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Magento 2 – add new Column to the sales Invoice PDF

We recently had to update Magento’s sales invoices to include an additional product attribute (Pack Size) into the PDF. Without purchasing a large extension this update can be made pretty quickly with some custom code.

As ever with a system of Magento’s complexity this does take a little setup and it’s not just editing a few files.

Step 1 – create new module

As we’re going to be doing a few updates I created an AdminOverrides module.


First we need to register the module,

Create the basic module at


To override the PDF classes function in an upgrade safe way we must use the Dependancy Injection system,


Here’s the final file structure of the module.

Magento 2 module file structure

Then in your local files override just the functions that you need. In my case it was

  • The _drawHeader(\Zend_Pdf_Page $page) function of Magento\Sales\Model\Order\Pdf\Invoice
  • The draw() function of Magento\Sales\Model\Order\Pdf\Items\Invoice\DefaultInvoice

Just define your call to override the original class and override just the functions you need.

namespace Develo\AdminOverrides\Model\Sales\Order\Pdf;
* Sales Order Invoice PDF model
* @SuppressWarnings(PHPMD.CouplingBetweenObjects)
class Invoice extends \Magento\Sales\Model\Order\Pdf\Invoice
     * Draw header for item table
     * @param \Zend_Pdf_Page $page
     * @return void
    protected function _drawHeader(\Zend_Pdf_Page $page)

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