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A royfish.dev report argues that device fingerprinting can help advertisers recognize browsers even when people clear cookies, use private browsing or change networks. The report describes how browser and hardware signals can be combined, but it does not establish how widely advertisers currently use the technique or what data any specific company collects.
A report published on royfish.dev warns that device fingerprinting can allow websites and advertising systems to recognize a browser without relying on cookies, raising privacy concerns as control over third-party cookies has drawn public attention. The report explains how browser settings, software and hardware characteristics can be combined into a recurring identifier, but it does not document how widely advertisers currently deploy the method or verify the specific data practices it describes.
Fingerprinting starts with information a browser sends as it connects to a website, including its IP address, browser and operating system, and language settings. A website can also run code in the browser that measures characteristics of the device. The report lists examples such as graphics processing behavior, processor characteristics, memory, screen details, audio processing, installed fonts and system information.
Individually, many of these signals are shared by large numbers of people. The report’s central point is that combining several signals can narrow the pool enough to distinguish a browser within a particular sample, even if the resulting profile is not unique worldwide. Network details may change when someone switches from home Wi-Fi to mobile service or uses a VPN, while some device and software characteristics may be more consistent. How reliably any combination identifies a person over time depends on the signals collected and how they change.
The report says fingerprinting can persist when users clear cookies, use a private-browsing window or connect through a VPN, because those steps do not necessarily make the browser’s other characteristics look different. That is a general technical warning, not proof that a particular site can identify every user in those circumstances. It also discusses browser defenses: some try to add variation to measurements, while others aim to make users’ browser configurations more alike.
The privacy concern is that cookie controls may not address every tracking method. If a browser can be recognized through characteristics exposed during ordinary website use, people may have less ability to interrupt tracking by deleting stored cookies or changing network connections. That can affect users who rely on private browsing or VPNs as part of their privacy practices.
The report also raises a broader concern about the possible uses of data gathered online, including ad targeting and profiling. Those points are presented as risks and scenarios, not as verified evidence that a named advertiser is buying account data or using it for government purposes. The distinction matters: fingerprinting is a described technique, while the scale, commercial use and downstream sharing of particular data require evidence about specific companies and services.
For readers, the practical takeaway is not that every website can identify them with certainty. Rather, browser and device signals can add to tracking risk, and privacy protections vary between browsers. The report’s account underlines the limits of treating cookie deletion as a complete reset, while leaving open how much real-world tracking can be prevented by available defenses.
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The report places fingerprinting within debate over third-party cookies, which have been used to recognize browsers across websites. It recounts that Safari and Firefox began blocking such cookies and that Google announced in 2020 that it planned to phase them out. Google later developed Privacy Sandbox, a set of proposed advertising technologies intended to provide alternatives to some cookie-based functions.
According to the report, Google eventually changed course and retained third-party cookies rather than replacing them as planned. It also criticizes Privacy Sandbox and refers to antitrust concerns. These are the author’s characterization and summary; the supplied material does not include statements from Google, browser makers, regulators or advertisers to independently establish those assessments. Nor does it give dates for each later policy change.
Fingerprinting differs from a cookie in that it does not depend on placing a small identifier in browser storage. Instead, it combines characteristics the browser or device exposes when a site loads. That difference changes the privacy problem: users may be able to clear a cookie, but they cannot necessarily remove the hardware and software traits that contribute to a fingerprint.
““There are two sources for data that can make up your fingerprint; the network request and the code environment.””
— The royfish.dev report
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How Widely Tracking Is Used
The supplied report does not quantify how many websites or advertisers use fingerprinting, how frequently it is used, or which companies collect or share such profiles. It provides no independent measurements, named cases or responses from the companies it discusses. Its claims about advertising products and the possible sale or government access of personal data are not substantiated with examples in the material provided.
It is also unclear how often a fingerprint remains stable as browsers and devices update, or how accurately it distinguishes one user from another in practice. A fingerprint may identify a browser configuration rather than a named person; connecting it to an account or identity would require additional information. The effectiveness of browser protections can also vary by implementation and site, and the report does not offer comparative test results.
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Evidence on Deployment and Defenses
The next step for understanding the issue is evidence about real-world deployment: independent testing of tracking on websites, documentation of what signals are collected, and clear disclosure from companies using those signals. The supplied source does not identify an upcoming study, regulatory decision or company announcement, so no specific milestone is confirmed.
Readers should watch for browser and regulator disclosures that explain what protections block, limit or alter fingerprinting, and for reporting that tests those protections across sites. Until there is more information, the report supports a cautious conclusion: cookie settings alone may not prevent recognition, but the extent and impact of fingerprint-based tracking remain unmeasured in the source.
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Key Questions
What is browser fingerprinting?
Browser fingerprinting combines information about a browser, its software and its device to help distinguish it from other browsers. Signals can include language settings, screen details, fonts and hardware behavior.
Does clearing cookies stop fingerprinting?
Not necessarily. Clearing cookies removes stored cookie data, but it does not automatically change the device and browser characteristics that a site may measure. The supplied report does not establish how well any particular site can recognize a user after cookies are cleared.
Does using a VPN prevent browser fingerprinting?
A VPN can change the network address a website sees, but it does not by itself change many browser or hardware signals. The report says those other characteristics may still contribute to a fingerprint; the result depends on what the site collects.
Can a fingerprint identify a person by name?
A fingerprint can help distinguish a browser configuration, but that is not the same as knowing a person’s name. Linking a browser to a named identity would require additional information, such as an account or other identifying data.
Which browsers limit fingerprinting?
The report describes approaches that add noise to measurements or make browser configurations more alike, and names Brave, Tor and Mullvad Browser as privacy-focused examples. It does not provide independent test results showing how effective each browser is across websites.
Source: hn
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