Current students should request documents via My Imperial and full information/guidance on the process can be found on: https://www.imperial.ac.uk/student-records-and-data/for-current-students/request-an-official-document/ If you have any queries about official documentation please contact the Student Hub.
My Imperial allows you to access your documents, including proof of enrolment and award documentation. You can then digitally share these documents with third parties such as an employer or university.
Alumni official document requests/information can be found here.