HP printer offline error on Windows 10 usually happens after installing the new windows update or due to some other small probabilities. You can take a look at all of the issues and their brief solutions so as to rectify the error. And if nothing seems to give you the desired result, then you must get in touch with HP Printer Support Number immediately.
• Make sure that the connections have been secured properly.
• Update the printer driver software to make it compatible with Windows 10.
• Edit the printer status and change it to ‘Print when offline’.
• You may also restart the printer spooler.