What private browsing does and does not hide

Private browsing, sometimes called a private window or incognito mode, keeps a session from being saved on the device you are using. When you close the private window, the browser discards the history, cookies and site data it created during that session, and it does not keep the form entries you typed. That makes it useful on a shared computer, but the feature is narrower than its name suggests. It changes what your own device remembers, and it changes very little about what other parties can see.

Many people assume that a private window makes them anonymous online. It does not. The websites you visit, the company that provides your internet connection, the network you are connected to and any monitoring software on a managed device can still observe much of the same activity. Knowing where the boundary sits helps you decide when private mode is the right tool.

What private mode clears on your device

While a private window is open, the browser keeps its cookies and site storage separate from your normal profile. These are the files that let a shopping site remember a cart or keep you signed in. When every private window is closed, that separate storage is deleted, so the next private session starts fresh. Your regular windows keep their own history and cookies and are not affected.

Private mode also stops the browser from adding the pages you visited in that session to your history list, and it does not save autofill suggestions for forms. Downloaded files remain on the device, however, and so do any bookmarks you created, depending on the browser. Many browsers also disable extensions in private windows by default. You can usually allow an extension to run there in its settings, but do so only for extensions you trust, because an extension can read the pages you open. A simple check shows what your browser keeps. Open your history page in a regular window and note the most recent entries, then run a short private session and open the history page again. The private visits will not appear there, although any files you downloaded will still be on the device.

What websites, networks and employers can still see

Each website you visit receives your internet address when your browser connects to it. An internet address can be linked to your general location and to your internet provider, and private mode does not change it. If you sign in to an account during a private session, the site knows exactly who you are and can record your activity under that account as usual. Private mode only removes the local copy of the session, not the record kept by the service.

Websites can also recognize a device without placing a cookie. Some sites combine details such as screen size, installed fonts and language settings to create a fingerprint that is often distinctive enough to match a returning visitor. Because the check happens again on each visit, opening a new private window does not reset it, although some browsers reduce how much detail they reveal.

Networks see less than the page content, but they still see a lot. In most cases, the network operator can tell which sites you connect to by name, even though the content of the pages is encrypted with HTTPS. Domain name lookups may also be visible to your network or to the DNS service it uses. On a work or school network, administrators may log these connections, and on a company-owned laptop, monitoring software can record activity whichever window is open. Private mode does not get around those controls.

When private browsing helps and when to use something else

Private mode suits several everyday situations. You can use it on a shared family computer so the next person does not see your search history, sign in to a second account on the same site without signing out of the first, or view a page without your existing cookies or login. It also works for a quick search you would rather not connect to the history saved on that device.

If your goal is to limit what networks or websites can observe, private mode is the wrong tool. Virtual private networks and the Tor network send your traffic along a different path, which changes what the local network and some sites can see. These tools move trust somewhere else, though. A VPN provider can see your traffic, and its promises about logging are only as reliable as its practices and any independent audits it publishes. Read how any such tool handles data before you rely on it.

Private mode also does not stop the sites you visit from running their own tracking during the session. Third-party code on a page can still set identifiers while the window is open, and it can still show you ads based on what you view during that visit. The mode limits what stays behind on the device, not what happens while you browse.

Private browsing protects the history on your device, not your identity online. Use it for what it does well, keep your browser updated and check your privacy settings from time to time. Treating it as one small part of a broader routine keeps your expectations realistic.