WPMU DEV - Your All-in-One WordPress Platform

Alex Dunae

<p><strong>Compress images, optimize images, and enable image lazy load automatically with the powerful Smush image optimizer to keep your WordPress site fast, without losing quality.</strong></p>
<p>Smush makes it easy to optimize images, compress images, and deliver images faster across your entire WordPress site. This all-in-one image optimizer automatically reduces image file sizes, enables image lazy load, and serves modern formats like WebP and AVIF, all without breaking image quality or adding extra work.</p>
<p>Whether you’re running a blog, store, or portfolio, Smush helps you optimize images at scale and keep your site fast with a trusted WordPress image optimizer.</p>
<p><strong>Trusted by 1+ Million Sites | 4.8/5 Star Rating</strong></p>
<p>Get everything you need to optimize images and speed up your site. Smush works out of the box with no complicated setup – just install and let it handle the rest.</p>
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/4E5PgBsi6eI?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></span>
<h3>Compress images without losing quality</h3>
<p>Reduce image file size automatically while keeping your images sharp and clear. Smush is an easy-to-use image optimizer which let’s you compress images using both lossless and lossy compression, giving you the best balance of quality and performance without extra work.</p>
<p>You can also compress images outside the media library using Directory Smush, making it easy to optimize images stored in theme folders, plugins, or other directories on your server.</p>
<h3>Lazy load images for faster pages</h3>
<p>Enable image lazy load across your site so images load only when needed. This image optimizer improves initial page speed and creates a smoother experience for visitors without extra configuration.</p>
<h3>Serve WebP and AVIF images automatically (<a href="https://wpmudev.com/project/wp-smush-pro/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=smush-readme-next-gen" rel="nofollow ugc">PRO</a>)</h3>
<p>Convert images to WebP and AVIF and serve them automatically to supported browsers. Smush helps you optimize images using next-gen formats to reduce file size and improve load times across your WordPress site.</p>
<h3>Deliver images faster with an Image CDN (<a href="https://wpmudev.com/project/wp-smush-pro/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=smush-readme-cdn" rel="nofollow ugc">PRO</a>)</h3>
<p>Serve images through a global image CDN to reduce latency and improve load times for visitors around the world.</p>
<ul>
<li>119 global CDN servers</li>
<li>Up to 500 GB of bandwidth</li>
<li>Faster image delivery based on visitor location</li>
<li>Improved performance for image-heavy and high-traffic sites</li>
</ul>
<h3>Automatically resize and fix image dimensions (<a href="https://wpmudev.com/project/wp-smush-pro/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=smush-readme-auto-resize" rel="nofollow ugc">PRO</a>)</h3>
<p>Eliminate common PageSpeed warnings and improve layout stability with automatic image sizing. Smush dynamically resizes images to perfectly fit their containers, regardless of original size, helping fix the “Properly size images” warning in Google PageSpeed Insights.</p>
<p>It also automatically adds missing width and height attributes to your images, improving rendering speed and reducing layout shifts. This helps you meet the “Ensure images have explicit width and height” recommendation without any manual work.</p>
<h3>Optimize your entire site, automatically</h3>
<p>Smush works across your whole site as a powerful image optimizer to optimize images as you upload them and maintain performance over time without manual work.</p>
<ul>
<li>Optimize images automatically on upload</li>
<li>Compress images in bulk or individually</li>
<li>Works with your existing media library</li>
<li>No need to re-upload images</li>
<li>Enable image lazy load across your site</li>
<li>Convert images to WebP and AVIF</li>
<li>Deliver images with an integrated image CDN</li>
<li>Automatically resize and serve correctly sized images</li>
<li>Optimize images outside the media library with Directory Smush</li>
</ul>
<h3>Built for performance</h3>
<p>Smush improves page speed and overall performance by reducing image weight and improving how images are delivered.</p>
<ul>
<li>Reduce page load times</li>
<li>Improve user experience</li>
<li>Better performance for image-heavy pages</li>
<li>Supports image lazy load and preload images (PRO) for faster perceived performance</li>
</ul>
<h3>Works with your existing setup</h3>
<p>Smush is built to work with your current WordPress setup, including popular themes, page builders, and plugins.</p>
<ul>
<li>Compatible with Gutenberg, Elementor, WPBakery, and more</li>
<li>Works with WooCommerce stores</li>
<li>No need to change your workflow</li>
<li>Easy to enable and configure</li>
</ul>
<h3>Designed to be simple</h3>
<p>You don’t need to be a performance expert to optimize images with Smush image optimizer.</p>
<ul>
<li>Works out of the box</li>
<li>Simple settings when you need them</li>
<li>No technical knowledge required</li>
<li>Safe to use on any site</li>
</ul>
<h3>Why choose Smush?</h3>
<p>There are plenty of image optimization plugins, but Smush focuses on making it easy to optimize images, compress images, and improve performance without complexity. As a leading WordPress image optimizer, Smush gives you powerful optimization tools without the technical hassle.</p>
<ul>
<li>Trusted by over 1 million WordPress users</li>
<li>Built specifically for WordPress</li>
<li>Regular updates and improvements</li>
<li>Backed by the WPMU DEV team</li>
</ul>
<h3>Get started in minutes</h3>
<p>Install Smush, activate it, and start to compress images, optimize images, and enable image lazy load right away. This easy-to-use image optimizer helps most sites see improvements immediately without changing how they upload or manage images.</p>
<h3>About Us</h3>
<p>WPMU DEV is a premium supplier of quality WordPress plugins, services and support. Learn more here:<br />
<a href="https://wpmudev.com/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=smush-readme&utm_content=wpmu_dev_link" rel="nofollow ugc">https://wpmudev.com/</a></p>
<p>Don’t forget to stay up to date on everything WordPress from the Internet’s number one resource:<br />
<a href="https://wpmudev.com/blog/?utm_source=wordpress.org&utm_medium=readme&utm_campaign=smush-readme&utm_content=wpmu_dev_blog_link" rel="nofollow ugc">WPMU DEV Blog</a></p>
<p>Hey, one more thing… we hope you <a href="https://profiles.wordpress.org/wpmudev/#content-plugins" rel="nofollow ugc">enjoy our free offerings</a> as much as we’ve loved making them for you!</p>
<h3>Contact and Credits</h3>
<p>Originally written by Alex Dunae at Dialect (<a href="http://dialect.ca/?wp_smush_it" rel="nofollow ugc">dialect.ca</a>, e-mail ‘alex’ at ‘dialect dot ca’), 2008-11.</p>


Smush – Image Optimization, Compression, Lazy Load, WebP & CDN

Thank you for taking over half of the WordPress dashboard with your giant ad. It motivated me to remove your plugin and install EWWW Image Optimizer instead.

Huge black friday Ad. Stop advertising on my dashboard.


Unfortunately, it does not support WordPress Multisite and Arabic Language.


Does not support WodPresss Multisite and Arabic Language

Compress and optimize images, enable lazy load, serve WebP & AVIF, and speed up your site with a global image CDN.

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.

Smush – Image Optimization, Compression, Lazy Load, WebP & CDN vs Adaptive Images for WordPress