What is the character limit per post in IM Chat in Zoom App? July 22, 2022June 28, 2021 by Zoom Help It is 4096 characters (2048 characters for double-byte characters ). If the limit is exceeded, the transmission will be halfway. Q/A Does IM chat data remain as a log? I want to know how to transfer files via IM chat. Is there a way to break a line in chat?