample Go 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 Go PDF Library and PDF Editing & Manipulation Library.

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2021 by PDFTron Systems Inc. All Rights Reserved.
// Consult LICENSE.txt regarding license information.
//---------------------------------------------------------------------------------------

package main
import (
	"fmt"
	. "pdftron"
)

import  "pdftron/Samples/LicenseKey/GO"

var inputPath = "../../TestFiles/"
var outputPath = "../../TestFiles/Output/"    

//-----------------------------------------------------------------------------------------
// The sample code illustrates how to use the ContentReplacer class to make using 
// 'template' pdf documents easier.
//-----------------------------------------------------------------------------------------

func main(){
	PDFNetInitialize(PDFTronLicense.Key)

	// Example 1) Update a business card template with personalized info

	doc := NewPDFDoc(inputPath + "BusinessCardTemplate.pdf")
	doc.InitSecurityHandler()

	// first, replace the image on the first page
	replacer := NewContentReplacer()
	page := doc.GetPage(1)
	img := ImageCreate(doc.GetSDFDoc(), inputPath + "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(outputPath + "BusinessCard.pdf", uint(SDFDocE_linearized))
	doc.Close()

	fmt.Println("Done. Result saved in BusinessCard.pdf")

	// Example 2) Replace text in a region with new text

	doc = NewPDFDoc(inputPath + "newsletter.pdf")
	doc.InitSecurityHandler()

	replacer = NewContentReplacer()
	page = doc.GetPage(1)
	replacer.AddText(page.GetMediaBox(), "hello hello hello hello hello hello hello hello hello hello")
	replacer.Process(page)

	doc.Save(outputPath + "ContentReplaced.pdf", uint(SDFDocE_linearized))
	doc.Close()

	fmt.Println("Done. Result saved in ContentReplaced.pdf")
	
    PDFNetTerminate()
	fmt.Println("Done.")
}