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).

sverde1

Watermark RELOADED is a lightweight WordPress image watermark plugin that automatically adds a customizable text watermark to images when you upload them to your Media Library.
Use it to:
<ul>
<li>Protect your work from unauthorized reuse</li>
<li>Brand images with your site name, URL, or copyright notice</li>
<li>Keep control of your visual content with a simple, set-and-forget solution</li>
</ul>
You can:
<ul>
<li>Choose which image sizes to watermark: thumbnail, medium, large, full size</li>
<li>Customize text watermark font and color</li>
<li>Precisely control watermark position (corners, edges or centered) on the image</li>
<li>Preview your watermark before saving settings so you know exactly how it will look</li>
</ul>
The plugin adds:
<ul>
<li>A dedicated Watermark RELOADED settings page where you configure your watermark and see a live preview</li>
<li>A WordPress Dashboard widget that shows your current watermark settings and a preview of the watermark directly on the main Dashboard screen</li>
</ul>
<h3>Key Features</h3>
<ul>
<li>Automatic watermark on upload – newly uploaded images are watermarked immediately</li>
<li>Text watermarking – add copyright text, site name or any custom message</li>
<li>Custom fonts – upload your own TTF fonts to use for the watermark</li>
<li>Color picker integration – choose any text color for your watermark</li>
<li>Per-size control – enable watermarking only on selected image sizes</li>
<li>Live settings preview – see how your watermark text, color and position look in the plugin settings before they are applied to new uploads</li>
<li>Dashboard widget – quickly review enabled sizes, position, offset and a preview from the WordPress Dashboard</li>
<li>Simple, focused UI – no unnecessary settings, just what you need to protect your images</li>
</ul>
<h3>How it works</h3>
<ol>
<li>You configure your watermark text, font, color, and position in Settings → Watermark Reloaded.</li>
<li>You choose which image sizes should receive the watermark.</li>
<li>When you upload a new image through the Media Library or post editor, Watermark RELOADED automatically applies the text watermark to the selected sizes.</li>
</ol>
Existing images in your Media Library are not modified – only new uploads are processed.
<h3>Requirements</h3>
To generate watermarks, your server must support:
<ul>
<li>PHP 5.3+</li>
<li>GD extension for PHP</li>
<li>FreeType Library (for rendering text)</li>
</ul>
If any of these are missing, the plugin will show an error message so you can contact your hosting provider.
<h3>Planned improvements</h3>
The following ideas are on the to-do list and may be implemented in future updates:
<ul>
<li>Additional bug fixes and compatibility adjustments</li>
<li>Smarter handling of small images where the watermark might overflow</li>
<li>Support for watermarking additional custom image sizes added by other plugins/themes</li>
<li>Image-size aware watermarks and more flexible positioning options</li>
</ul>

Watermark RELOADED

Automatically add customizable text watermarks to new images on upload to protect your WordPress media library.

Header Watermark vs Watermark RELOADED