Mass Resizer is a lightweight but powerful plugin for bulk image optimization.\
It resizes large images, converts them to WebP, replaces them across posts/pages, and safely manages media files without risking broken content.
Key Features
Bulk Image Resize\
• Automatically resizes images to a maximum width/height\
• Maintains aspect ratio (no cropping, unless enabled)\
• Skips small images to reduce unnecessary processing
Safe WebP Conversion\
• Converts JPEG/PNG to modern WebP format\
• Inherits original image metadata (alt, caption, description)\
• Creates proper attachment entries with parent relations\
• Preserves titles and SEO attributes
Safe Replace Mode\
• Replaces all occurrences of images in posts and pages\
• Updates featured images as well\
• Multiple registered sizes are replaced (full + intermediate sizes)
Safe Delete Mode\
To prevent content breakage, original images are deleted
only when both conditions are met:
- Replace Old Images = enabled
- Crop = disabled\
If delete was requested in unsafe configuration, the plugin logs a warning and ignores the deletion.
Admin Statistics + Logs\
After each run, the plugin displays a detailed summary:\
• Images cropped\
• Images converted to WebP\
• Pages updated\
• Originals deleted\
• Total completed operations
All warnings (missing files, unsupported types, editor errors) are logged and shown to the administrator.
Automatic Server Capability Detection\
The plugin checks whether your server supports:\
• JPEG editing\
• WebP conversion
Unsupported features are automatically disabled with an explanation.
Fully Internationalized (i18n)\
All dynamic strings include translator comments, following
WordPress.org standards.