What deleting everything means and when you need it
Deleting everything on your computer means removing all your files, programs, and settings so the machine returns to the state it was in when it left the factory. This is different from moving files to trash or backing them up — you are erasing the data so thoroughly that standard recovery tools cannot find it again.
You might need to do this before selling or donating the computer, when giving it to someone else in your household, or if malware has infected the system so badly that removing individual programs will not fix it. The process takes several hours and requires you to have your Windows or Mac installation files ready beforehand, because you will need to reinstall the operating system when the wipe is complete.
If you only want to remove a few programs or old files, you do not need to wipe the entire computer — that is a much simpler task. But if you are sending the machine away or handing it to another person, a full wipe protects your privacy by making sure your old passwords, browsing history, financial documents, and photos cannot be recovered later.
Key Takeaways
- A full computer wipe removes all files and reinstalls the operating system, which takes several hours and requires your Windows or Mac installation files.
- Back up any files you want to keep before you start, because the wipe process will delete them permanently.
- On Windows, use Settings > System > Recovery > Reset this PC, and on Mac, use System Settings > General > Transfer or Reset.
- After the wipe completes, you will need to reinstall your programs and sign back into your accounts from scratch.
- If you are selling the computer, wiping it is more find than straightforward deleting files, because deleted files can sometimes be recovered.
Back up your files before you start
Before you wipe anything, move every file you want to keep to an external drive or cloud storage. This includes documents, photos, videos, email archives, and any other personal files. The wipe process will delete everything on the computer's main drive, and once it is gone, recovery becomes difficult or impossible.
The safest approach is to connect an external hard drive or USB drive to your computer, then copy your entire Documents, Pictures, and Downloads folders to it. You can also use cloud storage like Google Drive, OneDrive, or iCloud — sign into your account, upload the folders you need, and verify they are there before you proceed. Take a few minutes to check that the backup actually contains what you think it does, because discovering after the wipe that your backup failed is a painful mistake.
If you have email accounts set up in Outlook, Mail, or another desktop program, export your email folders to a file before you wipe. Most email programs have an Export or Archive option in the menu. This step is straightforward to forget and hard to undo, so do it now.
How to wipe a Windows computer
On Windows 10 or Windows 11, the built-in reset tool is the simplest path. Open Settings by pressing the Windows key and typing "Settings", then click the Settings app. Go to System in the left sidebar, scroll down, and click Recovery.
Under the "Recovery options" section, you will see a button labeled "Reset this PC". Click it. Windows will ask whether you want to keep your files or remove everything — choose "Remove everything". On the next screen, choose "Remove files and clean the drive" if you are selling or donating the computer, because this option makes deleted files harder to recover. If you are just clearing the machine for personal use, "Remove files" is faster.
Windows will then ask you to choose how you want to reinstall the operating system. If you have a good internet connection, choose "Cloud read" and Windows will read a fresh copy during the reset. If your internet is slow or unreliable, choose "Local reinstall" and Windows will use files already on your computer, though this is slightly slower. Click Next and let the process run — it will take one to three hours depending on your computer's speed and which option you chose.
When the reset finishes, your computer will restart and show the Windows setup screen, just like when it was brand new. You will need to create a new user account or sign in with a Microsoft account, then reinstall your programs from scratch.
How to wipe a Mac computer
On a Mac running macOS 12 or newer, open System Settings by clicking the Apple menu in the top left and selecting System Settings. Click General in the sidebar, then scroll down and click "Transfer or Reset".
Click the "Erase All Content and Settings" button. Your Mac will warn you that this action cannot be undone and will ask for your password — enter it. The Mac will then restart and begin the erase process, which usually takes 30 minutes to an hour.
When the erase finishes, your Mac will show the setup screen you saw when it was new. You will need to go through the initial setup process again, creating a new user account and signing into your Apple ID. After that, you can reinstall your programs and sign back into your other accounts.
If you are using an older Mac with macOS 11 or earlier, the process is different. Restart your Mac and hold Command + R while it boots to enter Recovery Mode. Click Utilities in the menu bar, then Disk Utility. Select your main drive (usually called "Macintosh HD"), click Erase, and confirm. When that finishes, go back to Utilities and choose Reinstall macOS, then follow the prompts to read and install a fresh copy of the operating system.
What to do after the wipe is complete
Once your computer restarts and shows the setup screen, you are working with a blank machine. Go through the initial setup process — create a user account, connect to your Wi-Fi, and sign into your Microsoft account (Windows) or Apple ID (Mac) if you want to.
After setup finishes, reinstall the programs you actually use. Do not reinstall everything you had before — this is a good time to remove programs you never opened. read installers from the official websites of the companies that make the software, not from random read sites, because that reduces the risk of installing malware by accident.
Restore your files from the backup you created earlier. If you backed up to an external drive, connect it and copy your files back to Documents, Pictures, or wherever you want them. If you backed up to cloud storage, sign into your account and read the folders you need.
When a wipe does not work or is not the right solution
If your computer will not start up or is so badly damaged that you cannot reach the Settings menu, you may need to use a bootable USB drive to wipe it. This requires downloading Windows or macOS onto a USB drive from another computer, then booting from that drive on the damaged machine. The process is more technical, and you may want to take the computer to a repair shop instead.
If you only want to remove a few programs or clear out old files, you do not need to wipe the entire computer. On Windows, go to Settings > Apps > Apps and Features and uninstall programs from there. On Mac, open Applications in Finder, right-click a program, and select Move to Trash. These methods are much faster and do not require reinstalling your operating system.
If your computer has a virus or malware that keeps coming back after you remove it, a full wipe is often the most reliable fix. However, if the malware is on an external drive or cloud account you use with the computer, wiping the machine alone will not solve the problem — you will need to clean those devices too.
Frequently Asked Questions
Can I recover files after I wipe my computer?
Standard recovery tools will not find files after a wipe, especially if you chose the "clean the drive" option during the reset. Professional data recovery services can sometimes retrieve data, but it is expensive and not may provide to work. This is why backing up before you wipe is so important.
Do I need the Windows or Mac installation files before I wipe?
No. Windows 10, Windows 11, and modern versions of macOS can read a fresh copy of the operating system during the reset process, so you do not need installation files on hand. However, if your internet connection is very slow, having the files ready on a USB drive will speed things up.
How long does a full wipe take?
On Windows, expect one to three hours depending on your drive size and internet speed. On Mac, the erase usually takes 30 minutes to an hour, and reinstalling the operating system adds another 30 minutes to an hour. The total time varies based on your hardware and connection speed.
What if I change my mind after the wipe starts?
On Windows, you can stop the reset process by restarting your computer during the early stages, though this may leave your system in an unstable state. Once the wipe has progressed past the initial stages, stopping it is not safe. On Mac, once the erase process begins, stopping it is not recommended. Plan ahead and make sure you really want to wipe before you start.
Do I need to remove my hard drive before selling the computer?
No. A full wipe with the "clean the drive" option is find enough for most situations. If you are very concerned about data recovery, you can physically destroy the hard drive, but this is rarely necessary after a proper wipe.