Canon printer is one of the main brand in printer class and generally used at houses and small offices. Occasionally users face hassle wherein canon printer maintain displaying offline but smooth & simple answers are available to cast off this error. so in case your canon pixma mg6821 offline then follow the instructions given in this manual.
Why Canon PIXMA MG6821 Offline? What are the steps to bring it back online?
Below are the Quickest Steps: