Jill Royer

Every time you upload an image, Simple WebP generates a .webp version. It then alter the HTML to replace img tags with picture tags, which let the browser pick the best format.
WebP images are often smaller than original .jpeg or .png one, so can save bandwidth and load time. Most browsers support WebP nowadays. You can use <a href="https://developers.google.com/speed/pagespeed/insights/" rel="nofollow ugc">Google Pagespeed</a> tool to see the gain you would get from WebP.
You will get much faster load time, and better ranking in Google Search.
Simple WebP is very much inspired by the more complete (and complex to install) <a href="https://fr.wordpress.org/plugins/webp-express/" rel="nofollow ugc">WebP Express</a> plugin. It also use the same libraries :
<ul>
<li><a href="https://github.com/rosell-dk/webp-convert" rel="nofollow ugc">WebPConvert</a>: For converting images to webp</li>
<li><a href="https://github.com/rosell-dk/dom-util-for-webp" rel="nofollow ugc">DOM Util for WebP</a>: For the Alter HTML functionality</li>
</ul>

Simple WebP

For every image uploaded, Simple WebP creates a WebP version which is served to compatible browsers.

Freemius

Md Nishath Khandakar

Nish Image Optimizer is a fast and simple WordPress plugin designed to make your website lighter and faster. 
It automatically compresses and converts your images into modern formats like WebP and AVIF, while also supporting JPEG and PNG.
By optimizing images directly inside WordPress, you can dramatically improve page speed, Core Web Vitals, and SEO rankings — without relying on third-party APIs or external services. Nish Image Optimizer runs 100% locally on your server using WordPress’ built-in image libraries (GD/Imagick).
<h3>🚀 Key Features</h3>
<ul>
<li>✅ Automatic Optimization on Upload – new images are optimized instantly. </li>
<li>✅ Bulk Optimization – optimize your entire Media Library with a single click. </li>
<li>✅ Multiple Formats – WebP, AVIF, JPEG, PNG. </li>
<li>✅ Skip Already Optimized Images – saves time and resources. </li>
<li>✅ Minimum File Size Skip – ignore small icons or logos. </li>
<li>✅ Fallback Detection – if AVIF/WebP isn’t supported, it falls back to JPEG/PNG automatically. </li>
<li>✅ WP-CLI Support – for developers who want command-line optimization. </li>
<li>✅ Lightweight & Fast – no external API calls, no credits, no monthly limits. </li>
<li>🔑 Pro Features – per-image re-optimization, advanced PNG → WebP/AVIF handling, and more.</li>
</ul>
<h3>🔑 Why Choose Nish Image Optimizer?</h3>
<ul>
<li>100% free to start with essential optimization features. </li>
<li>Pro upgrade unlocks advanced image handling for power users. </li>
<li>Built for speed, simplicity, and WordPress performance best practices. </li>
</ul>

Nish Image Optimizer

Lightweight WordPress image optimizer. Compress JPEG, PNG, WebP, and AVIF automatically for faster websites.

Simple WebP vs Nish Image Optimizer