Is your canon printer offline? Here’s how you can get it back online in a few simple ways. First of all, you should try to reconnect your printer to the wifi and then see if it is back online or not.
If not, then hold the printer’s wifi switch till the lights start flickering. Once if constantly blinks blue, press the router’s WPS button. If this doesn’t help then you can restart the spooler services.
You should also make sure that the canon printer has been set as default otherwise it might continue to show offline status even though it will be on and perfectly connected.