How to Generate Custom Image Size in Uploads Folder?

I’ve seen this kind of sites or even worked on it.

You can add custom sizes from your theme’s functions.php file using add_image_size(). This may help you https://developer.wordpress.org/reference/functions/add_image_size/

Based on your requirement I think this would help you too http://www.wpexplorer.com/wordpress-image-crop-sizes/

Feel free to ask any queries.

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