Methods, systems, apparatus, including computer program products for browsing and editing input for an input method editor. In one implementation, a method is provided. The method includes receiving an input sequence of characters in a first writing system; identifying in the input sequence of characters one or more first subsequences of consecutive characters, where each subsequence represents a syllable in a different, second writing system; identifying in the input sequence of characters one or more second subsequences, where each second subsequence includes one or more consecutive first subsequences and represents a term in the different, second writing system; determining one or more boundaries that delimit the one or more second subsequences; and generating one or more selectable indicators for display in a user interface, where each of the one or more selectable indicators identifies a respective second subsequence delimited by the one or more boundaries.