Maud 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.

Jahidul

IMJOLWP Image Optimizer is a lightweight and performance-focused WordPress plugin that automatically converts uploaded images (JPEG, PNG, GIF) into WebP format while maintaining the original image file names and URLs. This ensures full compatibility across your theme and plugins, while significantly improving your site’s load time and performance.
Key Benefits:
<ul>
<li>Faster website load times due to smaller image file sizes.</li>
<li>No changes to image URLs—maintains backward compatibility.</li>
<li>Server-side conversion using either Imagick or GD, depending on availability.</li>
<li>Easy-to-use settings panel for WebP quality and metadata stripping.</li>
<li>Ideal for blogs, eCommerce, portfolios, and image-heavy sites.</li>
</ul>
Features:
<ul>
<li>🔄 Automatic conversion of JPEG, PNG, and GIF files to WebP upon upload</li>
<li>⚙️ Customizable WebP image quality (0–100)</li>
<li>✂️ Option to remove image metadata for further compression</li>
<li>🧠 Seamless URL preservation (images retain their original URLs)</li>
<li>🔄 Fallback mechanism between Imagick and GD image libraries</li>
</ul>

IMJOLWP Image Optimizer

IMJOLWP Image Optimizer automatically converts uploaded images (JPG, PNG, GIF) to WebP format without changing the original image URL, improving page  …

Simple WebP vs IMJOLWP Image Optimizer