Swiss representations abroad can neither issue certified copies nor attest diplomas obtained in Switzerland. You must therefore contact the school or university where you did your studies to obtain the necessary copies.
The recognition of Swiss diplomas abroad is the responsibility of the host country. However, the competent authorities in Switzerland may, upon request, issue a certificate for the authority of the country concerned. The following authorities can assist you in obtaining the necessary certificates:
For training at the federal level : State Secretariat for Education, Research and Innovation SERI
For university diplomas: Swissuniversities
For cantonal certificates and diplomas: Swiss Conference of Cantonal Ministers of Education EDK (information available in FR/DE/IT)