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If your Canon printer showing offline mac, it could be due to connectivity issues, outdated drivers, or incorrect settings. To fix it, ensure the printer is powered on, connected to the same Wi-Fi network, and that drivers are up-to-date. Resetting the printing system may also help.
Website - https://www.canonprintersupportpro.us/blog/how-to-get-canon-printer-online-on-mac/