Possible to erase iPhone before selling from a computer?

Elorasver  A factory reset on an iPhone deletes all user data and settings, but the data is not necessarily gone permanently. 

When you perform a factory reset on iPhone, the data is technically deleted from your view and becomes inaccessible through normal use. However, the data might still exist in the device's storage and could potentially be recovered using specialized data recovery tools if it hasn’t been overwritten by new information.

iPhones use encryption, and when you perform a reset, the encryption keys that unlock your data are deleted. Without these keys, it is much more difficult for anyone to recover the deleted data. However, highly skilled professionals with access to advanced recovery technology may still attempt to recover fragments of data.

In short, a factory reset is not enough to permanently wipe an iPhone before selling. You'd better use advanced tool to secure the process a bit further.