How to Brother Printer showing offline is amongst the most troubling issues that users come across. It occurs due to the accumulation of too many pending print jobs or incorrect printer settings. To fix it, you can simply visit the Control Panel section, locate the Brother printer in the list, right-click over it and choose the Use printer online option. On the same menu, you must select Set as the default printer. The next step should be restarting the router and reconnecting the printer to the wireless network.