What a Mac factory reset does and when to use it

A factory reset wipes your Mac clean and reinstalls the operating system from scratch. Everything on your drive — files, apps, settings, accounts — gets erased. The Mac then boots up as if it just came from the factory, with no user data or customizations.

You would do this if you are selling or giving away the Mac, if the system has become too slow or unstable to fix another way, or if you want a completely clean start. A factory reset is not reversible, so back up anything you want to keep before you start.

If you are only trying to fix a slow Mac or remove an app, a reset is overkill. Restarting the Mac, clearing cache files, or uninstalling problem software usually solves those issues faster. A reset makes sense only when you have decided you want the drive completely blank.

Key Takeaways

  • Back up your entire Mac using Time Machine or another method before you start, because a factory reset erases everything.
  • On Intel Macs, restart into Recovery Mode by holding Command and R, then use Disk Utility to erase the drive and reinstall macOS.
  • On Apple Silicon Macs (M1, M2, M3), the process is similar but you may need to erase the drive from System Settings instead of Disk Utility.
  • After the reset completes, the Mac will restart and walk you through setup, asking for your language, time zone, and Apple ID.
  • The entire process takes 30 minutes to two hours depending on your Mac model and internet speed.

Back up your Mac before you erase it

Once you erase your Mac, the files are gone. Before you do anything else, copy everything you want to keep to an external drive or cloud storage.

The fastest way is Time Machine, Apple's built-in backup tool. Plug in an external hard drive, open System Settings, go to General > Time Machine, and click "Set Up Time Machine". Choose your external drive and let it run until the backup is complete. This usually takes an hour or more depending on how much data you have.

If you do not have an external drive, you can copy files manually to cloud storage like iCloud Drive, Google Drive, or Dropbox. Open Finder, drag your Documents, Desktop, and Photos folders to the cloud app, and wait for them to upload. This is slower than Time Machine but works if you only have a few folders to save.

How to reset an Intel Mac

Shut down your Mac completely. Then turn it back on and when ready hold down Command and R at the same time. Keep holding until you see the Apple logo or a spinning globe. This boots you into Recovery Mode, a special environment separate from your normal system.

Once Recovery Mode loads, you will see a menu with options like "Reinstall macOS" and "Disk Utility". Click "Disk Utility" and wait for it to open. On the left side, you will see your Mac's hard drive listed — usually called "Macintosh HD" or similar. Click it once to select it, then click the "Erase" button at the top.

A dialog box will ask you to name the drive and choose a format. Leave the name as "Macintosh HD" and make sure the format is set to "APFS" (the modern format) or "Mac OS Extended" (the older format). Click "Erase" and wait for the process to finish. This usually takes a few minutes.

After the drive is erased, close Disk Utility and go back to the Recovery Mode menu. Click "Reinstall macOS" and follow the prompts. The Mac will read and install the operating system — this takes 20 minutes to an hour depending on your internet speed. When it finishes, the Mac will restart and show the setup screen.

How to reset an Apple Silicon Mac (M1, M2, M3)

The process on newer Macs with Apple Silicon chips is similar but slightly different. Shut down your Mac, then turn it back on and hold down the power button (not Command and R). Keep holding until you see "Loading startup options". This takes about 10 seconds.

When the startup options screen appears, you will see your Mac's recovery partition listed. Click it, then click "Continue". You will be asked to sign in with your Apple ID — this is a security step to prevent someone else from erasing your Mac remotely. Enter your credentials and wait for Recovery Mode to load.

Once Recovery Mode is open, click "Erase Mac" in the top menu. A dialog will ask you to confirm — click "Erase" again. The Mac will wipe the drive, which takes a few minutes. After that, it will automatically reinstall macOS. The read and installation take 20 minutes to an hour.

If you see an error saying the drive cannot be erased, try opening System Settings instead. Go to General > Transfer or Reset > Erase All Content and Settings. This method works on some Apple Silicon Macs and is often faster than going through Recovery Mode.

What happens after the reset is complete

When the Mac finishes reinstalling macOS, it will restart and show the setup screen. You will be asked to choose your language, country, and time zone. Then it will ask whether you want to restore from a Time Machine backup or set up as a new Mac.

If you backed up with Time Machine and want to restore your files and settings, click "Restore from a Time Machine Backup" and plug in the external drive you used. The Mac will copy everything back, which takes as long as the original backup did. This is useful if you are keeping the Mac and just wanted a clean system.

If you are selling or giving away the Mac, do not restore from backup. Instead, click "Set Up as New Mac" and create a new user account. This leaves the Mac blank and ready for the next owner. You can then sign out of iCloud and any other accounts before handing it over.

Troubleshooting a stuck reset

If your Mac gets stuck during the reset — for example, the reinstall seems to hang or the erase takes longer than an hour — force restart it. On Intel Macs, hold down the power button for 10 seconds until the Mac shuts off, then turn it back on and return to Recovery Mode. On Apple Silicon Macs, hold the power button for 10 seconds, then turn it back on and hold the power button again to get back to startup options.

If the Mac will not boot into Recovery Mode at all, try restarting and holding Command-Option-R instead. This boots into Internet Recovery, which downloads macOS from Apple's servers instead of using the local recovery partition. It is slower but works if the local recovery is corrupted.

If you see an error about not enough disk space, the drive may have a problem. Try restarting into Recovery Mode again and running Disk Utility's "First Aid" tool on the drive before erasing. If First Aid finds errors it cannot fix, the drive may be failing and you may need to take the Mac to an Apple Store or a repair shop.

Frequently Asked Questions

Can I undo a factory reset after I have started it?

No. Once you click "Erase" in Disk Utility, the data begins to be overwritten and cannot be recovered through normal means. This is why backing up before you start is critical. If you realize mid-process that you made a mistake, force restart the Mac when ready to stop the erase, but understand that some data may already be lost.

Do I need an internet connection to reset my Mac?

Yes. During the reinstall phase, the Mac downloads macOS from Apple's servers, which requires an active Wi-Fi or Ethernet connection. If your internet is slow, the process will take longer. If the connection drops during read, the Mac will pause and resume when the connection returns.

Will a factory reset remove the password I set up?

Yes. A factory reset erases everything, including your user account and password. After the reset, the Mac will ask you to create a new account and password during setup. If you are giving the Mac to someone else, they will set up their own account at that point.

How long does a complete factory reset take?

The entire process usually takes 30 minutes to two hours. Backing up takes 30 minutes to an hour, the erase takes 5 to 10 minutes, and the reinstall takes 20 minutes to an hour depending on your internet speed. Older Macs and slower internet connections take longer.

What if I want to keep my files but just reinstall macOS?

You do not need a full factory reset. Instead, restart into Recovery Mode, click "Reinstall macOS", and follow the prompts without erasing the drive first. This reinstalls the operating system while keeping your files and apps. It is faster and safer than a full reset if you are only trying to fix system problems.