ChrisHurst

MyWebsiteAdvisor

This plugin allows you to watermark your previously uploaded images using a PNG image file with transparency as well as text signature. 
The user friendly settings page allows for control over the appearance of your watermark. 
You can set your watermarks to always be a specific percentage of the target image. 
This plugin will add the watermarks to ALL of the images in your WordPress uploads directory.
Please BACK UP all of your uploads via FTP before using this plugin!
<a href="http://mywebsiteadvisor.com/plugins/bulk-watermark/" rel="nofollow ugc">Upgrade to Bulk Watermark Ultra</a> for advanced 
watermark features including:
<ul>
<li>Fully Adjustable Text and Image Watermark Positions</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>
Check out the <a href="http://www.youtube.com/watch?v=XkFXBjfzw2I&hd=1" rel="nofollow ugc">Bulk Watermark Plugin for WordPress Video Tutorial</a>:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/XkFXBjfzw2I?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&hd=1&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Developer Website: http://MyWebsiteAdvisor.com/
Plugin Support: http://MyWebsiteAdvisor.com/support/
Plugin Page: http://mywebsiteadvisor.com/plugins/bulk-watermark/
Compare Watermark Plugins: http://MyWebsiteAdvisor.com/tools/wordpress-plugins/watermark-plugins-for-wordpress/
Video Tutorial: http://mywebsiteadvisor.com/learning/video-tutorials/bulk-watermark-tutorial/
Requirements:
<ul>
<li>PHP v5.0+</li>
<li>WordPress v3.3+</li>
<li>GD extension for PHP</li>
<li>FreeType extension for PHP</li>
</ul>
To-do:

Bulk Watermark

Adds an image and/or text watermark to all uploaded images, using PNG images with transparency.

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!

Bulk Watermark vs Image Watermark WP