Short answer: A digital footprint is the set of traces a person leaves on the internet and on devices. Some of those traces are things they chose to publish. Others are records machines keep of a visit. The usual split is active versus passive. Tor Browser is built to shrink the passive side: the address a site sees, a history that outlives the session, a browser that stands out. A login, a name in a form, and a file you upload stay what they are. You said who you were.
A standard reference calls this a digital footprint, and sometimes a digital shadow: the traceable activities, posts, and messages that show up online or on a device. The phrase usually points at a person. It can point at an organization. It names a record. It does not name a place, and it does not name a program you install.
Active traces
An active footprint is information you put online on purpose. A post, a comment, an upload, a profile, an edit made while signed in, a form with your name in it. The stored row is often tied to the account you used. Public writing on the term treats that as the trail you meant to leave. Other people can copy a public post. This article stops at the choice. You sent it.
Passive traces
A passive footprint is the trail written down without a separate decision to publish. The examples in the reference literature are ordinary ones: browsing history, cookies, the address of the connection, location from an app, and the small technical details a page can read from the browser. You opened something. You did not sit down to publish a biography. A log grew anyway.
Opening a page is still an act. "Passive" marks the lack of an intent to publish, and it marks how widely the record can spread. A hit in a server log can hold an address, a time, and where the request came from. On a machine you do not administer, someone with access to that machine may see that it was used, with no name attached. How far the record goes still depends on the site, the software, and how long anyone keeps the log.
Ordinary browsing
A normal browser spreads one visit across several holders. The browser can keep history and cookies on the computer. The provider can see which sites the connection asked for. The site can see the address you connected from, and it can set a cookie so the next visit looks like the same browser. A private or incognito window mainly stops the browser from writing that history onto the device. The provider and the site can still see the visit.
Public explainers of privacy browsers say this in plain language. Private mode is a local setting. The visit is still visible to the network and to the site. That ordinary arrangement is a large passive footprint, plus whatever you actively type.
Why it matters for Tor
Tor Browser aims at that passive trail. The Tor Project describes the network in three parts. Your provider, and anyone watching the local connection, should not learn the names of the sites you open. The site, and anyone watching the site, sees a connection from the Tor network rather than your own address, and does not learn who you are unless you identify yourself. Tor can also reach sites a local network blocks.
The browser cuts the same problem a second time. By default it does not keep a browsing history. Cookies last for the session, until you quit or request a New Identity. That control closes the tabs, clears cookies and history, and uses new circuits, so the next bout of browsing is harder to tie to the previous one. The project also says the browser itself does not collect your address, your history, device identifiers, or location.
A person watching your network can still see that a connection to Tor is happening. A bridge is the documented way to make that fact less obvious. The fact of Tor use is a coarse trace. It is a connection to the network, not a list of pages.
Fingerprinting is the passive trace that does not need a cookie. A site can combine window size, fonts, language, and other traits into a guess that the same browser came back. Tor Browser tries to make those traits less unique. The glossary entry is fingerprinting, and letterboxing is one piece of the window work. Directory write-ups describe the same bundle of signals, and the same limit a login imposes: the site learns the account. This page follows the Tor Project's manuals for what the browser does.
What stays on the record
The Tor Project's safety notes are direct. Perfect anonymity is not available. Tor covers applications that send their traffic through it. Other programs on the computer keep their own connections. Those connections are a footprint the browser never carried. The short name for the official browser is Tor Browser.
Sign in, or type a name, an email, an address, or a phone number, and the site knows who you are. It still does not learn your network location from the Tor path. The account is an active trace. The Electronic Frontier Foundation's Tor guide says the same thing: a login or an identifying form tells that site who you are, and can also show that the visit came over Tor. EFF adds that a file downloaded through Tor can contact the network later if you open it in an ordinary application. That trace sits in the file. Tags inside photos and PDFs are covered in photo and PDF metadata.
Some records stay on the computer after a careful network path. The project's privacy policy says bookmarks and downloads are saved on the device and are not removed for you. Settings you changed can remain. With private browsing left on, session history and cookies are cleared when the desktop browser closes, or when you use New Identity. Turn private browsing off, and history and cookies can remain. That list is the edge of the term. It describes what the software keeps. It is not a procedure for wiping a disk.
What this encyclopedia means
Here, "digital footprint" means that whole trail: accounts and posts you chose, passive records of browsing, and leftovers a program stores locally. It is a reading term. It is not a market label, not a score, and not a promise that Tor deletes what you already sent.
A guide on this site uses the term when it has to keep three questions apart:
- Did this visit include a name, an account, or a file you attached on purpose?
- Which observer can see the destination, the origin, or only that Tor was used?
- Does the trace live in this browser session, on the site, or on the device after you quit?
Tor, in the sense of this encyclopedia, is the network and the browser aimed at the passive, network-level part. New Identity is the control that unlinks the next session from this one. A directory that treats "footprint" as a shopping slogan is using a different word. This page is the definition.
A compact comparison
| Trace | Ordinary browsing | Tor Browser, as shipped |
|---|---|---|
| Post, upload, or login | Tied to the account, and often to your address | Still tied to the account. The site sees an exit relay. |
| History and cookies | Often kept on the device | Kept for the session. Cleared on exit or New Identity, with private browsing left on. |
| Address the site sees | Yours | An exit relay |
| Destination the provider sees | Often the site name | A connection to Tor, not the list of sites |
| How unique the browser looks | Many distinctive traits | Deliberately crowded. Add-ons and a custom window can single you out again. |
| Files you keep | Stay on disk, tags included | Same. Downloads are kept. |
Sources
- Wikipedia, Digital footprint: the active and passive split, and the idea of a traceable record of online activity.
- Tor Project, About Tor Browser: what the provider sees, what the site sees, history, and session cookies.
- Tor Project, glossary: browsing history, cookies, New Identity, and the browser's own short definition.
- Tor Project, Managing identities and best practices: logins, forms, and the limit of what Tor covers.
- Tor Project, fingerprinting protections and the privacy policy: a less unique browser, and the local leftovers (bookmarks, downloads, settings).
- Electronic Frontier Foundation, How to: Use Tor: a login identifies you to that site, and a downloaded file can reach the network later if opened outside Tor.