Techniques are described for data transformation performed based on a current emotional state of the user who provided input data, the emotional state determined based on biometric data for the user. Sensor(s) may generate biometric data that indicates physiological characteristic(s) of the user, and an emotional state of the user is determined based on the biometric data. Different dictionaries and/or dictionary entries may be used in translation, depending on the emotional state of the sender when the data was input. In some implementations, the emotional state of the sending user may be used to infer or otherwise determine that a translation was incorrect. The input data may be transformed to include information indicating the current emotional state of the sending user when they provided the input data. For example, the output text may be presented in a user interface with an icon and/or other indication of the sender's emotional state.
