How to Factory Reset a Mac
Erasing a Mac back to factory condition is genuinely straightforward on recent macOS — but there's one step people skip that causes real headaches later: signing out of your accounts first. Miss it, and the Mac stays locked to you, leaving the next owner unable to use it. Whether you're selling, gifting, recycling or just starting fresh to clear a stubborn problem, here's the safe, complete way to factory reset a Mac.
When a factory reset makes sense
A reset is the right move when you're passing the Mac on, when it's so cluttered or misbehaving that a clean slate is easier than chasing the fault, or after a malware scare you want to be completely sure is gone. It's worth saying it's a big hammer, though — for a simple slow-down, a tidy-up and an upgrade often do the job without wiping everything (see our guide to a slow MacBook). If you've decided a reset is what you want, read on.
1. Back up with Time Machine
A reset erases everything, so back up first. Connect an external drive and run Time Machine, or make sure your important files are in iCloud Drive. Don't rely on memory for what's on the Mac — photos, documents, downloads and that one folder you forgot about. See our guide to backing up before a repair for a thorough checklist.
2. Sign out of your accounts
This is the step that matters most. Sign out of your Apple ID / iCloud so that Activation Lock is switched off — otherwise the Mac stays tied to your account and is useless to anyone else. On older versions of macOS, also sign out of iMessage. Skip this and you (or the new owner) will be back in touch trying to unlock a device that thinks it's stolen.
3. Open Erase All Content and Settings
On recent Macs (Apple silicon, or Intel Macs with a T2 chip running macOS Monterey or later), there's a one-click option just like an iPhone: go to System Settings → General → Transfer or Reset → Erase All Content and Settings. On older Macs, you'll instead restart into macOS Recovery (hold the right keys at startup), use Disk Utility to erase the drive, and then reinstall macOS — a few more steps but the same outcome.
4. Confirm the erase
Follow the prompts, entering your password when asked, to wipe the Mac securely. The Mac handles the secure erase for you — modern Macs encrypt their storage, so a proper reset genuinely removes your data rather than just hiding it. The Mac will restart when it's finished.
5. Restart to setup — or leave it for the next owner
After erasing, the Mac arrives at the welcome / setup screen, exactly as it looked out of the box. Set it up again for yourself, or simply leave it at that screen and power it down if you're handing it on — never complete the setup with your own details if someone else is taking it. Recycling it instead? See securely wiping a device before recycling.
Common mistakes to avoid
- Not signing out of iCloud first. The number-one cause of a "locked" Mac the next owner can't use — do it before you erase.
- No backup. A reset is final; once it's done, anything you didn't save is gone for good.
- Forgetting linked devices and subscriptions. De-authorise apps and check nothing important only lived on this Mac.
Resetting a Mac you're keeping
If you're erasing to fix problems rather than to pass the Mac on, the process is identical — but what you do afterwards differs. Instead of leaving the welcome screen for someone else, you'll set the Mac up as new and restore your files from the Time Machine backup you made in step one. You can bring everything back exactly as it was, or treat it as a chance to start lean and restore only what you actually use — often the quickest route to a Mac that feels genuinely brand new again, free of the clutter that built up over the years. Either way, sign back into your Apple ID, reinstall your key apps, and check everything works before you consider the job done.
If it won't erase or still feels sluggish
Sometimes a reset won't complete, the Mac gets stuck in Recovery, or — frustratingly — it's still slow afterwards. That last one usually means the real issue isn't software at all: an older Mac can benefit hugely from more memory, a healthy battery, or simply a professional tune-up. Our computer repair and laptop repair teams service Macs and can erase, reinstall and set everything up for you — with your data safe throughout — or advise honestly on whether it's worth repairing or replacing.