Codcy

Codcy Image Optimizer converts your existing JPEG and PNG images to WebP format in bulk — directly on your server, with no third-party API or paid subscription required.
WebP images are significantly smaller than JPEG and PNG files (typically 60–95% smaller), which leads to faster page loads, lower bandwidth usage, and better Core Web Vitals scores.
How it works:
<ol>
<li>Scan — Analyzes your entire Media Library. Shows total image count, file size, and format breakdown before any changes are made.</li>
<li>Review — You decide when to start. Nothing is changed until you click Start.</li>
<li>Optimize — Converts images in batches of 20. Originals are backed up automatically.</li>
<li>Report — A detailed summary shows converted count, space saved, average compression rate, and any errors.</li>
</ol>
Key features:
<ul>
<li>Converts JPEG and PNG to WebP</li>
<li>Automatic backup of original files to <code>uploads/codcy-image-optimizer/backup/</code></li>
<li>Skips images where WebP would be larger than the original</li>
<li>Fixes EXIF orientation automatically (Imagick)</li>
<li>Resumes from where it left off if interrupted</li>
<li>Does not alter image dimensions or crop ratio</li>
<li>No external API, no account required</li>
<li>Works with Imagick (preferred) or GD Library</li>
</ul>
What it does NOT do (intentionally):
<ul>
<li>Does not resize images</li>
<li>Does not process GIF files (may contain animation)</li>
<li>Does not delete backups automatically</li>
</ul>

Codcy Image Optimizer

Bulk convert JPEG and PNG images to WebP. No external service. Runs entirely on your server with automatic backup.

xdmedia

PuffPix Compress automatically optimizes every image you upload to WordPress — reducing file sizes by 40–80% without visible quality loss. Faster pages, lower bandwidth, better Core Web Vitals scores.
It works by connecting to the <a href="https://puffpix.com" rel="nofollow ugc">PuffPix</a> image compression API. When you upload an image, PuffPix compresses it server-side using industry-leading encoders (mozjpeg, pngquant, cwebp) and returns the optimized file, which replaces the original in your media library.
<h4>Why PuffPix?</h4>
<ul>
<li>No server load — compression happens on PuffPix servers, not yours</li>
<li>Better results than GD — uses mozjpeg and pngquant for noticeably smaller files at the same quality</li>
<li>All thumbnail sizes — automatically compresses every generated thumbnail, not just the original</li>
<li>EXIF stripping — removes GPS coordinates and device metadata for privacy</li>
<li>Bulk optimization — compress your entire existing media library in one click with a live progress log</li>
<li>Per-image stats — see exactly how much each image was reduced, right in the media library</li>
</ul>
<h4>Compression Engines</h4>
<ul>
<li>Standard (GD) — PHP’s built-in image library. Fast and universally compatible. Quality 85 (balanced) or 72 (aggressive).</li>
<li>Pro (mozjpeg + pngquant) — significantly better compression than GD at the same visual quality. JPEGs typically 20–30% smaller than GD output.</li>
<li>Max — maximum compression using the best available encoder per format. Smallest possible file size. Requires Pro or Trial plan.</li>
</ul>
<h4>Supported Formats</h4>
JPEG, PNG, WebP, GIF. SVG support is available on the PuffPix web tool.
<h4>Free Trial</h4>
New users get 100 free compressions over 30 days — no credit card required. Get your key at <a href="https://puffpix.com/trial.php" rel="nofollow ugc">puffpix.com/trial.php</a>.
<h4>How to Get Your API Key</h4>
<ol>
<li>Visit <a href="https://puffpix.com" rel="nofollow ugc">puffpix.com</a></li>
<li>Click Get free trial — no credit card needed</li>
<li>You’ll receive 100 credits by email</li>
<li>Paste the key into Settings → PuffPix Compress</li>
</ol>
<h4>Privacy & External Services</h4>
This plugin sends image data to the PuffPix API for compression. Please see the “External Services” section below for full disclosure.
<h3>External Services</h3>
This plugin connects to the PuffPix image compression API to compress images.
What data is sent: 
* The image file(s) selected for compression 
* Your API key (to authenticate your plan) 
* Compression settings (engine, quality, strip EXIF) 
* Anonymous compression metrics: file format, engine, quality, bits-per-pixel range, and compression ratio (no image content, filename, or personal data)
What happens to your data: 
* Images are processed and the compressed version is returned to your server 
* Images are automatically deleted from PuffPix servers within 30 minutes 
* No image content is stored permanently 
* API keys are not logged beyond authentication
Service details: 
* Service name: PuffPix 
* Service URL: https://puffpix.com 
* API endpoint: https://puffpix.com/api.php 
* Privacy policy: https://puffpix.com/privacy 
* Terms of service: https://puffpix.com/terms
This plugin will not make any API calls unless an API key has been entered in the settings. Images are only sent to the PuffPix API when compression is explicitly triggered (on upload if auto-compress is enabled, or manually via the media library or bulk compress page).

PuffPix Compress

Automatically compress and optimize images on upload. Bulk-optimize your entire media library. Smaller files, faster site — no quality loss.

Codcy Image Optimizer vs PuffPix Compress