ChrisHurst

MyWebsiteAdvisor

This plugin allows you to Automatically displays a watermark on images which have been hotlinked as they are viewed on the Hotlinkers Website. 
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. 
Watermarks are non-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!
<a href="http://MyWebsiteAdvisor.com/tools/wordpress-plugins/watermark-hotlink-protection/" rel="nofollow ugc">Upgrade to Watermark Hotlink Protection Ultra</a> for advanced 
watermark features including:
<ul>
<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/watermark-hotlink-protection/
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:

Watermark Hotlink Protection

Displays a watermark on images which have been hotlinked

Freemius

ShawonPro

SocialMark is a WordPress plugin that allows adding overlay/watermark to social media post link share preview. It gives the option to use different images for social media (Twitter, Facebook) and add overlay/watermark to the preview. The plugin enables 2 different watermark positions(9 in premium version) to set overlay at different places on the post image. There are two settings options: universal settings for all posts and pages, post-wise settings for individual page/post. SocialMark also works with Yoast SEO and RankMath plugin’s open graph settings. Add sponsored image on your social media news/post preview easily.
<h3>SocialMark Plugin Features:</h3>
<ul>
<li>
Automatic Process: The plugin will generate different SocialMark image based on your settings.</li>
<li>Auto Resize: Automatically resize image based on aspect ratio</li>
<li>Different Position: You can set your watermark/overlay from 2 different positions on your featured image</li>
<li>Transparent Image: Overlay image can be transparent</li>
<li>Extensive Settings: 1 Setting all posts/pages.</li>
<li>Unlimited Overlay/Watermark: Upload unlimited overlay/watermark image and choose the one you need from the list</li>
<li>Enable/Disable: It is posible to enable or disable SocialMark all posts and pages</li>
<li>Transparent Overlay Support: Overlay image can be tranparent</li>
<li>Yoast SEO Supported: This plugin can generate image for Yoast SEO plugin open graph meta also</li>
<li>RankMath Supported: Automatically generate Twitter and Facebook image for RankMath plugin
</li>
<li>Change og:image for: JetPack, All in one SEO, SEO press, OG, Open Graph and Twitter Card Tags, graphite, and all other plugins.
</li>
</ul>
<h3>[+] SocialMark Premium Version Extra Features – Only $14.90/year:</h3>
<a href="https://shawonpro.com/socialmark-wp-plugin/" rel="nofollow ugc">Buy Premium Version</a>
<ul>
<li>All Free Features plus</li>
<li>Different Position: Add overlay/watermark to your social media post preview image at 9 different positions.</li>
<li>Post-wise Settings: You can set different overlay for every post/page individually.</li>
<li>Category-wise Settings: You can set different overlay for specifice category’s posts.</li>
<li>WooCommerce: You can set overlay and different featured image for WooCommerce product for social media.</li>
<li>Custom Post Type Support: Enable/Disable SocialMark for custom post types such as property, car, directory etc. </li>
<li>Disable for old posts: Disable SocialMark for old posts by entering a date.</li>
<li>Different Feature Image: You can upload different feature image only for social media</li>
<li>Enable/Disable: It is posible to enable or disable SocialMark for any post or page individually as well as enable/disable all posts/pages</li>
<li>Full Width Image Auto Generation: Full width image generation with background color for square size and portrait images</li>
<li>Regular Feature Update: We usually add customer requested complex features exclusively on premium version</li>
</ul>
<h3>SocialMark Installation:</h3>
<iframe loading="lazy" class="youtube-player" width="560" height="315" src="https://www.youtube.com/embed/gouRK9R6psU?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h3>SocialMark Demo:</h3>
<a href="https://shawonpro.com/socialmark-wp-plugin/" rel="nofollow ugc">Check live demo</a>
<h3>Installation:</h3>
<ul>
<li>From the WP admin panel, click “Plugins” -> “Add new”</li>
<li>In the browser Click on “Upload Plugin”</li>
<li>Choose the “socialmark” plugin zip file and click “Install Now”</li>
<li>Activate the plugin</li>
<li>Go to SocialMark Plugin Settings or Click “SocialMark” from admin menu</li>
<li>Add Overlay</li>
<li>Select plugin options</li>
<li>Save Changes</li>
<li>You are ready to go</li>
<li>Alternatively, you can manually upload the plugin to your wp-content/plugins directory</li>
<li>Don’t forget to add feature image to your post </li>
<li>Easy way to test social media open graph preview https://www.opengraph.xyz/</li>
</ul>

SocialMark – Easy Watermark/Logo on Social Media Post Link Share Preview

Add your logo/watermark/overlay to your wordpress social media post share link preview(open graph image). It will not change your website image view.

Watermark Hotlink Protection vs SocialMark – Easy Watermark/Logo on Social Media Post Link Share Preview