If your HP printer shows offline on Windows or Mac, first check the printer’s power and Wi-Fi connection. Restart the printer, computer, and router. On Windows, go to Control Panel and set the printer as default, ensuring “Use Printer Offline” is unchecked. On Mac, reset the printing system and re-add the printer. Updating or reinstalling drivers can also resolve the issue. https://sites.google.com/view/my-hp-printer-back-online/home