Byteslim Image Optimizer makes your site faster by compressing images and serving next-generation formats — without changing how you work. New uploads are optimized automatically, and you can process your whole library in a few clicks.
Built for performance: it prefers Imagick, falls back to GD when the host restricts it, only overwrites a file when the result is genuinely smaller, and processes large libraries in memory-efficient batches that resume if interrupted.
WebP the way you want it
Choose how WebP is delivered in Settings:
- Replace (recommended) — the media file itself becomes WebP, so your Media Library shows
.webp. The original JPG/PNG is kept and can be restored in one click. - Serve alongside — the original file is never changed; WebP is delivered on the front end via a
<picture>tag with automatic fallback.
Free features
- JPEG & PNG compression (lossless PNG, transparency preserved)
- Adjustable quality, metadata stripping, progressive JPEG
- Optimize the full image and every thumbnail size
- WebP conversion with Replace or serve-alongside delivery
- One-click “Restore original” for any WebP-replaced image
- Bulk optimizer with a progress bar that resumes after interruption
- Media Library “Optimize” action, bulk actions and status column
- Statistics dashboard (images optimized, space saved, compression ratio, health)
- Server status: server, PHP, WebP/AVIF and host/CDN detection
- Activity & error logs
- WP-CLI commands and a read-only REST API
- Translation ready
Premium features
Byteslim Image Optimizer Premium adds automatic scaling of oversized images (resize huge originals down to a maximum you choose, thumbnails rebuilt, original kept restorable), lazy loading with blur-up placeholders and Largest Contentful Paint protection, server-level WebP/AVIF delivery across the whole site (theme and CSS-background images, via .htaccess or an Nginx snippet), AI-generated alt text for accessibility and SEO (bring your own key), media cleanup (find duplicate images and broken records to reclaim space), AVIF conversion, backup & one-click restore of originals, background queue processing, scheduled optimization, WooCommerce/Elementor/Gutenberg/page-builder delivery, advanced analytics and an image health report, and a REST write API.
Premium is available as a low yearly price or a one-time lifetime licence (1, 5 or unlimited sites) — unlimited images, no per-image credits and no bandwidth limits, because it all runs on your own server. Full feature comparison, documentation and licensing: wpdeveloperhub.com/byteslim-image-optimizer
This free plugin makes no external service calls.
Screenshots
Dashboard — images optimized, disk space saved and compression ratio, with coverage meters and an image-health summary.
Settings — compression quality, WebP mode (Replace in the Media Library, or serve alongside via a picture tag) and delivery options.
Bulk Optimize — process your entire Media Library with a live progress bar that resumes if you close the tab.
Media Library — per-image "Optimize" action, an Optimization status column and multi-select bulk actions.
A WebP-replaced image in the Media Library, showing the kept "Original image" and the one-click "Restore original" action.
Server Status — WebP/AVIF support, PHP, memory and web-server/CDN detection.
Logs — a clear activity and error log for every optimization.