So, what should you do when the warning 'Brother Printer offline' displays and you are unable to print a document? The notification 'Brother Printer offline' refers to a printer that is unable to communicate with Windows or Mac operating systems. As a first step in resolving the problem, verify that the power cord, printer connection, and Wi-Fi are all correctly connected. To resolve printer offline difficulties, check the printer driver and software to ensure that no further scanning issues emerge as a result of this.