Rafał Dziewa

<p>DZIEWA Media Converter creates sidecar <code>.avif</code> and <code>.webp</code> files next to your originals (no replacement of JPG/PNG in the Media Library). On the front end it can rewrite <code><img></code> tags to <code><picture></code> so browsers pick AVIF/WebP when available. The plugin is <strong>entirely free to use</strong> — no license fees, no pro version, and no paid add-ons.</p>
<h4>How it works</h4>
<p>The plugin generates additional AVIF and/or WebP files beside every JPEG/PNG you upload. Originals are never touched or replaced — they remain in the Media Library and on disk as a safe fallback. The optional content filter detects <code><img></code> tags in your post content and wraps them in <code><picture></code> so modern browsers download the smaller AVIF/WebP version, while older browsers transparently fall back to JPG/PNG.</p>
<h4>Conversion</h4>
<ul>
<li><strong>AVIF + WebP, AVIF-only or WebP-only</strong> output modes. AVIF requires PHP GD built with AVIF support; the plugin auto-detects this on activation and gracefully falls back to WebP-only when AVIF is unavailable.</li>
<li><strong>Configurable quality</strong> per format (independent AVIF and WebP quality sliders in settings).</li>
<li><strong>Automatic conversion on upload</strong> — new attachments are converted in the background via WP-Cron or Action Scheduler (when available), so the upload screen never blocks.</li>
<li><strong>Intermediate sizes (thumbnails)</strong> are optionally converted too, so every srcset variant has its own AVIF/WebP sidecar.</li>
</ul>
<h4>Existing media</h4>
<ul>
<li><strong>Background queue</strong> processes already-uploaded images in configurable batches (default 20 files per run, range 5–200). You can scope the queue to a single uploads subfolder and/or a date range to avoid scanning the whole library at once.</li>
<li><strong>Bulk action in the Media Library</strong> — select images and run <strong>Convert to AVIF/WebP</strong> from the bulk menu.</li>
<li><strong>Per-attachment button</strong> — Media Library list, attachment edit screen and media modal each show a <strong>Convert to AVIF/WebP</strong> button next to live savings stats (before/after size, percentage saved per format).</li>
</ul>
<h4>Front end (content rewriting)</h4>
<ul>
<li>Optional <code><picture></code> rewrite in <code>the_content</code> and post thumbnails — browsers automatically pick the lightest format they support.</li>
<li>Lookup of attachment IDs from URLs is cached in the WordPress object cache (Redis/Memcached when available) and memoised per request, so heavy pages with many images stay fast.</li>
</ul>
<h4>Tools & admin UI</h4>
<ul>
<li><strong>Cleanup tool</strong> — remove old generated <code>.avif</code> / <code>.webp</code> sidecars by age (30/60/90/120 days) and folder scope, with a per-folder picker.</li>
<li><strong>Admin bar download</strong> — optional link on singular posts/pages to download the original JPG/PNG of the featured image (useful for social platforms that don’t accept AVIF/WebP).</li>
<li><strong>Event log</strong> — last 100 events (errors, conversions, queue runs) visible on the settings page.</li>
<li><strong>Three-option uninstall dialog</strong> — when removing the plugin you choose between <em>Cancel</em>, <em>Remove (keep generated files)</em> or <em>Remove and delete files</em>.</li>
</ul>
<h4>Privacy & dependencies</h4>
<ul>
<li>No external services, no remote calls, no tracking. Everything runs on your own server.</li>
<li>Requires PHP 8.3+ and PHP GD with WebP support (<code>imagewebp</code>). AVIF is optional.</li>
<li>Fully translated to Polish; English source strings ready for further translations via GlotPress.</li>
</ul>


DZIEWA Media Converter — AVIF + WebP

Converts JPEG/PNG to AVIF and WebP; rewrites content to <picture> with JPG/PNG fallback. Completely free, no paid version.

Nitin Singh

<p><strong>Image Ninja – Convert Images to WebP & AVIF on Upload</strong> is a lightweight WordPress plugin that automatically converts JPEG and PNG images to modern WebP and AVIF formats upon upload. The plugin improves website performance by optimizing image file sizes without compromising quality, leading to faster page loading times.</p>
<h3>Key Features</h3>
<ul>
<li>Automatically converts JPEG and PNG images to WebP and AVIF formats during upload.</li>
<li>Allows configuration of WebP and AVIF image quality in the settings.</li>
<li>Enhances website performance by reducing image file sizes.</li>
<li>Simple settings interface under <code>Settings > Media</code> for easy customization.</li>
<li>Lightweight and developer-friendly codebase.</li>
</ul>
<p>This plugin is ideal for website owners looking to improve load times and optimize image delivery, especially on mobile devices and slow connections.</p>
<h3>Why WebP?</h3>
<p>WebP is a modern image format developed by Google that provides both lossy and lossless compression for images on the web. Here are some benefits of using WebP:</p>
<ul>
<li><strong>Smaller File Size</strong>: WebP images can be up to 30% smaller than JPEGs and PNGs with no noticeable loss in quality, resulting in faster page load times.</li>
<li><strong>Transparency and Animation</strong>: WebP supports transparent backgrounds like PNG and animated images like GIF, making it a versatile choice.</li>
<li><strong>Improved Compression</strong>: WebP offers better compression algorithms compared to traditional formats, allowing for high-quality images with lower storage requirements.</li>
</ul>
<h3>Why AVIF?</h3>
<p>AVIF (AV1 Image File Format) is a cutting-edge image format derived from the AV1 video codec, offering even better compression than WebP. Here’s why AVIF is beneficial:</p>
<ul>
<li><strong>High Compression Efficiency</strong>: AVIF can reduce image sizes by up to 50% compared to JPEG, while maintaining similar or even higher visual quality.</li>
<li><strong>HDR Support</strong>: AVIF supports High Dynamic Range (HDR), allowing for more vibrant and detailed images, especially on modern displays.</li>
<li><strong>Advanced Features</strong>: It includes support for transparency, animation, and a wider color gamut, making it suitable for various types of web content.</li>
</ul>
<h3>License</h3>
<p>This plugin is licensed under the GPLv2 or later license.</p>


Image Ninja – Convert Images to WebP & AVIF on Upload

Automatically convert JPEG and PNG images to WebP and AVIF formats during upload to optimize your WordPress site’s performance.

DZIEWA Media Converter — AVIF + WebP vs Image Ninja – Convert Images to WebP & AVIF on Upload