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This tool makes mockups. WhatsApp is a trademark of WhatsApp LLC and Meta Platforms, Inc.; this tool is not affiliated with, endorsed by or connected to either, and the wallpaper is drawn in the WhatsApp style rather than being WhatsApp's own artwork. Passing a generated picture off as a real conversation may be unlawful where you are.
The WhatsApp Chat Generator needs JavaScript: the picture is drawn in this browser, so nothing you type has to travel anywhere. With JavaScript switched off there is nothing that could draw it.