How do I erase my iPad before selling it?

Before parting with your iPad, whether trading-in or selling privately, ensure that the device is properly prepared:

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Following this procedure will securely erase all data - and remove the Activation Lock that will otherwise prevent re-use by its new owner.

Tap the Settings icon, select General, choose Reset , and tap Erase All Content and Settings.