Pixellize Image Optimizer
Auto-convert every image you upload to WebP. Smaller files, faster pages, better Core Web Vitals. No paid tier, no setup wizard, just install and forget.
Six things you get out of the box
Every image you add to your Media Library is converted to WebP and wired into your existing posts, pages, and responsive markup.
Automatic on Upload
JPG, JPEG, PNG, BMP, and AVIF files are converted the moment they hit your Media Library. No bulk operations to run, no buttons to click.
URL Replacement Site-Wide
Old image URLs are swapped for the new WebP version inside post content, image tags, and the responsive srcset attribute, so visitors instantly see the lighter file.
Adjustable Quality
Pick a WebP quality between 0 and 100. The default of 85 hits the sweet spot between visual quality and file size for most sites.
Storage Saver
After a successful conversion the original file is removed, freeing disk space. If anything fails, the original stays put so nothing is ever lost.
Safe Fallbacks
Uses the GD library by default, falls back to Imagick if GD is missing, and refuses to activate at all if neither library is available, so you never end up in a broken state.
No Duplicate Work
If a file is already WebP, the plugin leaves it alone. Re-uploads of an already-converted image are skipped, so your server never wastes cycles re-encoding.
Faster pages with no design compromise
WebP files are typically twenty to forty percent smaller than the equivalent JPG or PNG, with the same visual quality. Smaller files mean better scores where they actually count.
Better Core Web Vitals
Smaller hero and gallery images load sooner, lifting your Largest Contentful Paint score and reducing layout jumps caused by slow image loads.
Stronger SEO Signals
Page speed is a confirmed Google ranking factor. Lighter images move you up the rankings without rewriting a single article.
Lower Bandwidth Bills
If you pay for hosting bandwidth or CDN traffic, smaller image files translate directly into a smaller monthly bill. The savings compound on busy sites.
A plugin you can forget about
The best image optimizer is the one you stop thinking about after install. Pixellize Image Optimizer was built for that. There is no daily check-in, no quota meter, no console to monitor. You upload your images the way you have always uploaded them, and the WebP version is in place before the upload screen even closes.
Behind the scenes, every URL on your site is rewritten to point at the new WebP file: image tags in post content, attachment metadata, and the responsive srcset attribute that browsers use to pick the right size. Old links keep working too, so nothing in your back catalogue breaks.
If a conversion ever fails because of an unusual file, the original is left untouched and a clear admin notice tells you what happened. Nothing silently disappears. The result: a quieter Media Library, lighter pages, and one less plugin you need to babysit.
Three steps and you are done
No signup, no API key, no third-party service. Everything happens inside your WordPress install.
Install & activate
Search “Pixellize Image Optimizer” in your Plugins menu, click Install, then Activate. The plugin checks for GD or Imagick before it activates.
Set the quality (optional)
Go to Tools then Pixellize Image Optimizer to adjust WebP quality. The default of 85 works for most sites, so most users skip this step.
Upload as usual
Drop images into your Media Library the way you always do. WebP versions are generated automatically and used everywhere on the site.
Roadmap for upcoming releases
The plugin is actively developed. Here is what is on deck.
Bulk Conversion
A one-click way to convert every existing image already in your Media Library, not just new uploads.
Keep-Originals Option
A toggle to retain the original JPG or PNG alongside the WebP, useful when you need the source files for downloads or re-edits.
Lazy Loading & CDN
Built-in lazy-load support and tighter compatibility with popular CDNs so off-loaded images stay in WebP form too.
Quick answers before you install
Which image formats are supported?
JPG, JPEG, PNG, BMP, and AVIF. GIF is not supported because animated images would lose their frames during conversion.
Will it convert images I already uploaded?
Not in the current version. Right now only new uploads are converted. Bulk conversion for the whole Media Library is on the roadmap.
Is the original image deleted?
Yes, but only after a successful conversion. If anything fails during the conversion the original file stays exactly where it was, so nothing is ever lost.
What if my server does not support GD?
The plugin automatically falls back to Imagick. If neither library is available the plugin refuses to activate and shows a clear admin notice, so you cannot end up in a broken state.
Can I control image quality?
Yes. Quality is adjustable from 0 to 100 with a default of 85. Lower values mean smaller files and slightly lower visual quality.
What happens if I upload a file that is already WebP?
It is skipped entirely. No re-encoding, no duplicate file, and no extra work for your server.
How do I get help or report a bug?
Use the support tab on the WordPress.org plugin page, or email [email protected]. We read every message and reply within one to two business days.
Lighter images in the next minute
Install the plugin from WordPress.org and start serving WebP versions of every new image you upload, automatically.