levmedia123

<p>Shrinkwell Image Optimizer helps WordPress site builders optimize images locally, without an external API or account. It compresses JPEG/PNG images, creates WebP and AVIF versions where supported, keeps original backups, checks image SEO, and gives clear proof of delivery and savings.</p>
<p>Use the safe 5-image test first, review the result, then optimize the full media library with more confidence.</p>
<h4>Local-first optimization</h4>
<ul>
<li>Automatically optimize JPEG and PNG uploads on upload.</li>
<li>Preserve existing WebP media items instead of recompressing them.</li>
<li>Choose from Balanced, High compression, Near lossless, or Custom compression profiles.</li>
<li>Use controlled compression settings designed to preserve quality while reducing file size.</li>
<li>Resize oversized images to a maximum width and height.</li>
<li>Optimize thumbnails and strip image metadata/EXIF where possible.</li>
</ul>
<h4>Safe media library workflow</h4>
<ul>
<li>Run a safe 5-image optimization test before committing to a full media library run.</li>
<li>Optimize existing images directly from Media > Shrinkwell.</li>
<li>Review saved space, skipped files, and recent results before continuing.</li>
</ul>
<h4>WebP and AVIF delivery checks</h4>
<ul>
<li>Generate WebP versions when supported by your server.</li>
<li>Generate AVIF versions when the local AVIF encoder and safety checks pass.</li>
<li>Use the local <code>cwebp</code> binary when available, with WordPress image editor fallback.</li>
<li>Generate missing WebP files without recompressing originals.</li>
<li>Serve AVIF first, then WebP, with safe JPEG/PNG fallback markup.</li>
</ul>
<h4>Page Proof reports</h4>
<ul>
<li>Run a Page Proof scan on a live frontend page to verify modern image delivery, estimate image payload savings, and identify cached JPG/PNG URLs.</li>
<li>Copy or download a plain-text proof report for your own checks or client handoff.</li>
</ul>
<h4>Image SEO Check</h4>
<ul>
<li>Find images with missing alt text, weak alt text, and weak filenames.</li>
<li>Use safe one-click alt text suggestions when Shrinkwell has a reliable source.</li>
<li>Avoid blindly reusing random filenames, GUIDs, or camera-style names as SEO text.</li>
<li>Save alt text inline without leaving the Shrinkwell screen.</li>
</ul>
<h4>Backups & Restore</h4>
<ul>
<li>Keep original backups before replacing any files.</li>
<li>Restore all optimized images at once from a single screen.</li>
</ul>
<h4>Quick Start</h4>
<ol>
<li>Install Shrinkwell and open Media > Shrinkwell.</li>
<li>Run the 5-image safe test.</li>
<li>Review savings, skipped files, and backups.</li>
<li>Run Media Optimization for the full media library.</li>
<li>Use Page Proof to verify WebP/AVIF delivery on a real frontend page.</li>
</ol>
<h4>Insights & Logging</h4>
<ul>
<li>View optimization status directly in the Media Library list view.</li>
<li>Review an optimization log showing saved bytes, WebP/AVIF counts, and skipped files with clear reasons such as file size, dimensions, and processing limits.</li>
<li>Review current settings from the Overview page at a glance.</li>
</ul>
<h4>Settings & Recommendations</h4>
<ul>
<li>Configure everything from the Shrinkwell admin page under Media > Shrinkwell.</li>
<li>Scan your media library and receive tailored setting recommendations for your site.</li>
<li>Apply recommended settings in one click after scanning.</li>
<li>Scan for image SEO issues without automatically modifying content.</li>
</ul>
<p>Review prompts appear only after Shrinkwell has produced measurable results.</p>
<h4>What Shrinkwell Does Not Do</h4>
<ul>
<li>Does not send images to an external optimization service for core local features.</li>
<li>Does not require an account for free local optimization.</li>
<li>Does not automatically rewrite SEO content.</li>
</ul>
<h3>Privacy</h3>
<p>Shrinkwell optimizes images locally on your WordPress server. Core optimization never sends media files to an external API.</p>
<h3>License & Assets</h3>
<p>Shrinkwell is licensed under GPLv2 or later.</p>
<p>The included Shrinkwell logo and wordmark are original Levmedia brand assets and are distributed with this plugin under GPLv2 or later.</p>


Shrinkwell Image Optimizer

Free local image optimization for WordPress. No account. No external API. WebP/AVIF, backups, SEO checks, and proof reports included.

