You can use the interactive Media Library to delete derived resources one by one. This is done by choosing the original image, click on 'View derived images' and delete the derived resource.
In order to bulk delete derived resource, use one of our Admin API delete methods while setting the
keep_original parameter to
true, this ensures that only derived resources are deleted. For example, (in Rails):
Cloudinary::Api.delete_resources(['image1', 'image2'], :keep_original => true)
You can also use the
delete_all_resources method to bulk delete all derived images of your uploaded resources in batches of 1000 resources per call. For example:
Cloudinary::Api.delete_all_resources(:keep_original => true)
You can choose to delete only derived resources of a certain type, for example - Facebook fetched profile images:
Cloudinary::Api.delete_all_resources(:type => :facebook, :keep_original => true)
When there are still more resources to go through, the
next_cursor value is returned as part of the response. You can then specify this value as the
next_cursor parameter of the following call. This way you can go through the full list of your resources.
For more information, see: http://support.cloudinary.com/hc/en-us/articles/205714121-How-do-I-browse-through-all-resources-in-my-account-using-the-API-
Note that the Admin API is rate limited.