When your HP printer is saying the offline error, it means your printer is not connected properly on your device. There could be different issues, here you can follow the tips to fix the HP printer offline to online
1. Go to the control panel and click on the printers, select the printer model and right-click or tab on printer online option.
2. Then, you have to cancel all the print commands.
3. And one of the reasons behind your printer showing offline error, your drivers are not working properly.
4. You can uninstall your driver and then restart your computer to make changes to your device.
If you are not able to solve the problem, so you can read the blog tips - https://getassist.net/how-to-get-hp-prin...m-offline-to-online/