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

Umar

Logics Fort

<a href="http://www.logicsfort.com/plugins/image-watermark-wp/" rel="nofollow ugc">Image Watermark WP</a> that protects your photos quickly! Image Watermark WP plugin allows you to watermark any of your photos with a variety set of options.
For more information, check out plugin page at <a href="http://www.logicsfort.com/" rel="nofollow ugc">LogicsFort</a>, <a href="https://www.logicsfort.com/docs/image-watermark-wp" rel="nofollow ugc">documentation page</a> or plugin <a href="http://www.logicsfort.com/support/forum/image-watermark-wp/" rel="nofollow ugc">support forum</a>.
<h4>Features include:</h4>
<ul>
<li>Apply watermark option in Media Library actions</li>
<li>Choose the position of watermark image</li>
<li>Upload custom watermark image</li>
<li>Watermark image preview</li>
<li>Set watermark offset</li>
<li>Select post types where watermark will be applied to images or select adding watermark during any image upload</li>
<li>Select from 3 methods of applying watermark size: original, custom or scaled</li>
<li>Set watermark transparency / opacity</li>
<li>Select image format (baseline or progressive)</li>
<li>Set image quality</li>
<li>Protect your images from copying via drag&drop</li>
<li>Gets the job done without tweaking.</li>
<li>Easy to learn and use</li>
</ul>

Image Watermark WP

This is Awesome Plugin For Watermark in WordPress, no one can beat the features. Many thanks for developer



Awsome Plugin For Watermark

Is the only watermark plugin which works out of the box for me. i needed a solution for just certain posttypes. and this even works with s3 offload lite plugin. nice!



works out of the box

Image Watermark WP that protects your photos quickly!

Simple Watermark vs Image Watermark WP