Takis Bouyouris

takisbig

<h4>Adaptive Images</h4>
<p>Resizes and optimizes images delivered to mobile devices, in a transparent way, so that the total download time is dramatically reduced. It works as a filter between your WordPress website and the devices and seves smaller images to them.</p>
<p>Note that this is not a CSS nor a responsive images solution. It does not affect your themes layout and style. It simply sends smaller images to the devices without them noticing it!</p>
<h4>Fundamental goals</h4>
<ol>
<li>Reduce the total download time of a web page in mobile devices dramatically.</li>
<li>Work transparantly and unobtrusively by being independant of your theme layout and style.</li>
<li>Be agnostic of the yet not-standardised <code>picture</code> element or HTML the img <code>srcset</code> attribute.</li>
</ol>
<h4>Side benefits</h4>
<ol>
<li>Respects search engines and sends them the orginal version of each image.</li>
<li>If it does not recognise a device size it falls back to the original image size.</li>
<li>It is lightweight, because it does not need to load the whole WordPress environment every time it server an image request.</li>
</ol>
<h4>Supported formats</h4>
<ul>
<li>JPEG</li>
<li>PNG</li>
<li>GIF (not animated)</li>
</ul>
<h4>NOT Supported formats</h4>
<ul>
<li>WEBP</li>
<li>GIF (animated)</li>
</ul>
<h4>CDN/Varnish/Nginx/external caching services</h4>
<p>Since version 0.6.0 CDN/Varnish/external caching service support has been added as an option, in an <strong><em>experimental</em></strong> mode. This means: i) it is not thorougly tested yet ii) however, it works in almost all test cases so far iii) it bears no dangers to your installation iv) it adds a special url parameter to your image urls, so it is slightly obtrusive.</p>
<ul>
<li>Tested with MaxCDN, Varnish and Nginx up to now. </li>
<li>Cannot handle CSS background images in this mode (yet). </li>
</ul>
<p>Cannot work, not even in experimental mode, with CDNs which use a different subdomain for images, because these setups completely bypass WordPress when delivering images. Feel free to ask for details on this in the support forum.</p>
<h4>Default breakpoints</h4>
<ul>
<li>1024px wide screens</li>
<li>640px wide screens</li>
<li>480px wide screens</li>
</ul>
<p>Since version 0.5.0 and upwards it is configurable whether the plugin should take into account the landscape or the portrait orientation of each device. HiDPI (high device pixel density or retina) screens are supported too.</p>
<h4>How to test</h4>
<p>The esiest way to test is with your browser's device emulation mode (Responsive Design Mode) in it' Developer Tools. You can check this out in this video https://www.youtube.com/watch?v=hCAC1XUUOvw/ as an example.</p>
<ol>
<li>Test with a tool like Webpagetest http://www.webpagetest.org/. Make sure you set the “Emulate Mobile Browser” setting in the “Advanced Settings” > “Chrome” tab. </li>
<li>Test with an actual mobile device, a smartphone or tablet. Watch your website load in a snap.</li>
<li>Check the <code>/wp-contents/cache</code> directory to see the <code>/adaptive-images</code> directory and its contents. This is where the resized images are kept and cached by default.</li>
<li>View an image straight from a browser and add a "?debug=true" at the end of the url like this "http://www.website.com/wp-content/uploads/2015/01/image.jpg?debug=true". This verifies that the plugin is working and should print useful debug information. If you keep seeing your image, then the plugin is not working as expected and the cause is probably a failure to update the .htaccess file properly.</li>
<li>Add a "?debug=original" at the end of the url of an image and you will see the orginal version of the image even when a smaller version of it should have been shown.</li>
</ol>
<h4>Incompatibilities and issues</h4>
<ul>
<li>
<p>The plugin supports Nginx, if it is used as the main server, not as a caching server, but the server’s configuration file must be manually configured like this:</p>
<p><code>location / {<br />
rewrite \.(?:jpe?g|gif|png)$ /wp-content/plugins/adaptive-images/adaptive-images-script.php;<br />
}</code></p>
