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.

akukitadvt

Akukita Image Optimizer & WebP Converter speeds up your WordPress site by automatically compressing every image you upload and creating a modern WebP copy — all done on your own server. Your media is never sent to an external service, so it stays private and you are never rate-limited or charged per image.
On top of optimisation, it does two things most image plugins don’t: it finds unused images sitting in your media library, and it catches uploads from form plugins (Gravity Forms, WPForms, Formidable) that normally bypass WordPress and never get optimised.
<h4>Why this plugin?</h4>
Large images are the number one cause of slow WordPress sites, and over time the media library fills up with images nobody uses any more. This plugin tackles both: it optimises new uploads the moment they arrive, and it shows you the clutter you can safely review and clean up.
<h4>Free features</h4>
<ul>
<li>Find unused images — scans your media library for images not referenced anywhere and lists them with their wasted disk space, so you can review what to remove. Detection is conservative and review-only; nothing is ever deleted automatically.</li>
<li>Form-plugin integrations — automatically optimises images uploaded through Gravity Forms, WPForms and Formidable Forms, which normally bypass the WordPress media flow and never get compressed.</li>
<li>Scan Uploads folder — finds JPEG/PNG images that exist on disk but were never optimised (placed there by migrations, FTP, or other plugins), and lets you optimise them all in one click.</li>
<li>Automatic compression on upload for JPEG and PNG, at a quality level you control.</li>
<li>WebP conversion — a <code>.webp</code> copy is generated for each image and its thumbnails.</li>
<li>Automatic WebP delivery — visitors whose browsers support WebP are served the smaller file automatically; everyone else gets the original.</li>
<li>EXIF / GPS metadata stripping for smaller files and better privacy.</li>
<li>100% local processing using your server’s Imagick or GD library. No accounts, no API keys, no per-image limits.</li>
<li>Savings dashboard showing how many images were optimised and how much space you saved.</li>
<li>Translation ready and fully internationalised.</li>
</ul>
<h4>Premium features</h4>
A separate Premium add-on unlocks:
<ul>
<li>Safe bulk deletion of unused images, with a backup so you can undo.</li>
<li>Bulk optimisation of your entire existing media library, processed in the background.</li>
<li>AVIF conversion for even smaller files than WebP.</li>
<li>Scheduled re-optimisation and per-folder rules.</li>
<li>One-click restore of original files.</li>
<li>Priority email support.</li>
</ul>
Premium is optional. The free plugin is fully functional on its own.
<h4>Privacy</h4>
This plugin does not send your images, or any personal data, to any external server. All optimisation happens on your hosting. It does not phone home and sets no cookies.

Akukita Image Optimizer & WebP Converter

Compress images, convert them to WebP, find unused images, and even optimise pictures uploaded through form plugins like Gravity Forms — all locally,  …

Codcy Image Optimizer vs Akukita Image Optimizer & WebP Converter