agnu

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).

GrandPlugins

Add Text and Image watermarks to your pictures and images easily.
The most advanced watermarking plugin for WordPress. 
The plugin offers watermarks templates for bulk watermarks and single editor for applying watermarks on single images.
<h3>Features</h3>
<ul>
<li>Watermark images using text and image watermarks, control the watermark position, rotation and repetition.</li>
<li>Customize the text watermark’s font size, font family and color.</li>
<li>Create Watermarks Templates for bulk watermarking.</li>
<li>Apply watermarks templates on bulk images selected directly from the media library.</li>
<li>Preview and apply watermarks on single image.</li>
<li>add custom fonts for text watermarks.</li>
</ul>
<iframe loading="lazy" title="WP Watermark Images - Create watermarks template" width="750" height="422" src="https://www.youtube.com/embed/W0VJE7WdirY?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
[Pro Version]
👉 <a href="https://grandplugins.com/product/wp-images-watermark/?utm_source=free" rel="nofollow ugc">Premium</a> | <a href="https://grandplugins.com/documentation/wp-watermark-images/" rel="nofollow ugc">Documentation</a> 👈
Pro version includes all free features plus:
<ul>
<li>
unlimited Watermarks Templates You can create unlimited watermarks templates.
</li>
<li>
Apply unlimited watermarks You can add unlimited watermarks in watermarks templates or single-image Watermarks Editor.
</li>
<li>
Auto Watermarks Customize watermarks templates to be applied automatically on uploaded images, You can filter the auto-apply based on the image dimension [ max|min width and height ], the image filename prefix and the image uploaded location which it can be media or posts.
</li>
<li>
Watermarks Apply Type Choose to overwrite the image or create a new watermarked image.
</li>
<li>
Watermarks Apply Sub-sizes Choose which sub-sizes to apply the watermarks on.
</li>
<li>
Backups You can choose to create backup from images before applying watermarks in case of overwriting. You can restore original images either from image single image page or bulk-restore.
</li>
<li>
Bulk images Select Select images in bulk mode based on image’s post parent. You can select posts directly or based on filters [ posts availability – posts date range – posts authors – posts terms – etc…]
</li>
<li>
Auto Resize watermarks for each different image in bulk and auto watermarking.
</li>
<li>
Select watermarks Corner Offset.
</li>
<li>
Dynamic Watermarks for WooCommerce and MasterStudy LMS.
</li>
</ul>
<h3>Check Our other plugins</h3>
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Watermark Images, Stamp Images, WooCommerce Image Watermark, Product Watermark for WooCommerce

Add Text and Image watermarks to your pictures and images easily.

Header Watermark vs Watermark Images, Stamp Images, WooCommerce Image Watermark, Product Watermark for WooCommerce