How to create Barcode of invoice ID and add it to Magento 2 invoice PDF

It is impossible that you have never noticed those bar lines that are printed on the backside of any product or product related docs. Whatever it is but for us, it’s completely unreadable until we own optical character reader machine or software that reads those data which is made up of varying the widths and spacings of parallel lines in a linear structure.

In this digital era, technology is changing rapidly with new aspects of innovation to make human life easier than it was. But for Barcode its opposite, day by day it became digital and inexpensive to generate and print that can store various information. Also, it helps a lot to eliminate the possibility of human error and also it takes less little than a second to read.

Today, we are back with a different kind of blog that helps you to automatically create a barcode of invoice ID and add it to invoice pdf In Magento 2.

First, we need to create custom extension after that for displaying our barcode in invoice PDF we need to link our custom code file.
app\code\Vendor\Extension\etc\di.xml

<?xml version="1.0" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
	<type name="Magento\Sales\Model\Order\Pdf\Invoice">
    	<plugin name="vendor_extension_sales_model_order_pdf_invoice"
                type="Vendor\Extension\Plugin\Invoice" sortOrder="10" />
	</type>
</config>

<?xml version="1.0" ?>

<plugin name="vendor_extension_sales_model_order_pdf_invoice"

type="Vendor\Extension\Plugin\Invoice" sortOrder="10" />

</type>

</config>

Now we need to create invoice.php which contains our logic of generating a barcode. app\code\Vendor\Extension\Plugin\invoice.php

<?php
namespace Vendor\Extension\Plugin;
 
class Invoice
{
   public function beforeInsertDocumentNumber($subject, $page, $text) 
   {
          $docHeader = $subject->getDocHeaderCoordinates();
          $image = $this->_generateBarcode($text);
          $width = $image->getPixelWidth();
          $height = $image->getPixelHeight();
 
          $page->drawImage($image, $docHeader[2] - $width, $docHeader[1] -$height, $docHeader[2], $docHeader[1]);
  }
 
  protected function _generateBarcode($text) 
  {
     $config = new \Zend_Config([
     'barcode' => 'code128',
     'barcodeParams' => [
     'text' => $this->_extractInvoiceNumber($text),
     'drawText' => true
     ],
     'renderer' => 'image',
     'rendererParams' => ['imageType' => 'png']
     ]);
 
     $barcodeResource = \Zend_Barcode::factory($config)->draw();
 
     ob_start();
     imagepng($barcodeResource);
     $barcodeImage = ob_get_clean();
 
     $image = new \Zend_Pdf_Resource_Image_Png('data:image/png;base64,'.base64_encode($barcodeImage));
 
     return $image;
  }
 
   protected function _extractInvoiceNumber($text) 
   {
          $array_of_words = explode("#", $text);
          return $array_of_words[1];
   }
}

<?php

namespace Vendor\Extension\Plugin;

class Invoice

{

public function beforeInsertDocumentNumber($subject, $page, $text)

{

$docHeader = $subject->getDocHeaderCoordinates();

$image = $this->_generateBarcode($text);

$width = $image->getPixelWidth();

$height = $image->getPixelHeight();

$page->drawImage($image, $docHeader[2] - $width, $docHeader[1] -$height, $docHeader[2], $docHeader[1]);

}

protected function _generateBarcode($text)

{

$config = new \Zend_Config([

'barcode' => 'code128',

'barcodeParams' => [

'text' => $this->_extractInvoiceNumber($text),

'drawText' => true

'renderer' => 'image',

'rendererParams' => ['imageType' => 'png']

]);

$barcodeResource = \Zend_Barcode::factory($config)->draw();

ob_start();

imagepng($barcodeResource);

$barcodeImage = ob_get_clean();

$image = new \Zend_Pdf_Resource_Image_Png('data:image/png;base64,'.base64_encode($barcodeImage));

return $image;

}

protected function _extractInvoiceNumber($text)

{

$array_of_words = explode("#", $text);

return $array_of_words[1];

}

If you working with Magento 2.3.3 you need follow with below code,

Step 1: Add this class,

use \Zend\Barcode\Barcode;

1	use \Zend\Barcode\Barcode;

Step 2:Replace this:

$barcodeResource = \Zend_Barcode::factory($config)->draw();

1	$barcodeResource = \Zend_Barcode::factory($config)->draw();

With this:

$barcodeResource = Barcode::factory($config)->draw();

1	$barcodeResource = Barcode::factory($config)->draw();

Tadaa! You did it.
Now you can sit back and relax. This code will automatically generate a barcode for each invoice pdf. You can also modify this according to your need of generating a barcode for various product documents.
Lastly, hit that stars if this code worked for you.
Happy Coding!

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[Total: 18 Average: 4.3]

9 Comments

Amit on October 29, 2021

Hello ,

This code is not working for magento 2.4.1 can you please help.

Thank you

- magecomp on November 2, 2021
  
  Can you please share the issues which you are facing in magento 2.4.1
  
  - Talal Aswad on November 10, 2021
    
    Hi,
    In Magento 2.4.1 display this issue: Error: Class ‘Zend\Barcode\Barcode’ not found
    
    - Anonymous on February 9, 2022
      
      I have to face the same issue.
      Are resolved this issue Talal Aswad?
      
      - magecomp on February 17, 2022
        
        In the New Magento version, they remove the classes, you need to do things in another way.
        So you contact us at support@magecomp.com for more information.
smruti on April 1, 2021

Hello ,
I used this code in magento 2.3.2 and 2.4.1 also . But problem is that no barcode show on that invoice pdf page , Please Help.

- magecomp on November 2, 2021
  
  Can you please share the exact issue if you are facing?
  
Greg on August 23, 2020

Could not get to work for Magento v2.3

- magecomp on September 1, 2020
  
  We have updated the code for Magento 2.3. please refer again.