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.

Techbysh

WebPressor is the fastest and most powerful WordPress image optimizer plugin for converting your existing JPEG and PNG media to next-generation WebP and AVIF formats — the two formats recommended by Google for achieving perfect Core Web Vitals and PageSpeed Insights scores.
WebP images are typically 25–35% smaller than JPEG at the same quality. AVIF goes even further — delivering files up to 50% smaller than JPEG and 20% smaller than WebP. By serving these formats automatically to supported browsers, your site loads dramatically faster with zero manual effort.
Version 2.0.0 is a major release introducing AVIF support, a redesigned dashboard, live optimization logs, server-level rewrite rules, system diagnostics, and much more.
<h3>🚀 Why Image Optimization Matters</h3>
Google’s Core Web Vitals (LCP, FID, CLS) are directly impacted by image delivery performance. Large, unoptimized images are the #1 cause of slow page loads and poor PageSpeed Insights scores. WebPressor solves this automatically by:
<ul>
<li>Replacing heavy JPEG/PNG files with lightweight next-gen formats</li>
<li>Serving the smallest possible format each browser supports</li>
<li>Reducing total page weight by up to 50% with zero quality loss</li>
<li>Helping your site pass Google’s “Serve images in next-gen formats” audit</li>
</ul>
<h3>✨ Core Features</h3>
🔹 WebP Conversion — Automatically convert all JPEG and PNG images to WebP format with GD library 
🔹 AVIF Conversion (New in 2.0) — Generate AVIF images for the smallest possible file sizes (PHP 8.1+ with GD AVIF support required) 
🔹 Bulk Optimizer — Process your entire Media Library in batches with a real-time live console log 
🔹 Auto-Convert on Upload — Instantly convert new images as they are added to the Media Library 
🔹 Smart Browser Detection — Serve AVIF to AVIF-capable browsers, WebP to WebP browsers, and original images to legacy browsers 
🔹 Two Delivery Methods — Choose between HTML URL replacement or server-level <code>.htaccess</code> rewrite rules 
🔹 Adjustable Quality Sliders — Independent WebP quality (0–100) and AVIF quality (0–100) controls 
🔹 Lossy & Lossless Modes — Select compression mode for each format 
🔹 Storage Savings Dashboard — See exactly how many megabytes and what percentage you have saved 
🔹 System Status Panel — Checks GD extension, WebP/AVIF availability, folder write permissions, and server type 
🔹 Nginx Configuration Helper — Displays a copyable Nginx server block for manual rewrite rule setup 
🔹 Non-Destructive — Your original JPEG/PNG images are always preserved and never overwritten 
🔹 Compatible With All Themes — Works with Elementor, Divi, Avada, GeneratePress, Astra, Kadence, OceanWP, and more 
🔹 WooCommerce Ready — Optimizes product images, gallery thumbnails, and all image sizes automatically 
🔹 Multisite Compatible — Works on WordPress Multisite installations 
🔹 Translation Ready — Fully localized with <code>.pot</code> file included
<h3>📊 Performance Impact</h3>
 Format 
 Savings vs JPEG 
 Browser Support
 WebP 
 25–35% smaller 
 97%+ of browsers
 AVIF 
 40–50% smaller 
 80%+ of modern browsers
<h3>🛠️ How It Works</h3>
<ol>
<li>Install & activate WebPressor from the WordPress dashboard</li>
<li>Go to the WebPressor → Dashboard in the admin menu</li>
<li>Click Start Optimization to bulk-convert your existing Media Library</li>
<li>Watch the live console log as images are processed in real-time</li>
<li>Monitor your Storage Saved — the dashboard shows total bytes and percentage saved</li>
<li>New uploads are automatically converted in the background (if enabled in Settings)</li>
</ol>
<h3>⚙️ Delivery Methods</h3>
HTML Alteration (Default): 
WebPressor replaces image <code>src</code> URLs in page HTML on-the-fly. Safe, requires no server configuration, and works on any shared hosting.
Server Rewrite Rules (.htaccess): 
For Apache and LiteSpeed servers, WebPressor writes redirect rules directly into <code>/wp-content/uploads/.htaccess</code>. Requests for <code>.jpg</code> and <code>.png</code> files are transparently redirected to their <code>.webp</code> or <code>.avif</code> equivalents — this also handles background CSS images, slider images, and images loaded via JavaScript.
<h3>🔗 Useful Links</h3>
🔹 <a href="https://tbsplugins.com/webpressor-docs/" rel="nofollow ugc">Documentation</a> 
🔹 <a href="https://wordpress.org/support/plugin/tbs-webpressor/#new-topic-0" rel="ugc">Support Forum</a> 
🔹 <a href="https://github.com/TechbyshOrg/tbs-webpressor" rel="nofollow ugc">GitHub Repository</a>
<h3>Source Code & Build Instructions</h3>
This plugin’s JavaScript/CSS assets are minified for production. The original React source code and build tools are available publicly on GitHub.
Repository: 
https://github.com/TechbyshOrg/tbs-webpressor.git
How to build: 
1. Clone the repo: <code>git clone https://github.com/TechbyshOrg/tbs-webpressor.git</code> 
2. Enter the React admin folder: <code>cd react-admin</code> 
3. Install dependencies: <code>npm install</code> 
4. Build production assets: <code>npm run build</code>
<h3>Requirements</h3>
<ul>
<li>WordPress 6.0 or higher</li>
<li>PHP 7.4 or higher (PHP 8.1+ recommended for AVIF support)</li>
<li>GD library with WebP support enabled</li>
<li>GD library with AVIF support (optional, for AVIF conversion)</li>
</ul>

WebPressor – WebP & AVIF Image Converter, Optimizer & Compressor

Convert JPEG & PNG images to WebP and AVIF. Serve next-gen formats automatically. Reduce image sizes up to 50% for a faster, higher-scoring website.

DZIEWA Media Converter — AVIF + WebP vs WebPressor – WebP & AVIF Image Converter, Optimizer & Compressor