MyWebsiteAdvisor

ChrisHurst

This plugin allows you to Automatically add a watermark to all images as they are viewed on your WordPress Website. 
Watermarks are not 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!
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.
This plugin needs to add to your .htaccess file, and will not work if you do not have a .htaccess file or mod_rewrite.
NOTE: 
This plugin may have a slight impact on the performance of your web server, use of the Included Basic Caching System is Highly Recommended! 
The premium version of this plugin also includes an Advanced Cache System which performs nearly identical to when the plugin is disabled.
<a href="http://MyWebsiteAdvisor.com/tools/wordpress-plugins/simple-watermark/" rel="nofollow ugc">Upgrade to Simple Watermark Ultra</a> for advanced 
watermark features including:
<ul>
<li>Improved Performance with Advanced Cache</li>
<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/simple-watermark/
Requirements:
<ul>
<li>PHP v5.0+</li>
<li>WordPress v3.3+</li>
<li>GD extension for PHP</li>
<li>FreeType extension for PHP</li>
<li>.htaccess file and mod_rewrite</li>
</ul>
To-do:

Simple Watermark

Automatically watermark images as they are viewed

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

Simple Watermark vs Product Watermark for WooCommerce