To fix a Canon printer showing offline on Mac or Windows, check the printer's power and Wi-Fi connection. Restart the printer and computer. On Windows, set the printer as default and disable “Use Printer Offline” in Settings. On Mac, reset the printing system and re-add the printer. Still need help? https://medium.com/@averynova934/how-do-i-get-my-canon-printer-back-on-wi-fi-cfbcf7329828