Anyone know a good file shredder for mac for permanent data deletion?

Boot into macOS Recovery and permanently erase the drive without any file shredder software on your Mac. Here is how to do that:

1. After turning off your phone, press the power button to turn it on and immediately press and hold the Command (⌘) + R key combination.

2. When you see the Apple logo or spinning globe (for networked recovery), release the key and wait to enter the Recovery Mode screen.

3. In the Recovery Mode menu, select “Disk Utility” > click on “Continue”.

4. Select the target hard disk in the left sidebar.

5. Click the “Erase” button at the top and set the following parameters, including name, format and partition table.

6. Click “Security Options” and drag the slider to select the number of overwrites. 3~7 overwrites is the safest and most compliant with security standards for sensitive data.

7. Return to the Recovery Mode main menu and select “Reinstall macOS”.

8. Follow the prompts to install a pristine system with using any file shredder app for Mac. When finished, your Mac will enter the initialization screen, at which point it can be securely transferred to the buyer.

Notes

Time Cost: Securely erasing a 500GB SSD takes approximately 1 to 3 hours (7 overwrites may take longer).

Encrypt the drive: If FileVault is enabled, direct formatting is sufficient (data cannot be decrypted after key destruction).

T2 Chip/Apple Silicon: These models have built-in encryption and do not need to be overwritten multiple times after erasure (key destruction invalidates the data).