MDN Web Docs developer.mozilla.org › en-US › docs › Web › HTTP › Reference › Headers › User-Agent User-Agent header - HTTP | MDN October 28, 2025 - 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.
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.
WhatIsMyBrowser.com whatismybrowser.com › detect › what-is-my-user-agent What is my user agent? - WhatIsMyBrowser.com June 25, 2024 - 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.
The user agent string format is currently specified by section 10.1.5 of HTTP Semantics. The format of the user agent string in HTTP is a list of product tokens (keywords) with optional comments. For example, if a user's product were called WikiBrowser, their user agent string might be WikiBrowser/1.0 Gecko/1.0. The "most important" product component is listed first. The parts of this string ...
Learn how to decode and understand any user agent string sent by your web browser or other software. Use this tool to parse user agents by browser, OS, platform, hardware, software type and layout engine.
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 ...
Wikipedia en.wikipedia.org › wiki › User_agent User agent - Wikipedia October 24, 2025 - On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. 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 ...
User agents need to prevent malicious code on a site from being able to escape the user agent to modify the user's computer or access other origins. User agents meet this duty of protection by sandboxing components, using memory-safe languages, and employing security teams to find and respond to vulnerabilities.
Random User-Agent random-user-agent.com Random User-Agent and Switcher (browser extension) This extension is designed to shield your online privacy and make it super easy to appear as if you're browsing from different devices.
Chrome Web Store chromewebstore.google.com › detail › user-agent-switcher-and-m › bhchdcejhohfmigjafbampogmaanbfkg User-Agent Switcher and Manager - Chrome Web Store 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.
Browserless browserless.io › blog › what-is-a-user-agent What Is a User Agent? A 2025 Guide for Developers, Scrapers, and Teste August 5, 2025 - 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. It typically includes the browser name, version, operating system, and, occasionally, the device type.
Chrome Web Store chromewebstore.google.com › detail › user-agent-switcher-for-c › djflhoibgkdhkhhcedjiklpkjnoahfmg User-Agent Switcher for Chrome - Chrome Web Store 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.
Mozilla Add-ons addons.mozilla.org › en-US › firefox › addon › uaswitcher User-Agent Switcher – Get this Extension for 🦊 Firefox (en-US) 1 week ago - 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). Rating: 4.4 - 549 votes
DeviceAtlas deviceatlas.com › blog › list-of-user-agent-strings 2025: List of User-Agent strings | DeviceAtlas October 8, 2025 - 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 ...
Google developers.google.com › authorized buyers › rtb › user-agent targeting User-Agent targeting | Real-time Bidding | Google for Developers 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.
DNS Checker dnschecker.org › user-agent-info.php User-Agent Information - Instantly Check Browser User-Agent 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.
GitHub github.com › ag-ui-protocol › ag-ui GitHub - ag-ui-protocol/ag-ui: AG-UI: the Agent-User Interaction Protocol. Bring Agents into Frontend Applications. AG-UI: the Agent-User Interaction Protocol. Bring Agents into Frontend Applications. - ag-ui-protocol/ag-ui Starred by 10.1K usersForked by 931 usersLanguages TypeScript 30.5% | Python 19.8% | Kotlin 15.6% | Java 11.3% | Go 8.2% | Dart 7.9%
Chrome Web Store chromewebstore.google.com › detail › user-agent-switcher › kchfmpdcejfkipopnolndinkeoipnoia User Agent Switcher - Chrome Web Store 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 ...
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 ...
Your user agent is a string that web servers use to identify your browser and optimize content delivery. Learn what a user agent is, how to troubleshoot browser issues, and see your user agent details on this site.
Reddit reddit.com › r/firefox › what does user-agent really do? r/firefox on Reddit: What does user-agent really do? October 7, 2023 - When using Chrome user-agent for example, does it break or affect some kind of functionality when visiting other sites? Do I need to switch between using some other user-agents for specific sites and going to default for other sites?
UserAgents.io useragents.io List of User Agents strings | UserAgents.io List of user agents categorized by device and platform. Utility to parse user agents and get information like operative system device
W3C w3.org › WAI › UA › work › wiki › Definition_of_User_Agent Definition of User Agent - WAI UA Wiki 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.
MDN Web Docs developer.mozilla.org › en-US › docs › Glossary › User_agent User agent - Glossary | MDN A user agent is a computer program representing a person, for example, a browser in a Web context.
Google privacysandbox.google.com › protections › user-agent What is User-Agent reduction? | Privacy Sandbox October 27, 2025 - User-Agent reduction limits passively shared browser data to reduce the volume of sensitive information which leads to fingerprinting. The reduction is now complete.
Search Engine Journal searchenginejournal.com › sej › web dev seo How to Change User-Agents in Chrome, Edge, Safari & Firefox June 13, 2024 - 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 ...
OpenAI Help Center help.openai.com › en › articles › 11752874-chatgpt-agent ChatGPT agent | OpenAI Help Center Describe the task you want completed, and the agent will begin executing it. It will pause for clarification or confirmation when needed. Agent mode does not require technical skills, and can be guided or interrupted mid-task, making it accessible to many users and adaptable to changing needs.