You can use the Admin API to bulk delete all of your Cloudinary uploaded resources in batches of 1000 resources per call.
For example in PHP, to delete all assets of resource type image (default) and type upload (default) you can do this:
You can delete only a certain type of resource, for example - Facebook fetched profile images:
$api->delete_all_resources(array("type" => "facebook"));
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 lists of your resources.
Note that the Admin API is rate limited.
Bulk delete assets in the UI. In addition to bulk deletes via the API, you can execute a bulk deletion jobs by going to your Account's Settings page and click the Bulk delete button from the Support activities section -