Adding a watermark to PDF documents

Adding a watermark text to the WooCommerce PDF Invoices & Packing Slips plugin documents is very simple and straightforward. It’s possible to add it using either the free version only or more easily with a custom block from the Premium Templates extension.

Using the free version only #

In the free version a code snippet is required, which can be scaring if you’re not used to them. If you’re not familiarized with the hooks concept, please read this documentation page: How to use filters.

The HTML elements code snippet: #

add_action( 'wpo_wcpdf_before_document', function( $document_type, $order ) {
	?>
	<div class="watermark-wrapper"><span class="watermark">Watermark</span></div>
	<?php
}, 10, 2 );

You could replace the test “Watermark” with your own custom text.

The styles code snippet: #

add_action( 'wpo_wcpdf_custom_styles', function( $document_type, $document ) {
    ?>
	.watermark-wrapper, .watermark {
		position:         fixed;
		z-index:          -999;
		font-family:      "Open Sans";
	}
	.watermark {
		bottom:           4cm;
		left:             4cm;
		font-size:        40pt;
		font-weight:      bold;
		color:            #f0f0f0;
		transform-origin: left top 0;
		transform:        rotate(-60deg) scale(2);
	}
	<?php
}, 10, 2 );

Using a custom block: #

It’s more simple to use a custom block, you just need to navigate to the Customizer and add one from there like below:

Using this HTML code:

<div class="watermark-wrapper"><span class="watermark">Watermark</span></div>

And finally you just need to add the styles in the Customizer custom styles input like in the image below:

.watermark-wrapper, .watermark {
	position:         fixed;
	z-index:          -999;
	font-family:      "Open Sans";
}
.watermark {
	bottom:           4cm;
	left:             4cm;
	font-size:        40pt;
	font-weight:      bold;
	color:            #f0f0f0;
	transform-origin: left top 0;
	transform:        rotate(-60deg) scale(2);
}