kubiq

Statistics say that WebP format can save over a half of the page weight without losing images quality. 
Convert PNG, JPG and GIF images to WebP and speed up your web, save visitors download data, make your Google ranking better.
<ul>
<li>automated test after plugin activation to make sure it will work on your server</li>
<li>works with all types of WordPress installations: domain, subdomain, subdirectory, multisite/network</li>
<li>works on Apache and NGiNX</li>
<li>image URL will be not changed so it works everywhere, in <img> src, srcset, <picture>, even in CSS backgrounds and there is no problem with cache</li>
<li>original files will be not touched</li>
<li>set quality of converted images</li>
<li>auto convert on upload</li>
<li>only convert image if WebP filesize is lower than original image filesize</li>
<li>bulk convert existing images to WebP ( you can choose folders )</li>
<li>bulk convert only missing images</li>
<li>works with `Fly Dynamic Image Resizer` plugin</li>
</ul>
<h3>Hooks for developers</h3>
<h4>itw_sizes</h4>
Maybe you want to disable WebP for thumbnails
<pre><code>add_filter( 'itw_sizes', 'disable_itw_sizes', 10, 2 );
function disable_itw_sizes( $sizes, $attachmentId ){
 unset( $sizes['thumbnail'] );
 return $sizes;
}
</code></pre>
<h4>itw_htaccess</h4>
Maybe you want to modify htaccess rules somehow
<pre><code>add_filter( 'itw_htaccess', 'modify_itw_htaccess', 10, 2 );
function modify_itw_htaccess( $rewrite_rules ){
 // do some magic here
 return $rewrite_rules;
}
</code></pre>
<h4>itw_abspath</h4>
Maybe you use roots.io/bedrock or other custom folder structure
<pre><code>add_filter( 'itw_abspath', 'modify_itw_abspath', 10, 2 );
function modify_itw_abspath( $abspath ){
 return trailingslashit( WP_CONTENT_DIR );
}
</code></pre>
<h4>$images_to_webp->convert_image()</h4>
Maybe you want to automatically generate WebP for other plugins
<pre><code>add_action( 'XXPLUGIN_image_created', 'XX_images_to_webp', 10, 2 );
function XX_images_to_webp( $image_path ){
 global $images_to_webp;
 $images_to_webp->convert_image( $image_path );
}
</code></pre>

