A factory reset wipes your personal files, accounts, and settings — but not the operating system itself
A factory reset removes everything you added to your device after you first turned it on: your photos, documents, email accounts, installed programs, browser history, and saved passwords. It returns the device to the state it left the factory, with only the operating system and pre-installed apps remaining. The reset does not delete the core software that makes your device run — that stays in place.
The confusion happens because "everything" sounds absolute. In practice, a factory reset deletes your personal data and customizations, not the fundamental software. Think of it like clearing out a house you rented: you remove your furniture and belongings, but the walls, plumbing, and electrical system stay.
Key Takeaways
- A factory reset removes all your personal files, photos, accounts, and installed programs, but leaves the operating system and factory apps in place.
- Once deleted, your personal data cannot be recovered through normal means, so back up anything you want to keep before starting the reset.
- Different devices reset differently: phones and tablets wipe data from internal storage, while computers may leave the hard drive structure intact depending on the method used.
- A factory reset does not remove malware or viruses that infected the operating system itself — for those, you need antivirus software or professional help.
What gets deleted during a factory reset
Your personal files disappear completely: photos, videos, documents, spreadsheets, downloaded music, and anything else you created or saved. Email accounts you set up are removed, along with stored messages. Programs you installed from the app store or downloaded from websites are gone. Browser bookmarks, saved passwords, and browsing history vanish. Text messages, call logs, and contact lists are erased. Any customizations you made — wallpapers, keyboard settings, notification preferences, display brightness defaults — reset to factory settings.
On Windows computers, a factory reset also removes user profiles you created, meaning login accounts disappear. On Macs, the same applies. On phones and tablets, all user data stored in the device's internal memory is deleted. Cloud-synced data — files stored in Google Drive, OneDrive, iCloud, or Dropbox — remains in those services unless you delete it separately from the cloud account itself.
What stays on your device after a factory reset
The operating system itself remains: Windows, macOS, iOS, or Android. The firmware — the low-level software that controls hardware functions — stays in place. Pre-installed apps that came with the device when you bought it return to their original state, with no personal data attached. System files and drivers that allow hardware to communicate with the operating system are untouched.
On some devices, the bootloader (the software that starts up your device) and recovery partition (a hidden section used for troubleshooting) also remain. These are essential to the device functioning at all, so the reset process protects them.
How data actually gets removed
When you start a factory reset, the device does not physically destroy data on the storage drive — it marks the space as available for new data to overwrite it. On most phones and tablets, this happens quickly because the device uses encryption by default. On computers, the speed depends on the reset method: a quick reset marks space as available, while a full wipe actually overwrites the space with zeros or random data, which takes much longer.
The practical result is the same: your files are not accessible through normal means. Specialized data recovery software might retrieve fragments of deleted files if the space has not yet been overwritten, but this requires technical skill and does not always work. For most people, a factory reset means the data is gone.
Why factory resets do not remove all security threats
A factory reset removes malware that lives in your personal files or installed programs, but not malware that has infected the operating system kernel or firmware itself. Some advanced viruses burrow deep into system files that the reset process does not touch. If your device was compromised at the firmware level, a factory reset alone will not clean it.
For this reason, if you suspect a serious infection, a factory reset is a good first step but may not be sufficient. Running antivirus software before and after the reset, or seeking professional help, provides better protection. On phones, the risk is lower because app stores have security screening, but it is not zero.
Preparing for a factory reset
Before you start, back up anything you want to keep. On phones and tablets, use your cloud account: Google Account for Android, Apple ID for iPhone and iPad. These sync photos, contacts, calendar events, and some app data automatically. On computers, use cloud storage like OneDrive, Google Drive, or iCloud, or connect an external hard drive and copy your files manually.
Write down any account information you will need after the reset: email addresses, usernames, and passwords for accounts you plan to set up again. Note any software licenses or product keys for programs you installed. Take a screenshot of your Wi-Fi network name and password if you do not have it written down elsewhere. Sign out of accounts before starting the reset if the device prompts you to do so.
The reset process differs by device type
On iPhone and iPad, go to Settings, then General, then Transfer or Reset, then Erase All Content and Settings. The device will ask for your Apple ID password to prevent someone else from reactivating it. On Android phones, go to Settings, System, Reset Options, then Erase All Data. The path varies slightly by manufacturer.
On Windows, go to Settings, System, Recovery, and choose Reset This PC. You can choose to keep your files or remove everything. On Mac, restart the computer, hold Command and R during startup to enter Recovery Mode, then use Disk Utility to erase the drive and reinstall macOS. Each method takes 15 minutes to an hour depending on the device and how much data is being removed.
When a factory reset is the right choice
A factory reset makes sense when you are selling or giving away a device and want to remove your personal information. It helps when a device has slowed down dramatically and you want to start fresh. It is useful when you suspect malware in your personal files or installed programs. It can fix persistent software problems that troubleshooting has not resolved.
A factory reset is not the right choice if you just want to free up storage space — deleting individual files or uninstalling programs you do not use accomplishes that without losing everything. It is not necessary for routine maintenance. It is not a substitute for antivirus software if you suspect a serious infection. And it should not be your first step if you are not sure what the problem is.
Frequently Asked Questions
Can I undo a factory reset?
No, a factory reset cannot be undone. Once it completes, your personal data is gone. This is why backing up before you start is essential. If you realize you need something after the reset, specialized data recovery services exist, but they are expensive and do not always work.
Will a factory reset remove viruses?
A factory reset removes viruses that live in your personal files or installed programs, but not viruses embedded in the operating system itself. If you suspect a serious infection, run antivirus software before the reset, then run it again after. If the infection persists, you may need professional help.
Does a factory reset delete files stored in the cloud?
No. Files in Google Drive, OneDrive, iCloud, Dropbox, or similar services remain in those accounts. The reset only removes files stored on the device itself. You can access cloud files again by signing into your account after the reset.
How long does a factory reset take?
On phones and tablets, expect 15 to 30 minutes. On computers, a quick reset takes 20 to 45 minutes, while a full wipe that overwrites all data can take several hours depending on storage size. The device will restart during the process.
What if my device gets stuck during a factory reset?
If the reset appears frozen, wait at least an hour before assuming it has failed — large devices take time. If it truly is stuck, try restarting the device and attempting the reset again. If that does not work, contact the manufacturer's support or visit a repair shop, as forcing a shutdown mid-reset can cause problems.