ChrisHurst

MyWebsiteAdvisor

This plugin allows you to Automatically displays a watermark on images which have been hotlinked as they are viewed on the Hotlinkers Website. 
The plugin uses PNG watermark images with transparency for precise control over the appearance of the watermarks. 
This plugin also supports simple text watermarks with adjustable color, size and transparency. 
The user friendly settings page allows for control over the appearance of your watermark. 
The watermark preview feature allows for easy testing of the plugin settings. 
The watermark size is controlled as a percentage of the target image, 50% means the watermark will be half the width of the target image. 
Watermarks are non-permenant, original images are not edited, the plugin maintains a cached copy of the watermarked image, which can be cleared and regenerated at any time!
<a href="http://MyWebsiteAdvisor.com/tools/wordpress-plugins/watermark-hotlink-protection/" rel="nofollow ugc">Upgrade to Watermark Hotlink Protection Ultra</a> for advanced 
watermark features including:
<ul>
<li>Fully Adjustable Image Watermark Position</li>
<li>Fully Adjustable Text Watermark Position</li>
<li>Adjustable JPEG Image Output Quality</li>
<li>Highest Quality Watermarks using Image Re-sampling rather than Re-sizing</li>
<li>Lifetime Priority Support and Update License</li>
</ul>
Developer Website: http://MyWebsiteAdvisor.com/
Plugin Support: http://MyWebsiteAdvisor.com/support/
Plugin Page: http://MyWebsiteAdvisor.com/tools/wordpress-plugins/watermark-hotlink-protection/
Requirements:
<ul>
<li>PHP v5.0+</li>
<li>WordPress v3.3+</li>
<li>GD extension for PHP</li>
<li>FreeType extension for PHP</li>
</ul>
To-do:

Watermark Hotlink Protection

Displays a watermark on images which have been hotlinked

BeRocket

Dmytro Holovnia

Product Watermark for WooCommerce plugin allows you to add watermark to images that applied to products. These watermarks can be an image copyright symbol, company logo or text. You will need few clicks to apply a logo or a watermark on all your product images.
<h4>Features:</h4>
✅ Watermark for product images 
✅ Custom watermark position 
✅ Watermarks with transparency is supported 
✅ Custom CSS for front end pages
<h4>Additional Features in Paid Plugin:</h4>
✅ Custom watermark size 
✅ Different watermarks for different image type 
✅ Save aspect ratio for watermarks 
✅ From 1 to 5 watermarks 
✅ Place text to images 
✅ Options to set text color, size and transparency
<h4>Plugin Links:</h4>
<a href="https://berocket.com/woocommerce-products-image-watermark/?utm_source=wordpress_org&utm_medium=plugin_links&utm_campaign=image_watermark" rel="nofollow ugc">Paid Plugin</a> 
<a href="https://woocommerce-currency-exchange.berocket.com/shop/?utm_source=wordpress_org&utm_medium=plugin_links&utm_campaign=image_watermark" rel="nofollow ugc">Demo</a> 
<a href="https://docs.berocket.com/plugin/woocommerce-products-image-watermark?utm_source=wordpress_org&utm_medium=plugin_links&utm_campaign=image_watermark" rel="nofollow ugc">Docs</a>
<h4>🍬 Wanna try admin side?</h4>
<a href="https://berocket.com/woocommerce-products-image-watermark/?utm_source=wordpress_org&utm_medium=admin_demo&utm_campaign=image_watermark#try-admin" rel="nofollow ugc">Admin Demo</a> – Get access to this plugin’s admin and try it from inside. Change things and watch how they work.
<h4>Premium plugin video</h4>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/SrIhU35n0P0?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe> 
we don’t have video with free plugin right now but we are working on it
<h4>Compatibility with WooCommerce plugins</h4>
Product Watermark for WooCommerce has been tested and compatibility is certain with the following WooCommerce plugins that you can add to your site:
🔸 <a href="https://wordpress.org/plugins/woocommerce-ajax-filters/" rel="ugc">Advanced AJAX Product Filters</a> 
🔸 <a href="https://wordpress.org/plugins/load-more-products-for-woocommerce/" rel="ugc">Load More Products for WooCommerce</a> 
🔸 <a href="https://wordpress.org/plugins/gridlist-view-for-woocommerce/" rel="ugc">Grid/List View for WooCommerce</a> 
🔸 <a href="https://wordpress.org/plugins/product-preview-for-woocommerce/" rel="ugc">Product Preview for WooCommerce</a> 
🔸 <a href="https://wordpress.org/plugins/products-compare-for-woocommerce/" rel="ugc">Products Compare for WooCommerce</a> 
🔸 <a href="https://wordpress.org/plugins/sales-report-for-woocommerce/" rel="ugc">Sales Report for WooCommerce</a> 
🔸 <a href="https://wordpress.org/plugins/wish-wait-list-for-woocommerce/" rel="ugc">Wishlist and Waitlist for WooCommerce</a>

Product Watermark for WooCommerce

Yes, it worked perfectly on my client's website. Thank you so much guys!

This plugin really works!

Allows you to add watermark to images that applied to products

Watermark Hotlink Protection vs Product Watermark for WooCommerce