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.
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.
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.
Find out your user agent string, browser, opera system, device and more with this tool. Learn what a user agent is and how it is used for feature detection and compatibility.
Oct 7, 2023 ... It's historically used as a signal to which browser you're using or what bot you are. Some sites (looking at you Google) use it or some other technique to ...
Jul 11, 2025 ... A user agent is a computer program representing a person, for example, a browser in a Web context. Besides a browser, a user agent could be a bot scraping ...
This extension is designed to shield your online privacy and make it super easy to appear as if you're browsing from different devices.
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.
List of user agents categorized by device and platform. Utility to parse user agents and get information like operative system device
Spoofing user agents carries both legal and ethical risks. Responsible use means maintaining consistency, transparency, and avoiding the impersonation of protected services. Introduction A user agent is a text string sent by your browser or script during an HTTP request to identify the client's software and operating environment to the server.
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. Please note that this does not provide improved privacy while browsing the Internet and that some sites might have other means to figure out that the browser is not what it pretends to be.
A2UI is an open-source project, complete with a format optimized for representing updateable, agent-generated UIs and an initial set of renderers, that allows agents to generate or populate rich user interfaces, so they can be displayed in different host applications, rendered by a range of UI frameworks such as Lit, Angular, or Flutter (with more to come).
Why is the extension file so large (4 MiB) compared to others? In order to provide almost perfect emulation of User-Agent values, User Agent-Switcher bundles a stripped-down version of BrowsCap. This allows us to derive all relevant JavaScript navigator.* browser/OS identification values from just a single value: The User-Agent value you enter (and a bit of magic behind the scenes).
The User-Agent (UA) string is contained in the HTTP headers and is intended to identify devices requesting online content. The User-Agent tells the server what the visiting device is (among many other things) and this information can be used ...
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36 Sec-Ch-Ua: ".Not/A)Brand";v="99", "Google Chrome";v="103", "Chromium";v="103" Sec-Ch-Ua-Arch: x86 Sec-Ch-Ua-Full-Version: 103.0.5060.134 Sec-Ch-Ua-Mobile: ?0 Sec-Ch-Ua-Platform: Windows Sec-Ch-Ua-Platform-Version: 15.0.0 · In cases where at least low entropy Client Hints are included, the UserAgent will be populated based on the contents of those headers even if User-Agent headers are present.
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.
AG-UI: the Agent-User Interaction Protocol. Bring Agents into Frontend Applications. - ag-ui-protocol/ag-ui
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. This information helps websites serve content tailored to different browsers and operating systems ...
Google Admin Toolbox Useragent ; Mozilla Compatibility, Mozilla 5.0 ; Platform, Linux; Android 6.0.1; Nexus 5X Build/MMB29P ; Layout Engine, AppleWebKit 537.36 ...
Learn what a User-Agent is in browser network requests, how it identifies your browser and OS, and why it matters for developers. Includes examples, analogies, and practical tips.
Understand User Agents in 2025: learn what they are, how they work, their impact on web content & automation, and ethical considerations. A complete guide for developers, marketers, and data professionals.
There are millions of different types and formats of user agents, we've collected them and organised them by browser type, operating system, platform, ...
Discover what a user agent is and how it facilitates web interactions. Learn about User-Agent strings and their role in web optimization.
What is a User-Agent string? A User-Agent (UA) string is a piece of text that devices send to web servers stating what kind of device and browser are being used. In simple terms, it acts as the messenger (agent) between the device and the web server. Websites use this information to show visitors the correct version of their site. It is a standard part of web architecture and is passed by all ...
A user agent is any software that retrieves and presents Web content for end users or is implemented using Web technologies. User agents include Web browsers, media players, and plug-ins that help in retrieving, rendering and interacting with Web content.
User-Agent reduction limits passively shared browser data to reduce the volume of sensitive information which leads to fingerprinting. The reduction is now complete.
A user agent is a small text description of your device that is sent with every web request. Websites can detect the browser you’re using and serve different content - this is why iPhone and Android users see special mobile websites when they ...
User agent is a HTTP request header string identifying browser, application, operating system which connects to the server. Not only browsers have user agent but also bots, search engines crawlers such as Googlebot, Google Adsense etc. which ...