Most travellers, including citizens of the EU, Australia, New Zealand, the USA, Canada and South Africa, can enter Macau with just their passports for between 30 and 90 days. Most others can get a 30-day visa on arrival. They cost MOP$100/50/200 per adult/child under 12/family.
If you’re visiting Macau from China and plan to re-enter China you will need to be on a multiple-entry visa. If your visa expires you can obtain a single one-month extension from the Macau Immigration Department (725 488; ground fl, Travessa da Amizade; 9am-12.30pm & 2.30-5pm Mon-Fri).