It's a short, technical description of the web browser, operating system, (and maybe mobile device) that you're using as you access the internet. Your web browser sends it to every website you visit.
Get your users agent string, web browser, opera system, device information and more... Useragent is a small piece of data that is sent by your web browser when accessing a website or application.
The HTTP User-Agent request header is a characteristic string that lets servers and network peers identify the application, operating system, vendor, and/or version of the requesting user agent.
On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. [1] This includes all web browsers, such as Google Chrome and Safari, some email clients, standalone download managers like youtube-dl, and other command-line utilities like cURL.
Ever needed to quickly switch between user-agent strings on the fly? Developing a site that needs to work on both mobile browsers and desktop browsers? Sick of some archaic site blocking you because you're not using Netscape 4? The User-Agent Switcher for Chrome is the answer.
Basically User-Agent is a relic of the past, at least in theory (in browsers that is, in crawlers aka web spiders it can make sense). Browsers should not depend on its value, but some questionably made sites still do sometimes. You nearly never have to change it, that tiny percentage is annoying though. More on reddit.com
This site provides various user agent lists and technical information about them. The information is constantly updated and conveniently structured.
29 Jul 2025 · Think of it as your digital representative. Your browser (like Chrome, Firefox, Safari, or Edge), email apps, or even tools like cURL all act as ...
The extension enables user-agent spoofing on specific domains only; it is conversely possible to exclude certain domains from spoofing. Check the Options page for more info. 5. You can set per-site user-agent strings 6. There is an option to randomize user-agent strings. 7.
Usage example: You can alter your user-agent string to indicate you?re on a mobile device if you prefer seeing mobile versions of sites so they load quicker. -- This extension allows you to spoof your browser "user-agent" string to a custom designation, making it impossible for websites to know specific details about your browsing arrangement.
With this extension, you can quickly and easily switch between user-agent strings. Also, you can set up specific URLs that you want to spoof every time.
A User-Agent refers to the software used on the client side to access servers based on specific protocols.
A user agent is a small piece of text sent by web browsers or automation scripts in HTTP requests to identify the client's software, browser version, and operating system to the web server. What is a user agent header? The user-agent header is the specific HTTP request header that carries the user agent string from the client to the web server.
Google Admin Toolbox Useragent ; Mozilla Compatibility, Mozilla 5.0 ; Platform, Linux; Android 6.0.1; Nexus 5X Build/MMB29P ; Layout Engine, AppleWebKit 537.36 ...
The HTTP header User-Agent is a request header that sends a characteristic string to web servers, allowing them to identify the Operating System (OS) and browser of the client making the request. Every time your browser connects to a website, it includes the User-Agent field in the HTTP header.
A user agent is the software that acts on your behalf on the web — usually your browser. Learn what the User-Agent string is, how to read it, why it lies, and what is replacing it.
This is a simple utility for users who want to discover the 'user-agent' given by the device by default - "Display browser User-Agent and other useful device info." Bloatware is an odd description for a 1.37MB app.
Learn what the User-Agent header is, how it works, and why it is important for web development. See a real example of a User-Agent string used by Googlebot and other tips and concerns.
This extension is designed to shield your online privacy and make it super easy to appear as if you're browsing from different devices.
A user agent is a computer program representing a person, for example, a browser in a Web context.
Your 24/7 Claude agent. Claude Code and Browser Harness in a remote box.
Most common User Agent list up to date. Essential for web scraping, testing, and bot development. Covers browsers, crawlers, and AI agents. Updated weekly.
This document proposes a mechanism which might allow user agents to be a bit more aggressive about removing entropy from the User-Agent string generally by giving servers that really need some specific details about the client the ability to opt-into receiving them.
UAAG 2.0 guides developers in designing user agents that make the web more accessible to people with disabilities. User agents include browsers, browser extensions, media players, readers and other applications that render web content. A user agent that follows UAAG 2.0 will improve accessibility ...
In Chrome (Ver.114 or greater) on mobile devices, the model-key now shows up as 'k' in the useragent, but the correct model can be obtained via javascript. This is equivenlent to the the Operating System(OS) name. e.g. Windows or Android. This is equivenlent to the the Operating System(OS) version, this is usually described as an numbers separated by decimal points to denote Major, Minor and sometimes Patch releases.
er-agent, refers to a characteristic string of information that identifies the software, the hardware, and their versions used by a client (i.e.
User-agent checker instantly tells your browsers user agent. User-agent is the identifier which lets the server know what browser is requesting the resource or what operating system the request initiator uses.
User-Agent is like a secret code your browser shares with every website you visit. It reveals details about your browser, your operating system, and even some plugins you have installed.
Latest user agent strings for major browsers and OSs; checks for updates daily - jnrbsn/user-agents