Rafał Dziewa

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 entirely free to use — no license fees, no pro version, and no paid add-ons.
<h4>How it works</h4>
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.
<h4>Conversion</h4>
<ul>
<li>AVIF + WebP, AVIF-only or WebP-only 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>Configurable quality per format (independent AVIF and WebP quality sliders in settings).</li>
<li>Automatic conversion on upload — new attachments are converted in the background via WP-Cron or Action Scheduler (when available), so the upload screen never blocks.</li>
<li>Intermediate sizes (thumbnails) are optionally converted too, so every srcset variant has its own AVIF/WebP sidecar.</li>
</ul>
<h4>Existing media</h4>
<ul>
<li>Background queue 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>Bulk action in the Media Library — select images and run Convert to AVIF/WebP from the bulk menu.</li>
<li>Per-attachment button — Media Library list, attachment edit screen and media modal each show a Convert to AVIF/WebP 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>Cleanup tool — 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>Admin bar download — 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>Event log — last 100 events (errors, conversions, queue runs) visible on the settings page.</li>
<li>Three-option uninstall dialog — when removing the plugin you choose between Cancel, Remove (keep generated files) or Remove and delete files.</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.

ThemeDot

Sadat Himel

Image Format Converter is a powerful, lightweight administrative tool that allows you to easily convert images in your WordPress Media Library to modern formats like WebP and AVIF, as well as standard PNG and JPG formats.
By leveraging your server’s native PHP image processing libraries (GD or Imagick), this plugin converts images with high quality and optimal compression. With the newly added AJAX-powered engine, you can now select and convert multiple images at once, watch their progress in real-time with an animated progress bar, and see exactly how many kilobytes and storage percentage you saved.
Features: 
* AJAX Bulk Conversion: Select multiple images from the Media Library and convert them sequentially. Prevents script timeouts on large libraries. 
* Proportional Resizing: Set optional maximum width or height constraints to scale down high-resolution images during conversion. 
* Media Library Row Action: Convert images directly from the Media Library list view (<code>upload.php</code>) with a quick “Convert Format” link. 
* Size Savings Calculator: Shows original size, converted size, and total storage savings in real-time. 
* Metadata Control (EXIF Stripping): Clean up extra file space by stripping camera EXIF profiles and color data when using Imagick. 
* Auto-Delete Original: Clean up your server automatically by deleting the original image file and database attachment after a successful conversion. 
* Flexible settings: Configure JPEG quality, PNG compression levels, WebP/AVIF quality, and toggle Media Library registration. 
* Server Diagnostics: View library status (GD, Imagick, WebP, AVIF) at a glance, with step-by-step instructions to enable missing libraries.
Access all features by going to Media > Image Converter.
<h3>Support the Developer</h3>
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Image Format Converter

Convert images between JPG, PNG, WebP, and AVIF in the WordPress admin with a modern, AJAX-powered UI. Built-in support for bulk conversions, image re …

DZIEWA Media Converter — AVIF + WebP vs Image Format Converter