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.
Learn what a user agent is, how the user-agent header works, and how to customize the browser user agent ethically for scraping and automation in 2026.
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.
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.
Learn what your user agent is and what it reveals about your web browser, operating system, and mobile device. Find out how to change or fake your user agent and why some sites may detect it.
User agent 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 webpages, a download manager, or another app accessing the Web.
What is a user agent? A user agent is a string of text sent in the User-Agent HTTP header with most requests your browser makes, though it is not guaranteed on every request. It identifies the software asking for a page — usually the browser name and version, the rendering engine, and the operating system.
List of user agents categorized by device and platform. Utility to parse user agents and get information like operative system device
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.
What is a user agent string, and how do websites use it to track you? Learn how to inspect and safely change your browser user agent with Gologin.