Images to WebP

Great

Convert PNG, JPG and GIF images to WebP and speed up your web

Benjamin Intal

gambitph

Optimize all your images instantly and for free.
<a href="https://wpcimo.com/?utm_source=plugin-directory&utm_medium=plugin-page&utm_campaign=readme-txt" rel="nofollow ugc">Cimo</a> is a game-changer for media optimization. It optimizes, resizes, and converts your images instantly as you upload — even before the files are added to your Media Library.
<a href="https://wpcimo.com/?utm_source=plugin-directory&utm_medium=plugin-page&utm_campaign=readme-txt" rel="nofollow ugc">Visit Cimo’s website</a> to learn more about how Cimo does things.
From WordPress’ point of view, it’s as if you optimized your image BEFORE your uploaded it. Now, this is next-next-gen image optimization.
<a href="https://wpcimo.com/?utm_source=plugin-directory&utm_medium=plugin-page&utm_campaign=readme-txt" rel="nofollow ugc">Cimo</a> works like magic, drag your large image file, and an optimized image will automatically appear in your Media Library. This ensures your website load speed is perfectly optimized by keeping image sizes minimal, without compromising quality.
<ul>
<li>Unlimited usage – upload as many images as you want</li>
<li>Instant optimization – virtually no waiting time</li>
<li>No extra server load</li>
<li>No extra bandwidth</li>
<li>No external image-processing services</li>
</ul>
<blockquote>
Note: Cimo works in all modern browsers (Chrome, Firefox, Edge, Opera). Image optimization currently doesn’t work in Safari, images would just upload as they normally would, please use any of the browsers listed.
</blockquote>
Image Optimization options:
<ul>
<li>WebP quality – set the quality level for WebP conversion (1-100), defaults at 80%</li>
<li>Max image dimension – automatically resize images to a maximum dimension while preserving aspect ratio</li>
<li>WordPress automatic scaling – disable WordPress’s built-in 2560px image scaling</li>
<li>Thumbnail generation – disable all WordPress thumbnail generation to save disk space</li>
<li>Individual thumbnail sizes – selectively enable/disable specific thumbnail sizes</li>
<li>Preset configurations – one-click “Recommended” settings for optimal performance</li>
<li>Statistics dashboard – view total storage saved, compression ratio, and optimization metrics</li>
</ul>
<h4>How to use</h4>
Just upload images to your Media Manager as you normally would, then Cimo instantly optimizes the images to the next-gen format WebP on your browser during the upload process, the resulting optimized file is the one saved to your WordPress site. It’s amazing!
<h4>Why use Cimo?</h4>
<ol>
<li>Completely Free & Unlimited – Image optimization and compression are completely free with no quotas, no limits, and no paywalls. Optimize as many images as you want, forever.</li>
<li>Instant, Lightning-Fast Processing – Images are optimized instantly in your browser as you upload, with no waiting for server-side or external processing.</li>
<li>Privacy-First – Your images never leave your device until they’re uploaded to WordPress. No third-party servers, no external processing, complete control over your media.</li>
<li>Zero Server Load – All optimization happens in your browser, so your website and server stay fast and responsive.</li>
<li>Smart Optimization – Advanced compression algorithms deliver the best quality-to-size ratio, with automatic WebP conversion for maximum efficiency.</li>
<li>Future-Proof Format – Automatic WebP conversion ensures your images use the most efficient format, reducing file sizes by up to 80%.</li>
<li>Instant Results – Experience faster uploads, smaller file sizes, and optimized images that load faster on your website.</li>
<li>Universal Compatibility – Works seamlessly with the WordPress Block Editor, Elementor, Beaver Builder, and all major page builders.</li>
<li>Developer Friendly – Clean, lightweight code that won’t interfere with other plugins or slow down your WordPress admin.</li>
</ol>
<h4>Features</h4>
<ul>
<li>Unlimited optimization – compress and optimize without quotas</li>
<li>WebP conversion – next‑gen format without external services</li>
<li>Client‑side processing – faster uploads, no server load</li>
<li>Privacy‑first – nothing sent to third‑party servers</li>
<li>Lightweight – no API keys, no background jobs, no server processing</li>
<li>Advanced settings – full control over quality, dimensions, and thumbnail generation</li>
<li>Statistics dashboard – track storage savings and optimization performance</li>
<li>Smart presets – one-click recommended or default configurations</li>
</ul>
<h4>Works with</h4>
<ul>
<li>The native WordPress Block Editor / Gutenberg</li>
<li>Should work with any plugin, but we made sure it works with these:
<ul>
<li>Popular Page Builders
<ul>
<li>Elementor</li>
<li>Divi (partial: dropping files is not yet supported)</li>
<li>Breakdance</li>
<li>Bricks Builder</li>
<li>Oxygen</li>
<li>Beaver Builder</li>
<li>WP Bakery</li>
</ul>
</li>
<li>Popular Block Editor Builders
<ul>
<li>Stackable</li>
<li>Spectra</li>
<li>Kadence</li>
<li>Greenshift</li>
<li>GenerateBlocks</li>
</ul>
</li>
<li>Popular plugins
<ul>
<li>WooCommerce</li>
</ul>
</li>
</ul>
</li>
</ul>
Since Cimo’s optimization works during the upload process, Cimo should be compatible with any plugin that uses images
<h4>What’s in Cimo Premium?</h4>
If you upgrade to <a href="https://wpcimo.com/pricing/?utm_source=plugin-directory&utm_medium=plugin-page&utm_campaign=readme-txt" rel="nofollow ugc">Cimo Premium</a>, you will get the following:
<ul>
<li>Bulk Optimization – optimize your existing media in your Media Library in one click, no server processing as well</li>
<li>Optimize Files Uploaded via Form Plugins – automatically optimize images, videos, and audio uploaded through popular form plugins (Gravity Forms, WPForms, Ninja Forms, Formidable, Fluent Forms, etc.)</li>
<li>Video Optimization – automatically optimize and optionally downscale the resolution of videos as you upload them</li>
<li>Audio Optimization – auotmatically optimize audio files as you upload them</li>
<li>Low Quality Image Placeholders (LQIP) – for native image blocks, display a subtle image placeholder while waiting for images to load, then fade the loaded image in.</li>
<li>Stealth Mode – completely hides all Cimo branding and interface elements, while all optimization features continue to work seamlessly in the background.</li>
</ul>
<a href="https://wpcimo.com/pricing/?utm_source=plugin-directory&utm_medium=plugin-page&utm_campaign=readme-txt" rel="nofollow ugc">Visit our website</a> to learn more
Video & Audio optimization are also performed as you upload your files, even before the files are added to your Media Library.
<h3>Technical Details</h3>
<ul>
<li>Client-Side Processing: All optimization happens in the user’s browser</li>
<li>Zero Server Load: No background processes or server-side optimization</li>
<li>Instant Results: No waiting for external APIs or server processing</li>
<li>Privacy-First: Images never leave the user’s device until uploaded</li>
<li>Browser Compatibility: Works in Chrome, Firefox, Edge, Opera (Safari support not currently available)</li>
</ul>
<h3>Perfect For</h3>
<ul>
<li>Website owners who want to reduce image file sizes without quality loss</li>
<li>Administrators who have content writers who always upload big images without converting them</li>
<li>Designers who always forget to convert images first before uploading to the site</li>
<li>Content creators who upload many images and want faster uploads</li>
<li>Developers building sites that need optimized images for better performance</li>
<li>Agencies managing multiple client sites with image optimization needs</li>
<li>Anyone wanting to convert images to WebP format automatically</li>
<li>Sites where server-side image processing isn’t available or desired</li>
<li>Users who want client-side image optimization for better privacy</li>
<li>Performance-focused websites that need instant image optimization</li>
<li>Developers who want zero server load from image processing</li>
<li>Privacy-conscious users who don’t want images sent to third-party servers</li>
</ul>

Cimo – Free Instant Image Optimizer & WebP Converter


Tried this plugin, and wow, images optimized like magic, no waiting, no server load, no bandwidth, no external services. Unlimited & free, quality intact.


Superb! Works like magic.


Awesome plugin, directly goes to my default install list ! Thank you for the great work !


5 star because we cannot give more

Unlimited free image compression and WebP conversion, done instantly as you upload them. No quotas, no external servers, no limits.

Images to WebP vs Cimo – Free Instant Image Optimizer & WebP Converter