Your HP printer shows offline status usually when it can't communicate with your device or PC. Other causes of the printer offline issue include outdated drivers and settings errors. You can try fixing the offline error by updating your printer driver. Also, check your USB cable connection to ensure there is no connection error. Furthermore, verify that you have not enabled the Use Printer Offline mode. If your HP printer is still showing offline status, manually set the default printer and check if it worked. Hopefully, you got the answer to your 'why is my HP printer offline' question.