maniu

Very useful WordPress plugin to resize images before they are being uploaded. Just drag and drop big images and don’t worry about your bandwidth or server space usage.
Everything is configured in “Settings” > “Media”.
It is using power of modern browsers to do the job – Chrome and Firefox would use HTML5 method and other browsers – Flash. 
Generally it looks like Chrome is the best for the job (<a href="http://www.plupload.com/" title="plupload.com" rel="nofollow ugc">plupload.com</a>)

Browser Resize Images

Stan Furtovsky

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.
<h3>Key Features</h3>
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: 
1. Replace Old Images = enabled 
2. 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.

Mass Resizer

Mass Resizer allows bulk image resizing, safe WebP conversion, and automatic metadata preservation — improving page speed and optimizing media librari …

Browser Resize Images vs Mass Resizer