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.

Raffael Jesche

Automatically optimize uploaded images (jpg, png, gif, webp, svg, avif) using the <a href="https://github.com/spatie/image-optimizer" rel="nofollow ugc">Spatie image-optimizer library</a> and binary files on your host system.
New uploaded images with all image sizes (thumbnails) will be optimized automatically.
Previously uploaded images can be updated in two ways:
<ol>
<li>Use the command line interface (cli) and run <code>wp media regenerate</code>, which also triggers the optimization chain. If you don’t have cli access, some other plugin, that regenerates existing thumbnails should work, too (not tested, yet).</li>
<li>The media library has a new column “File size” in the list view, which displays the new and the old file size. If an image is not optimized, there is a link named “Optimize” to run the optimizer directly.</li>
</ol>
Warning: Images are replaced with the optimized ones. Create a backup before testing this plugin. If this is a deal-breaker for you, don’t use it.
Important: If the needed binary files aren’t installed, this plugin won’t optimize anything. Don’t use it, if you don’t know, how to install them or if your web hoster doesn’t provide them.
Notice: WordPress has no support for SVG files. Technically this plugin can optimize them, but I didn’t run any tests with plugins, that add SVG support to WordPress. I was able to optimize svg files automatically in a local test setup (see <a href="https://codeberg.org/raffaelj/wordpress-another-simple-image-optimizer/src/branch/main/tests/prepare-and-run-tests.sh" rel="nofollow ugc"><code>prepare-and-run-tests.sh</code> in the tests folder</a> and search for <code>enable_svg_avif_upload</code>).
For more information and notes about development, checkout the <a href="https://codeberg.org/raffaelj/wordpress-another-simple-image-optimizer/src/branch/main/README.md" rel="nofollow ugc">project README.md file on Codeberg</a>
<h3>Requirements</h3>
<ul>
<li>PHP function <code>proc_open</code> must be enabled (some web hosts disable it via <code>php.ini</code>)</li>
</ul>
<h3>Settings</h3>
Quality settings can be adjusted with constants in <code>wp-config.php</code>:
Set quality for resizing images (GD/Imagick)
<ul>
<li><code>define('ASIO_RESIZE_QUALITY_JPEG', 100); // default: 82</code></li>
<li><code>define('ASIO_RESIZE_QUALITY_WEBP', 100); // default: 86</code></li>
</ul>
Set quality of optimizers
<ul>
<li><code>define('ASIO_QUALITY_JPEGOPTIM', 90); // default: 85</code></li>
<li><code>define('ASIO_QUALITY_PNGQUANT', 90); // default: 85</code></li>
<li><code>define('ASIO_QUALITY_CWEBP', 85); // default: 90</code></li>
<li><code>define('ASIO_QUALITY_AVIFENC', 70); // default: 63</code></li>
</ul>
<h3>Optimization tools</h3>
Spatie image-optimizer will use these optimizers if they are present on your system:
<ul>
<li><a href="https://github.com/tjko/jpegoptim" rel="nofollow ugc">JpegOptim</a></li>
<li><a href="http://optipng.sourceforge.net/" rel="nofollow ugc">Optipng</a></li>
<li><a href="https://pngquant.org/" rel="nofollow ugc">Pngquant 2</a></li>
<li><a href="https://github.com/svg/svgo" rel="nofollow ugc">SVGO 1</a></li>
<li><a href="http://www.lcdf.org/gifsicle/" rel="nofollow ugc">Gifsicle</a></li>
<li><a href="https://developers.google.com/speed/webp/docs/precompiled" rel="nofollow ugc">cwebp</a></li>
<li><a href="https://github.com/AOMediaCodec/libavif/blob/main/doc/avifenc.1.md" rel="nofollow ugc">avifenc</a></li>
</ul>
At least jpegoptim and optipng should be installed.
You can find information about how to install the binary files in the <a href="https://github.com/spatie/image-optimizer#optimization-tools" rel="nofollow ugc">Spatie image-optimizer README.md file</a>.

Another simple image optimizer

Automatically optimize uploaded images using the Spatie image-optimizer library and binary files on your host system (e. g. jpegoptim, optipng)

WebPressor – WebP & AVIF Image Converter, Optimizer & Compressor vs Another simple image optimizer