</li>
<li>
<p>Windows IIS is not supported, but could be manually configured. Any IIS experts are welcome to contribute.</p>
</li>
<li>Cannot work, not even in experimental mode, with CDNs which use a different subdomain for images. </li>
<li>When using HTTPS/SSL make sure that you update all your website urls and also the urls in your WordPress General<br />
settings page, otherwise the plugin will not be able to locate your images. </li>
<li>WordPress Multisite (Mu) is not supported (some plans for future support are being discussed).</li>
</ul>
<h4>Stuff to keep in mind</h4>
<ul>
<li>The plugin needs to add a little bit of code to your <code>.htaccess</code> file in order to function properly. It removes this code once disabled. If you are not cool with that, then… tough luck! </li>
<li>The plugin does not care whether the device is actually mobile or not. It checks the device screen resolution. If you have set your breakpoints big enough then it should work just as good for desktop devices as well. However, it targets mostly the mobile ones.</li>
<li>The resized versions of the pictures are kept in a special directory in the <code>/wp-content/cache</code> directory. This causes some storage overhead. It is up to you to judge whether this overhead is a sustainable option in your hosting environment. Usually it is not even remotely compared to the size of your original images directories.</li>
<li>The plugin does not help with (nor hinder) art direction. Simple as that. Art direction https://usecases.responsiveimages.org/#art-direction in responsive images is an entirely different, yet important, problem. This plugin does not tackle with it. But it works in a supplementary way without interfering with other solutions that do. This means that you can combine it with any art direction solution.</li>
</ul>
<h4>Credits</h4>
<ul>
<li>The plugin was originally based on the WP-Resolutions plugin https://github.com/JorgenHookham/WP-Resolutions/, but since version 0.3.0 it is a complete rewrite!</li>
<li>Both plugins, WP-Resolutions and this one, have borrowed ideas from the Adaptive Images http://adaptive-images.com/ solution, specially adapted for WordPress.</li>
<li>Many special thanks to my good friend and colleague Antonis Zachopoulos for the countless times that he provided feedback, ideas and debugging hints.</li>
<li>Many thanks to @railgunner for the initial idea on the CDN/Varnish/external caching service feature in the plugin support forum. It showed the way that it was indeed possible!</li>
<li>Thank you AJ at WpFASTER.org for being keen to test the above feature in a real environment.</li>
<li>Thank you to the guys over at the Pressidium team for helping with debugging the CDN/Varnish/external caching service feature and providing test environments.</li>
<li>Thank you Andy Gray for helping debugging the weird filesystem path issues in managed hosting environments.</li>
<li>Thank you @milenoi2016 for helping sort out one of the many cases of WordPress directories setup.</li>
<li>Thank you @minorgod for the Windows path fix.</li>
<li>Thank you Mark Gruffer for the global request variable exposure hint. </li>
<li>Thank you @timholz for the SameSite cookie hint.</li>
<li>Thank you @blackcapdesign for spotting the regular expression issue in version 0.6.70 and helping debug it.</li>
<li>Lastly, a million thanks to all of you who provided useful feedback in the early versions of the plugin, where the inevitable glitches, due to server environment variations, were more than a few.</li>
</ul>
<p>Please, do let us know how the plugin works (or doesn’t work) for you. We love comments and creative feedback!</p>


Adaptive Images for WordPress

It appears, that the plugin gets the incorrect path for the file adaptive-images-script.php:
https://192.168.10.55/wordpress/C:xampphtdocswordpresswp-contentpluginsadaptive-images/adaptive-images-script.php

Does not work properly on xampp/windows platform

Adaptive images plugin transparently resizes your images, per device screen size, in order to reduce download times in mobile environments.

Shrinkwell Image Optimizer vs Adaptive Images for WordPress