> For the complete documentation index, see [llms.txt](https://help.gpmloginapp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.gpmloginapp.com/gpm-login-global-en/getting-started/understanding-fingerprints/software-user-agent.md).

# Software: User Agent

A user-agent is a string of characters representing four main parameters: operating system, operating system version, browser type, and browser version. The user-agent string is attached to every request sent from the browser to the website, helping the website initially recognize which operating system and browser you are using.

Based on this information, the website can display the appropriate interface (for example: if you use a mobile device, the website will display a mobile interface; if you use a computer, it will display a PC interface) or customize functions to suit the user environment.

For example, consider the user-agent below:

`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36`

From this string, the website can determine that you are using Windows NT 10.0 (the core kernel of Windows 10 and Windows 11), a 64-bit operating system, and Chrome browser version 118.0.0.0.

The user-agent is not a unique piece of information; on the contrary, it is very common. For example, all computers running Windows 10 or Windows 11 and using the Chrome browser have the exact same user-agent. However, changing the user-agent can help bypass certain websites, but at the same time, it can make many websites suspect you are an "unreal" user when they compare the user-agent with other software parameters (operating system, browser version) sent from JavaScript.

In my personal opinion, unless there is a specific tutorial (TUT) or tip (TIP), you should not change this parameter.

Why can the website recognize your operating system and browser?

Each operating system or browser, or more specifically, each browser version has its own distinct components. JavaScript can be used to call these parameters. From there, the website can call and deduce which operating system, browser, and browser version you are using (although it may not be completely accurate, unofficial spoofed information can still be detected).


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