How to permanently delete files on mac without any chance of recovery

You can permanently delete files on Mac with Find my Mac remotely.

When a Mac is lost, stolen, or being reassigned, simply deleting files or erasing the device locally isn't always enough to ensure sensitive data is unrecoverable. For Macs with Apple silicon or the T2 Security Chip that are enrolled in Find My, you can use the remote erase feature via iCloud to not only wipe the device but also permanently delete all files by cryptographically destroying the encryption keys that make the data readable, rendering it securely and permanently inaccessible even if the physical storage is removed.

On any computer or mobile device, open a web browser and go to icloud.com/find. Sign in with the same Apple ID used on the lost Mac.

Click "All Devices" at the top of the Find My interface and select the Mac you wish to erase from the list.

With the device selected, click "Erase This Device." You may be prompted to enter a phone number or message that will appear on the Mac after erasure (this is optional, for recovery purposes).

A critical warning will state that erasing will remove all your data and that you cannot track the device afterward. You will also see an option to "Lock this device after it's erased." You must leave this option checked. This activation lock step is key to the permanent deletion, as it ensures the Mac remains linked to your Apple ID and prevents reactivation without your password. 

Click "Erase" to confirm. The command is now queued and will execute the next time the Mac has an active internet connection. This will permanently delete files from mac.

In summary, permanently deleting files via remote erase from iCloud is a powerful security feature for Apple silicon and T2-chip Macs with Find My enabled. The process involves logging into iCloud Find My, selecting the lost device, and sending an erase command that includes an activation lock. This action does not merely overwrite data but instead destroys the unique encryption keys, making all previous data permanently unrecoverable.