Images Don't Resize

Regenerate Thumbnails
If you already uploaded images to media library, make sure you regenerate thumbnails by following these steps.​
Low Server Resources
Resizing and trimming are resource-intensive tasks especially when processed images are large, make sure:
In the plugin settings (under WooCommerce menu → Smart Image Resize), select only sizes prefixed by woocommerce_  in the Sizes option.
You increase server memory_limit to at least 512M. (Recommended 1024M )
Purge Cache
Make sure you:
clear your browser cache
purge any caching plugin if present 
purge CloudFlare cache if present
Uploading Images Through WP REST API [Advanced]
Images uploaded trough WP REST API using the route /wp/v2/media  are not resized by default. To enable it:
Add this code snippet to your theme functions.php:
add_filter('wp_sir_process_media_library_upload', '__return_true');
or add this boolean parameter in your request _processable_image 
Uploading Images Through WC Vendors Plugin
By default, images uploaded trough the frontend are not resized, to enable it, add this code snippet to your theme functions.php:
add_filter('wp_sir_process_frontend_upload', '__return_true');
None of The Above Works
No worries! We're here to help, send us your support request at [email protected] and we'll make to get it sorted.

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Enable ImageMagick extension in cPanel

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Regenerate Thumbnails

Low Server Resources

Purge Cache

Uploading Images Through WP REST API [Advanced]

Uploading Images Through WC Vendors Plugin

None of The Above Works