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.
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.
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.
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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 ...
Understand what information is contained in a Chrome user agent string. Get an analysis of your or any other user agent string. Find lists of user agent strings from browsers, crawlers, spiders, bots, validators and others..
Grab the most up-to-date user agents for Chrome, Safari, Firefox, and Edge. These are essential for web scraping, automated screenshots, and bypassing bot blocks.
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.
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.
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.
Your browser sends its user agent to every website you connect to.
In its simplest form, a user agent is a line of text or string that identifies the browser to the web server. While that may sound simple, understanding how user agents function can be a bit complicated.
The "User-Agent Switcher and Manager" extension enables you to modify your browser's User-Agent string, which web servers use to deliver content tailored to your browser type and operating system. This can result in different HTML content, styling, or JavaScript behavior.
For example, a website might use the user agent string to determine if you’re on a mobile device. If so, it will serve you the mobile-optimized version of the site, which is designed to load quickly and be easy to navigate on a smaller screen. Similarly, if you’re using an older browser, the website might serve you a simpler version of the site that’s compatible with your browser’s capabilities.
Answer: In W3C usage, a user agent is a browser, media player, or extension. It is the software that delivers the content, not the content itself. The W3C User Agent Accessibility Guidelines (UAAG) 2.0 definition of a user agent.
In short, a User Agent (UA) is a text string that acts like a “digital ID card” or “passport” your web browser (or any internet connected software) automatically sends to the server of each website you visit.
Understand user agents, their role in bot detection, and how to customize them ethically for scraping and automation. Get tips and tools for testing in 2025.
Discover what a user agent is and how it facilitates web interactions. Learn about User-Agent strings and their role in web optimization.
Jul 28, 2024 ... How do you change the user agent string? I'd like to know for testing purposes. In Firefox you can set general.useragent.override but this doesn't have any ...
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.
The User-Agents.Net website provides various user agent lists and technical information about them.
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.
Discover what a User-Agent is and how to check User-Agent strings. Learn how to manage your User-Agent for better privacy, security, and optimized browsing experiences with our comprehensive guide.
Google Admin Toolbox Useragent ; Mozilla Compatibility, Mozilla 5.0 ; Platform, Linux; Android 6.0.1; Nexus 5X Build/MMB29P ; Layout Engine, AppleWebKit 537.36 ...
We've collected millions of user agents and have categorised a selection of them here for you, based on many of the things we detect about them - Operating System, Browser, Hardware Type, Browser Type, and so on.
The new API will use headers to modify the version and format of the response. Every request, either by browser or application, sends header information every time you visit any website. For example, a commonly used header called "UserAgent" tells a website what type of device you are using so it can tailor the best experience for you.
A user agent is a relatively short bit of text that (attempts to) describe the Software/Browser (the "Agent") that is making the request to a website. Web browsers include the user agent string in the requests they make to websites.
Since this criterion was written, the HTML Living Standard has adopted specific requirements governing how user agents must handle incomplete tags, incorrect element nesting, duplicate attributes, and non-unique IDs.
A user agent is a type of software that acts as an intermediary between a user and a network service, like a website.