Want to create a great customer experience, but do not want to force your customers to register? There is a solution!
Magento 2 Convert Guest to Customer Extension allows you to convert guest order to customer account in one click. Besides, with this module, you are able to:
- set the conversion process to be automatic
- change order customer
- assign a converted customer to a customer group
- convert all old guest orders to customers
Follow the link in order to learn more about the Magento 2 Convert Guest to Customer Extension
Source by Magento 2 Extensions