How to Properly Wipe a Mac Before You Sell It

Before a Mac leaves your hands, one job matters more than any other: to properly wipe a Mac before you sell it, so none of your data goes with it and the next owner can set it up as their own. Done right, it takes a few minutes and one screen. Done carelessly, it can leave your files exposed or, worse, hand the buyer a machine that is still tied to your Apple Account and refuses to activate. The good news is that modern Macs make this almost foolproof, provided you follow the steps in the right order.

The tool you want is Erase All Content and Settings. Apple describes it as a way to "quickly and securely erase all of your data, settings, and apps, while maintaining the operating system currently installed," and it is the same one-tap reset that iPhones have had for years. It exists precisely so you do not have to reinstall macOS by hand. There is one catch: it is only available on newer hardware, so the first thing to confirm is which kind of Mac you have.

Step one: back up before you wipe a Mac

Erasing is permanent, so the very first move is a backup. Apple's guidance to anyone preparing a Mac for sale is blunt: back it up first so you can "restore your files later," or transfer what you need to another device. A Time Machine backup to an external drive is the simplest route, and it also gives you a clean way to move everything onto your next machine. Do not skip this step because you think the files are "probably in iCloud" — confirm it, because once the erase runs there is no undo.

While you are at it, deauthorize anything license-bound. If you used the Mac for Apple Music or bought media through it, sign out of those services, and unpair accessories or authorizations you will not be carrying forward. The erase itself will handle account sign-out, but tidying up first avoids surprises.

Step two: use Erase All Content and Settings (Apple Silicon and T2)

According to Apple's support article on preparing a Mac for sale, Erase All Content and Settings requires macOS Monterey 12 or later and either a Mac with Apple silicon or a Mac with the Apple T2 Security Chip. That covers essentially every Mac sold since 2018. To run it, open System Settings → General → Transfer or Reset, then choose Erase All Content and Settings. You will be asked for your Mac login password and your Apple Account password.

Here is the part people trip on: as the process signs you out of Apple services, you may see prompts to sign back in. Ignore them. Apple's own instruction is to click Erase All Content & Settings instead of re-entering credentials. When it finishes, the Mac restarts to the "Hello" setup screen as if it were brand new. For a sale, power it down there rather than completing setup, so the buyer receives it in genuine out-of-box condition.

Step three: older Intel Macs take the long road

If your Mac predates the T2 chip — many models from 2017 and earlier — Erase All Content and Settings will not appear, and you have to erase and reinstall manually. Apple's macOS User Guide walks through it: restart while holding Command-R to enter macOS Recovery, open Disk Utility, select your startup volume and click Erase, choose the APFS format, then erase the volume group. Quit Disk Utility, choose Reinstall macOS, and let it install a fresh copy. Plug a laptop into power first and make sure you have a network connection, because the reinstall pulls the OS from Apple.

This route is slower and involves more steps, but it lands in the same place: an empty machine with a clean operating system and none of your data. Just remember that Recovery erasing does not automatically sign you out of your Apple Account, which is why the next point matters even more on these older Macs.

Why wiping matters beyond your files

Erasing protects your privacy, but there is a second reason it is non-negotiable: Activation Lock. When Find My is on, a Mac is tethered to your Apple Account at a low level, and as Apple explains, that lock is designed to "prevent others from using your Mac if it's lost or stolen." Erase All Content and Settings turns Find My off for you as part of the reset. But if you erase an older Mac only through Recovery without signing out of iCloud first, the machine can arrive at its new owner still locked — and a locked Mac is effectively a paperweight until the original account holder releases it.

So on any Mac, confirm you are signed out of iCloud and that Find My is off before the device ships. On modern hardware the built-in erase handles it. On older Intel Macs, sign out of iCloud in System Settings (or remove the device at iCloud.com) before or after the Recovery wipe. A buyer who powers on the Mac and reaches a fresh setup screen with no lock prompt is the goal.

A quick pre-sale checklist

• Back up to Time Machine or copy files off the Mac.
• Sign out of Apple Music, media, and any licensed apps.
• Erase All Content and Settings if you have Apple silicon or a T2 chip; otherwise erase and reinstall via Recovery.
• Confirm Find My is off and you are signed out of iCloud, so Activation Lock cannot follow the machine.
• Leave it at the setup screen, powered off, so the buyer starts clean.

One thing wiping does not do is change what your Mac is worth. Condition, configuration, and model set the value; a clean install just makes the handoff smooth and trustworthy. If you would rather skip the private-buyer back-and-forth entirely, getting an instant offer takes about thirty seconds, and you can wipe the machine right before it ships out on the prepaid label.

The bottom line

To properly wipe a Mac before you sell it, back up, run Erase All Content and Settings on any Apple silicon or T2 model, and fall back to a Recovery erase-and-reinstall only on older Intel machines. The step that protects both you and the buyer is confirming Find My is off so Activation Lock does not travel with the device. Get those two things right and the rest of the sale is just logistics.