Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for presenting alternative translations. In one aspect, a method includes receiving source language text; receiving translated text corresponding to the source language text from a machine translation system; receiving segmentation data for the translated text, wherein the segmentation data includes a first segmentation of the translated text, the first segmentation dividing the translated text into two or more segments; receiving one or more alternative translations for each of the two or more segments; presenting the source text and the translated text to a user in a user interface; and in response to a user selection of a first portion of the translated text, displaying, in the user interface, one or more alternative translations for a first segment to which the first portion of translated text corresponds according to the first segmentation.