We experimentally study the eect of the mode of digital communication on the emergence of trust in a principal-agent relationship. We consider three modes of communication that dier in the capacity to transmit nonverbal content: plain text, audio, and video. Communication is pre-play, one-way, and unrestricted, but its verbal content is homogenized across treatments. Overall, both audio and video messages have a positive (and similar) eect on trust as compared to plain text; however, the magnitude of these eects depends on the verbal content of agent's message (promise to act trustworthily vs. no such promise). In all conditions, we observe a positive eect of the agent's promise on the principal's trust. We also report that trust in female principals is sensitive to the availability of nonverbal cues about their partners.