Freemius

Harv

Harvify Image Optimizer helps WordPress administrators convert Media Library images to modern WebP and AVIF formats without running heavy compression work inside PHP.
The plugin scans lightweight attachment metadata first, then your browser converts selected images in a small queue. Images are processed with Web Workers and OffscreenCanvas where available, uploaded back through authenticated WordPress REST API requests, and released from browser memory as each item finishes.
This client-side approach is designed for shared hosting environments where PHP memory limits and execution timeouts can interrupt large image optimization jobs.
<h4>Key features</h4>
<ul>
<li>Convert JPEG, PNG, WebP, and AVIF source images to WebP or AVIF.</li>
<li>Scan one source format at a time so existing target-format images are not accidentally reprocessed.</li>
<li>Select a few images for a test run before processing the full queue.</li>
<li>Skip small files, very large images, selected upload paths, or filename patterns.</li>
<li>Deliver Pro sidecar variants through PHP picture tags when available.</li>
<li>Adjust quality and queue concurrency from the admin screen.</li>
<li>Save queue state in the browser with IndexedDB so work can resume after interruption.</li>
<li>Keep wp-admin responsive by doing conversion work in browser workers.</li>
<li>Process images locally in your browser without using an external optimization API.</li>
<li>Optional original-file deletion, disabled by default.</li>
</ul>
<h4>Privacy and external services</h4>
Harvify Image Optimizer does not send images to a third-party compression service, load scripts from external CDNs, or track usage. Images are fetched by your browser from your own WordPress site and uploaded back to your own WordPress REST API.
AVIF encoding uses bundled WebAssembly encoder files. The current AVIF path uses the Apache-2.0 licensed @jsquash/avif single-thread encoder, with the earlier bundled wasm-avif encoder retained as a local fallback.
<h4>Format testing</h4>
If you want to experiment with AVIF conversion outside your WordPress Media Library first, you can use this browser-based test tool:
<a href="https://conversores.online/en/avif-to-png-converter/" rel="nofollow ugc">AVIF to PNG Converter</a>

Harvify Image Optimizer for WebP and AVIF

Convert Media Library images to WebP or AVIF locally in your browser.

GrandPlugins

This plugin allows you to easily convert any image type to another, including png, jpg, gif, webp, and avif. With just one click, you can convert your images to any of these formats, and with support for image subsizes, you can ensure that all of your images are optimized for your website.
<h3>More Features in Pro</h3>
👉 <a href="https://grandplugins.com/product/wp-image-converter/?utm_source=free&utm_medium=wp/" rel="nofollow ugc">Pro</a> 👈
<ul>
<li>
Auto Convert – Convert images from any type to another automatically on upload.
</li>
<li>
Bulk Convert – Convert images from any type to another in bulk.
</li>
<li>
Quick Convert – Convert any image from media list.
</li>
<li>
Keep File Extension – Convert images type without breaking embedded images URLs.
</li>
<li>
Quick Optimize – Optimize any image from media list.
</li>
<li>
Auto Optimize – Optimize any image automatically on upload.
</li>
<li>
Bulk Optimize – Optimize all images in on click.
</li>
<li>
Track optimization – Check optimization history of each image in the image edit page.
</li>
</ul>
<h3>Usage</h3>
<pre><code>Head to any image edit page from media menu, You will find the Converter metabox in right side of the page, select the target image type, then hit submit.<h3>Check Our other plugins</h3>
</code></pre>
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Image Converter & Optimizer


eccellent plugin, features in the free version are more than enough for most websites.



ps your site is not responsive






Excellent

Easily convert any image type to another, including png, jpg, gif, webp, and avif in a single click, with support for image subsizes.

Harvify Image Optimizer for WebP and AVIF vs Image Converter & Optimizer