User-Agent — is a string containing information about the browser and device that is automatically sent to a website or platform with every request. It contains information about the browser, its version, operating system and device type.
For example, a User-Agent may look like this:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Why User-Agent Is Needed
The User-Agent allows the service to understand which browser and device the user is coming from. This data is used for the website to work correctly, traffic analysis and protection against suspicious activity.
Why User-Agent Is Important in Traffic Arbitrage
When working with multiple accounts, User-Agent — is one of the parameters analyzed by anti-fraud systems. If dozens of accounts use the same User-Agent combined with other matching browser characteristics, this may become an additional signal for a review.
That is why in anti-detect browsers, each profile usually receives its own User-Agent corresponding to the selected operating system and browser.
Can User-Agent Simply Be Changed
User-Agent alone does not make a browser unique. In addition to it, websites and platforms analyze many other parameters: screen resolution, time zone, font list, browser language, device characteristics and other data.
Therefore, simply spoofing the User-Agent will not help completely change the browser profile. Anti-detect browsers that change several parameters at once are used for this.
Important to Know
User-Agent can be changed manually or automatically through special programs. However, it is important that it matches the other browser characteristics.
For example, if the User-Agent indicates that the latest version of Chrome on Windows is being used, while other parameters indicate macOS or a mobile device, such a combination will look suspicious to anti-fraud systems.
