This article explains how to remotely erase your iPad using a Mac, PC, or iOS device. You'll need to have Find My iPad turned on before you can remotely erase your iPad. Go to Settings and tap your name at the top, then go to iCloud > Find My iPad and tap the switch to turn it on.
How to Erase Your iPad Before Selling It – Factory Reset / Restore Your iPad
To erase your iPad on a Mac or Windows PC:
Go to www.icloud.com in a web browser and sign in with your Apple ID and password.
Re-enter your password if the site requires you to log in.
