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Welcome to Henkan (Japanese for “conversion”) — your lightweight, high-performance solution for next-generation image optimization in WordPress!
Slow loading times and heavy images are a thing of the past. Henkan seamlessly integrates into your WordPress dashboard, silently converting your standard JPEGs and PNGs into highly optimized WebP or AVIF files. Boost your Core Web Vitals, improve your SEO rankings, and save massive amounts of server bandwidth without sacrificing an ounce of image quality.
<h3>✨ Why choose Henkan?</h3>
Most image optimizers rely on slow PHP processing or expensive cloud APIs with monthly limits. Henkan is built differently: It prioritizes native OS binaries (<code>cwebp</code>, <code>avifenc</code>) to process images blazingly fast directly on your own server, completely free and without any restrictions.
<h3>🚀 Powerful Features</h3>
<ul>
<li>Next-Gen Formats: Instantly convert images to WebP and AVIF formats.</li>
<li>Zero-Config Auto-Conversion: New images are optimized silently in the background the moment you upload them.</li>
<li>1-Click Bulk Optimization: Got a massive existing media library? Process thousands of images with a single click in our beautiful, modern dashboard.</li>
<li>Smart Fallbacks: Uses ultra-fast <code>exec()</code> binaries when available, falling back to GD or ImageMagick seamlessly if needed.</li>
<li>Cache Auto-Clear: Fully compatible with WP Rocket, W3 Total Cache, Autoptimize, and LiteSpeed Cache. Conversions automatically trigger a cache purge.</li>
<li>Frontend Delivery: Automatically serves the optimized images to compatible browsers using modern HTML <code><picture></code> tags or Nginx/Apache rewrites.</li>
<li>WP-CLI Power: Built-in commands (<code>wp henkan convert</code>) for sysadmins to process massive libraries directly from the terminal without PHP timeouts.</li>
<li>Global Ready: 100% translation-ready. Shipped with English, German (<code>de_DE</code>), and Japanese (<code>ja</code>) out of the box.</li>
</ul>
<h3>🛠️ System Requirements</h3>
To unleash the full speed of Henkan, we recommend: 
* WordPress: 6.0 or higher 
* PHP: 7.4 or higher 
* For WebP: <code>cwebp</code> installed on the server (recommended) OR PHP <code>GD</code> extension with WebP support. 
* For AVIF: <code>avifenc</code> or <code>ImageMagick</code> (magick/convert) installed OR PHP <code>GD</code> extension with AVIF support.

Henkan – WebP & AVIF Converter

Henkan is a high-performance plugin that automatically converts your media library images to next-generation formats like WebP and AVIF.

ImgHaste

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This WordPress plugin provides integration with our SaaS <a href="https://www.imghaste.com/" title="Image Service" rel="nofollow ugc">Image Service</a> 
By leveraging the Power of <a href="https://www.imghaste.com/blog/client-hints-explained" rel="nofollow ugc">Client Hints</a>.
We’ve chosen to integrate to WordPress via a Service Worker in order to provide best possible compatibility against 
Caching plugins (e.g. W3TC, WPSuper Cache, Elementor…) as well as images coming from your CSS files.
This way you won’t have to rewrite your URLS and lose your images SEO juice.
Nor you will get overcharged in case of a BOT crawl your website.
WHAT DOES THIS PLUGIN DO?
This plugin registers a Service Worker, providing Progressive Web App functionalities to your 
website in order to intercept your Images in order to automatically detect the best possible Image required by your end user.
Since we are speed monkeys, we need to say that the required javascript 
that will load on your page is 708 bytes gzipped. (without a k)
FEATURES OUT OF THE BOX:
<ul>
<li>White Label.</li>
<li>Automatic Integration.</li>
<li>Removes EXIF information.</li>
<li>Compatible with Page Builders.</li>
<li>Effective Connection Type Detection.</li>
<li>Quality drop on slow 3g or Save Data on.</li>
<li>Backup your images for Disaster recovery.</li>
<li>Works with images coming from CSS files.</li>
<li>Search Engines will grab the origin images.</li>
<li>Works with images coming from Ajax requests.</li>
<li>Compatible with Caching / Lazy Load plugins.</li>
<li>Backup your original image safely in the cloud.</li>
<li>Automatic AVIF Conversion based on browser support.</li>
<li>Automatic WebP Conversion based on browser support.</li>
<li>Progressive JPEGs & Interlaced PNGs as Net Gen fallback.</li>
</ul>
FULLY WHITE-LABEL
One of the reasons we decided to go with this approach is no other than SEO. 
Using Client Hints Combined with Service Worker will get you all the performance benefits 
for your end users without the SEO disadvantages that comes with the URL Rewrite.
WHY ITS IMPORTANT NOT TO CHANGE IMAGE URLS
In case you rewrite your image urls into something else all 
SEO juice from all image urls goes to the Vendor domain 
even if the urls contain a canonical name, they are still searchable using the vendor url.
PREREQUISITES
<ul>
<li>Your website runs https only</li>
<li>Your website doesn’t have a Service Worker already.</li>
</ul>
IMPORTANT
This plugin is not compatible with other plugins that registers a Service Worker. You’ll need to disable other plugins 
that registers a service worker on your website or use our <a href="https://www.imghaste.com/docs/" rel="nofollow ugc">Custom Integration Guide</a> and lose the white label feature.

AVIF, WebP, Image Optimization, CDN, Service Worker & Client Hints All in One

Speed up your website using cutting edge Image Service. Service Worker, Client Hints, WebP, 100% white labeled. NO URL Rewrite required.

Henkan – WebP & AVIF Converter vs AVIF, WebP, Image Optimization, CDN, Service Worker & Client Hints All in One