ChrisHurst

MyWebsiteAdvisor

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

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.

Simple Watermark vs Watermark RELOADED