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Separate browser profiles can keep cookies and other stored site data apart, but they do not necessarily make the browser or device look different to websites. A site can collect observable browser characteristics and combine them into a fingerprint, so two profiles on the same computer may expose similar signals even when their cookies are separate.
What a browser fingerprint reveals
Tor Project defines browser fingerprinting as “the systematic collection of information about the web browser to make educated guesses about its identity or characteristics.” A website can use one distinctive attribute or a combination of attributes to recognize or track a browser without relying on cookies. Tor Project explains browser fingerprinting and its protections.
Signals can include information about the browser, operating system, and how the device displays a page. Examples documented by Tor Project and Mozilla include:
- Fonts and rendering: Available fonts and the way text or other content renders can reveal system characteristics. Mozilla lists installed fonts as a fingerprinting input; Tor Browser limits font enumeration and uses character fallback. Tor Project and Mozilla.
- Window dimensions: The content area’s size can contribute to a fingerprint. Tor Browser uses letterboxing to reduce variation in the dimensions exposed to websites. Tor Project.
- Language and user-agent information: These values can add identifying detail. Tor Browser restricts language variation and standardizes user-agent information. Tor Project.
- Browser features and operating-system details: A browser’s feature set and OS-related information can also be observable. Tor Project cautions that ordinary browsers used over Tor may still reveal OS details, fonts, and plugins. Tor Project.
Why separate profiles may look alike
A profile boundary is useful for separating browser-stored data, such as cookies. A fingerprint, however, is assembled from characteristics a site can observe while a page is being used. If two profiles share a computer, operating system, installed fonts, hardware and rendering stack, and similar browser settings, some of their exposed characteristics may overlap.
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That overlap can make correlation possible, but it does not mean every website can uniquely identify or link every pair of profiles. The sources document fingerprinting signals and defenses; they do not establish a universal profile-linking rate.
Cookies, IP addresses, and fingerprints are different signals
Clearing cookies or using a separate profile affects stored browser data; it does not necessarily change the characteristics a site can observe. Changing the network route or IP address affects a network signal, not the browser’s exposed fonts, rendering behavior, or other device and browser traits.
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Tor Project specifically warns that connecting an ordinary browser through Tor does not give it Tor Browser’s anti-fingerprinting protections. That other browser may still reveal OS details, fonts, and plugins, and may retain cookies and cache. Tor Project’s guidance on using other browsers with Tor covers this distinction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How anti-fingerprinting defenses work
Tor Browser’s documented approach is to limit or standardize selected signals so users are less distinguishable from one another. Its measures include limiting font enumeration, letterboxing window dimensions, restricting requested languages, and standardizing user-agent values. The aim is to reduce fingerprint uniqueness while retaining necessary functionality—not to make every user identical or promise that tracking is impossible. See Tor Browser’s anti-fingerprinting documentation.
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In practical terms, keep these three ideas separate:
- Separate profiles partition some local browser data.
- A different IP address changes a network signal, not the browser’s fingerprint by itself.
- Anti-fingerprinting defenses limit or standardize characteristics a site can observe; their effect depends on the browser and its configuration.
A 2026 paper’s search-result abstract describes commercial server-side fingerprinting as combining browser attributes with longer-term state and as potentially resilient to changes in attributes. The full paper was not reviewed, so that abstract does not support a quantified estimate or a specific claim about how often separate profiles are linked. The paper search results provide the abstract-level context.
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