A shared computer can be convenient when you are traveling, visiting a library, staying at a hotel, or borrowing a friend’s laptop. It can also expose your browsing history, login sessions, and personal information to the next person who uses it.
Private browsing, called Incognito in Google Chrome, InPrivate in Microsoft Edge, and Private Browsing in Firefox and Safari, reduces the information the browser keeps after your session ends. It is a useful privacy tool, but it is not an invisibility shield.
What does private browsing do on a shared computer?
Private browsing opens a separate browser session. After you close every private window, the browser generally removes the session’s browsing history, cookies, site data, and information entered into forms.
According to Google Chrome’s official Incognito guidance, Chrome does not retain a record of visited sites or new site data after all Incognito windows close. Google specifically identifies shared computers as a situation where Incognito can be useful.
Similarly, Microsoft explains that Edge InPrivate deletes browsing history, cookies, passwords, addresses, and form data when you close all InPrivate windows.
Private browsing can help prevent the next computer user from:
- Seeing websites in the browser history
- Reopening an authenticated session through retained cookies
- Viewing information entered into forms
- Finding credentials accidentally saved during the session
- Seeing searches through the browser’s local history
Does private browsing save passwords or account logins?
Private browsing is designed not to retain new passwords or login cookies after the session closes. However, you still need to sign out manually before closing the browser.
Microsoft’s guidance for public computers recommends using a private window, signing out when finished, and closing every browser window. Closing only one tab may not end the private session if another private window remains open.
Never select options such as:
- Remember me
- Keep me signed in
- Save password
- Trust this device
- Stay signed in
If the shared computer asks to save your password, select Never or decline the request.
What does private browsing not protect?
Private browsing primarily protects against local browser history remaining on the device. It does not make your online activity anonymous.
Google states that Incognito does not make users invisible. Websites, schools, employers, and internet service providers may still observe activity. Downloads and bookmarks also remain on the computer unless you remove them yourself.
Firefox explains that private browsing does not protect against malware, hide physical location from websites, or prevent an internet provider from seeing online activity.
Private browsing also cannot protect you from:
- Keylogging malware that records keystrokes
- Screen-capture software
- Fake login pages
- Someone watching over your shoulder
- Network monitoring
- Files you download and leave behind
- Bookmarks created during the session
- Activity saved to an account after you sign in
This distinction matters because users may feel safer than they actually are. The FTC reported that more than one million people reported identity theft in 2025, reinforcing the importance of protecting login credentials and personal data wherever you sign in, according to the agency’s online security resources.
Should you access banking or email on a public computer?
Avoid it whenever possible. A private window cannot tell you whether the computer has malware, a keylogger, or unauthorized monitoring software.
The United Nations Office of Information and Communications Technology advises against entering sensitive information on public computers, including logging into work email, banking, or other accounts containing sensitive data.
Use your own phone and cellular connection instead for:
- Online banking
- Credit card accounts
- Medical portals
- Government services
- Password managers
- Work systems
- Tax information
- Account recovery
If you absolutely must use a shared computer, enable multifactor authentication and never approve a prompt asking you to trust that device permanently.
How do you open a private browsing window?
Google Chrome
Select the three-dot menu and choose New Incognito window.
Keyboard shortcut:
- Windows, Linux, or ChromeOS: Ctrl + Shift + N
- Mac: Command + Shift + N
Microsoft Edge
Select the three-dot menu and choose New InPrivate window.
Keyboard shortcut:
- Windows: Ctrl + Shift + N
- Mac: Command + Shift + N
Mozilla Firefox
Open the menu and select New private window.
Keyboard shortcut:
- Windows or Linux: Ctrl + Shift + P
- Mac: Command + Shift + P
Confirm the private-browsing indicator appears before entering any information.
What should you do before leaving a shared computer?
Use this step-by-step cleanup routine:
- Sign out of every website and app.
- Close every private browsing window.
- Delete downloaded files from the computer.
- Empty the recycle bin or trash if permitted.
- Remove files from the browser’s download folder.
- Disconnect any USB drive or external device.
- Confirm that no account remains visible.
- Restart the computer if that option is available.
The FTC recommends logging out when you finish using an account instead of remaining permanently signed in, particularly when using an unfamiliar network or device.
How does private browsing help someone become safer online?
Private browsing reduces the amount of account and browsing information left for the next person using the computer. That limits casual exposure from retained cookies, form entries, account sessions, and browser history.
It helps someone become safer online by:
- Reducing locally stored browsing data
- Preventing new login cookies from remaining after closure
- Lowering the chance of accidentally saving credentials
- Separating a temporary session from the regular browser profile
- Encouraging deliberate sign-out and cleanup
- Protecting searches from other people who use the same device
Private browsing works best as one layer of protection, not the only layer. Avoid sensitive accounts, use multifactor authentication, watch for shoulder surfing, and prefer a personal device whenever possible.
Private browsing is the right tool when your goal is to leave less information behind on a shared computer. It can remove local history, cookies, and session data after every private window closes.
However, it cannot detect malware, stop keyloggers, hide activity from websites or network operators, or protect files left in the Downloads folder. Use a private window, sign out manually, close every window, and avoid high-value accounts on computers you do not control.
