Electoral registration in the UK is often critiqued for making it hard for voters to participate in elections. However, without a tool for a systematic, international comparison, we cannot know if the UK’s system is unusually difficult. Using four criteria of difficulty we create an index of difficulty of registration by adapting an American scheme (Jansa et al 2021) and use it to code 62 countries. Subsequently, we find that the UK has a difficult registration process in comparison to other democracies. We also show that even without implementing automatic registration, there are ways to improve the ease of registration.