Image Sizes Manager | Prosyscom Tech

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• easily add, edit, delete & regenerate all image sizes
• manage built-in, 3rd party and your custom image sizes
• asynchronous, fast, fail-safe image regenerating with a convenient progress bar
• great for complex themes with many image sizes
• full WP admin integration with native WP GUI
• [thumbnail size=”your-image-size” /] shortcode for inserting custom size thumbnails in posts and pages

Online demo, examples and documentation

Source