Official web portals are an important component of the background information of the cancer screening programmes. They provide up-to-date and relevant information for health care professionals, the general public and those interested in preventive examinations. They also serve as an official medium for publication of individual programme outcomes. The Czech national screening programmes are presented at the following websites: www.mamo.cz (breast cancer screening), www.kolorektum.cz (colorectal cancer screening), and www.cervix.cz (cervical cancer screening).