Is it possible to use Cloudinary to get dimensions of any remote image by its URL?

You can use Cloudinary to get image metadata including dimensions for every remote image by its URL, even if the image is not yet stored in Cloudinary. To do that use Cloudinary's explicit API with image type fetch, the image URL as the public ID and image_metadata set to true. Cloudinary will fetch the image, extract the metadata and return it in the response.

You should note that the image will be uploaded to your Cloudinary account in case the request was successful.