What Does a Factory Reset Do? Everything You Need to Know
Learn what a factory reset erases, what may remain in the cloud or on removable storage, how to prepare, and when to use it.
What a factory reset removes
On a phone or tablet, a factory reset removes local photos and files, downloaded apps, app data, accounts, messages stored only on the device, and personalized settings. The device restarts at its initial setup screen afterward.
Exact behavior varies by product. Windows, for example, offers both Keep my files and Remove everything during its reset process. Always read the confirmation screen instead of assuming every menu labeled Reset has the same effect.
What a factory reset may not remove
Data that was synced to iCloud, Google, OneDrive, or another online account remains in that account unless you separately delete it there. A reset removes the device’s local copy and account connection; signing in later may restore synced information.
An SD card, SIM card, eSIM, or other removable or carrier-managed item may require separate handling. Check the device’s summary screen and manufacturer instructions before selling or giving it away.
Prepare before you reset
Create a usable backup and verify that important photos, files, messages, authenticator access, and wallet items can be recovered. Know the Apple Account, Google Account, or Microsoft credentials associated with the device, because theft-protection systems may require them during setup.
- Back up and verify important data
- Transfer authenticator codes, wallets, and eSIM service if needed
- Confirm account passwords and recovery methods
- Charge the device and keep it connected to reliable power
- Use the instructions for the exact brand and model
When a factory reset makes sense
A factory reset is appropriate before selling, trading in, or giving away a device after your information has been transferred. It can also be a last troubleshooting step for serious software problems that remain after restarts, updates, storage cleanup, and manufacturer-recommended repairs.
It does not repair broken hardware, a worn battery, liquid damage, or an account lock. For an ordinary glitch, restart first because it is faster and does not require restoring your information.
Frequently asked questions
Does a factory reset delete everything?
It erases personal data and settings stored on the device. Cloud copies and some removable storage may remain and must be handled separately.
Can data return after a factory reset?
Yes, data previously backed up or synced may return when you sign in and restore it. Data that existed only on the erased device may be unrecoverable.
Will a factory reset fix a slow phone?
It may fix software-related problems, but it will not repair hardware, increase physical storage, or restore a worn battery.
Sources
Primary and official references used for this guide:
Published August 11, 2026 · Reviewed for clarity and source accuracy.