Phillip Baumgärtner

BM1 Frontend Image Replace lets you swap out images on your WordPress site without ever touching the admin panel. Simply hover over any image on the frontend, click, and upload a replacement.
Perfect for:
<ul>
<li>Replacing demo or placeholder images during development</li>
<li>Letting clients review and update images without backend access</li>
<li>Quick image swaps during content reviews</li>
</ul>
How it works:
<ol>
<li>Enable the plugin in Settings > BM1 Frontend Image Replace</li>
<li>Visit any page on your site</li>
<li>Hover over an image — a replace overlay appears</li>
<li>Click and select a new image from your computer</li>
<li>The new image is uploaded to the media library and all references in your content are updated automatically</li>
</ol>
Free features:
<ul>
<li>Works with any theme — no template modifications needed</li>
<li>Uploads new images to the WordPress media library (the original stays untouched)</li>
<li>Updates all references in post content</li>
<li>Supports Gutenberg block editor, Classic editor, and LiveCanvas</li>
<li>Lightweight — no jQuery dependency, minimal footprint</li>
<li>Translation-ready (including German)</li>
</ul>
Pro features (available at <a href="https://wp-frontend-image-replace.com" rel="nofollow ugc">wp-frontend-image-replace.com</a>):
<ul>
<li>Guest access via shareable temporary links (with expiry)</li>
<li>Activity log for all image replacements (Tools > Image Replace Log)</li>
<li>Priority support</li>
</ul>
A premium version with extended features is available at <a href="https://wp-frontend-image-replace.com" rel="nofollow ugc">wp-frontend-image-replace.com</a>.

BM1 Frontend Image Replace

Replace images directly from the frontend. Upload a new image, and it replaces the old one in your content.

lucasstad

Lucas String Replace replaces any string on any WordPress processed page with another string. 
It takes the final output of WordPress and replaces defined strings with another string.
New: Add multiple strings to replace and create mutltiple sets
<h4>You can use it, for example, for the following purposes</h4>
<ul>
<li>HTTPS Protocol Rewriting (replace any “http://domain.com” with “https://domain.com”)</li>
<li>Better WordPress (Multisite) Domain Mapping (replace any “myblog.domain.com” with “www.myblog.com”)</li>
<li>Replace or add HTML to a specific place</li>
<li>Make changes or add contents to your sitemap.xml (non-static, tested with XML Sitemap Generator) or to your robots.txt</li>
<li>Repace or change anything made out of letters and numbers…</li>
</ul>
<h4>Please note</h4>
<ul>
<li>Lucas String Replace can slow down your website speed. It is recommended to use it in combination with a caching plugin to keep your website fast.</li>
</ul>

Lucas String Replace

Does what "Say what?" does not do: change widget titles too

Pretty neat

Change anything: Lucas String Replace takes the final output of WordPress and replaces the defined strings with another string

BM1 Frontend Image Replace vs Lucas String Replace