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Header Watermark provides you with extra flexibility and control over the header image(s) for your WordPress site:
<ul>
<li>Use any image from your Media Library as a watermark for your header image(s)</li>
<li>Control the placement and opacity of the watermark</li>
<li>Select any suitable image from your Media Library as your header image(s)</li>
<li>Control which images are used for random header images</li>
</ul>
<h3>Requirements</h3>
Header Watermark requires the following to work:
<ul>
<li>GD Library PHP extension – version 2.0.28 or higher</li>
<li>The WordPress theme must use the get_header_image() function to generate the header image and must also define the HEADER_IMAGE_WIDTH and HEADER_IMAGE_HEIGHT constants</li>
</ul>
<h3>Themes</h3>
This plugin works with the Twenty Ten theme with no further configuration.
If you use this plugin with the Twenty Eleven theme, you may see a notice at the top of your website/WordPress admin pages like this:
<blockquote>
Notice: Constant HEADER_IMAGE already defined in /var/www/yoursite/wordpress/wp-content/themes/twentyeleven/functions.php on line 118
</blockquote>
You may also find that you get occasional errors on some WordPress admin pages, for example if you activate a different theme.
To prevent the notice and errors, find and change the following line in the functions.php file of the Twenty Eleven theme:
Change this: 
 define( ‘HEADER_IMAGE’, ” ); 
to this: 
 if ( ! defined( ‘HEADER_IMAGE’ ) ) { 
 define( ‘HEADER_IMAGE’, ” ); 
 }
Any other themes that define the HEADER_IMAGE constant may have the same problems and need to be altered in the same way for the plugin to work.

Header Watermark

Add a watermark image to your WordPress header image and use suitable images from your media library as the header image(s).

Little Package

PDF Ink Lite can add a watermark to every page of your sold PDF file(s). It can also password and permissions protect your PDF file(s). The watermark is customizable with font face, font color, font size, vertical placement, and text.
PDF Ink Lite watermarks PDF products when downloaded using WooCommerce download links, and works similarly for Download Monitor and Easy Digital Downloads.
Since the watermark is added when the download button is clicked (either on the customer’s order confirmation page or email, or account page), the watermark can include customer-specific data such as the customer’s first name, last name, and email.
Upon purchase download link, this plugin uses the open source TCPDI and TCPDF libraries to parse and customize your PDF. This process isn’t fool-proof, but works well in many cases. You may encounter problems if your PDF is malformed (bad PDF syntax), encrypted, web-optimized, linearized, or if your server cannot handle the memory load of PDF processing/encryption.
(FYI – This plugin used to be called WaterWoo. Little Package chose to rename it after maintaining it for over ten years.)
<h4>Features:</h4>
<ul>
<li>Choice of font face, color, size and placement (a horizontal line of text, centered anywhere on the page)</li>
<li>Included font types cover most languages, and the plugin is internationalized</li>
<li>Dynamic customer data inputs (customer first name, last name, email, order paid date, and phone) to customize PDFs on-the-fly</li>
<li>Add a password to your PDF, and/or anti-copy, anti-print protections</li>
<li>Watermark only designated PDF downloads (as specified by you), or all PDF downloads from your site</li>
<li>Watermark is applied to all pages of the PDF (<a href="https://pdfink.com/" title="Upgrade to the full version" rel="nofollow ugc">upgrade to choose pages</a>)</li>
<li>Accommodates different page/paper sizes, and PDFs with various page sizes (letter, A4, legal, etc)</li>
<li>Secure & encapsulated: PDF Ink hooks into e-commerce download link clicks and checks for PDFs and maybe marks them – that’s it!</li>
</ul>
PDF Ink Lite is the only watermarker for WordPress which includes necessary libraries (so you don’t have to ask your host to load them), is compatible with PHP 8+, and watermarks newer versions of PDFs (not just older versions).
For better PDF coverage and many more options, <a href="https://pdfink.com/" title="PDF Ink" rel="nofollow ugc">check out PDF Ink, the full version of PDF Ink Lite</a>.
<h4>Upgraded (paid) version features:</h4>
<ul>
<li>Clean, robust settings panels and a separate watermarking testing suite</li>
<li>Watermark all PDF files with same settings OR set individual watermarks/passwords per product or even per product variation</li>
<li>Begin watermark on selected page of PDF document (to avoid watermarking a cover page, for example), and/or select end page</li>
<li>Watermark every page, odd pages, even pages, or selected pages</li>
<li>Unlimited rotatable watermark locations on one page, anywhere on the page</li>
<li>Additional dynamic customer data input (business name, address, order number, product name, quantity of product purchased), and filter hooks for adding your own</li>
<li>Semi-opaque (transparent) watermarks – hide your watermarks completely if desired</li>
<li>RTL (right to left) watermarking</li>
<li>Use of some HTML tags to style your output, including text-align CSS styling (right, center, left is default), links (<a>), bold (), italic ()…</li>
<li>Additional text formatting options, such as font color and style (bold, italics) using HTML</li>
<li>Line-wrapping, forced breaks with and tags</li>
<li>Upload and use your own font for stamping. Also, hooks to further customize font use</li>
<li>Higher level PDF protections with AES encryption and extended file protection settings</li>
<li>Keep original file metadata</li>
<li>Open ZIP files and mark PDF files inside the archive</li>
<li>Stamp EPUB files with customized text</li>
<li>Shortcode for creating PDF download links for any page (no need for e-commerce plugin)</li>
<li>Embed marked/encrypted files on the page, using ADOBE SDK embed or PDF Object JavaScript embed.</li>
<li>Test watermark and/or manually watermark a file on the fly, from the admin panel</li>
<li>Preserves external embedded PDF links despite watermarking; internal links are not preserved (<a href="https://pdfink.com/?source=wordpress" rel="nofollow ugc">add SetaPDF-Stamper to PDF Ink</a> for this feature)</li>
<li>Filter hooks to add 1D and 2D barcodes (including QR codes)</li>
<li>Remove stamped files from your server after stamping, or on a schedule</li>
</ul>
<a href="https://pdfink.com/" title="PDF Ink" rel="nofollow ugc">PDF Ink is priced below competitor plugins that offer maybe half the function.</a> Why? Because we want you to succeed! 🥰

PDF Ink Lite – Stamp PDFs with Customer Data

PDF Ink Lite applies custom watermarks & passwords to simple PDFs upon WooCommerce, Download Monitor & Easy Digital Downloads file downloads.

Header Watermark vs PDF Ink Lite – Stamp PDFs with Customer Data