Private Browsing vs Guest Mode: Which Local Data Is Kept?

A private window starts inside an existing browser profile but uses a temporary browsing session. Guest mode starts a separate temporary profile without the host profile's saved logins and history. The distinction matters on a shared computer.

Private window

Useful when the owner wants a temporary session. Bookmarks and some configured extensions may remain available, while temporary history and cookies are discarded when all private windows close.

Guest mode

Better when another person needs short-term access because it avoids exposing the owner's saved accounts and profile data. Downloads remain on the computer unless removed.

Shared limitations

Neither mode hides activity from websites, network operators or device-management software. Files, bookmarks and information submitted online can persist outside browser history.

Choose by ownership

Use private browsing for your temporary session and guest mode for someone else's session on your device. For a public computer, avoid sensitive accounts entirely when a trusted personal device is available.

Downloads are the common surprise

Both modes can leave downloaded files on disk even when the browser removes the download list. On a shared device, delete the file securely and check the default downloads folder. Printing, screenshots and copied clipboard data also exist outside browser history.

For account recovery

A private or guest session may trigger extra security checks because saved device state is absent. Do not start a critical recovery flow on an unfamiliar public computer when a trusted device is available.

Choose based on the starting state

A private window normally starts from your existing browser installation and may allow selected extensions, bookmarks or saved credentials. Guest mode aims to create a session separate from the usual profile. Exact behavior differs by browser, so check its current help page rather than assuming the labels are identical.

Neither mode makes the network private

Websites, employers, schools and internet providers can still observe relevant traffic, and account sign-in identifies the user. Downloads, printed pages, screenshots and clipboard contents can remain after the window closes.

On a public computer, avoid sensitive work entirely when possible. Closing a guest session reduces local history, but malware, keyloggers and administrator monitoring sit outside the browser's cleanup promise.