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A User-Agent is a small text string that browsers, mobile apps, bots, and crawlers send when requesting a web page. It tells the server what software, operating system, and device are making the request — for example: “Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.0”.
Websites use this information to optimize content, detect devices, filter bots, and analyze traffic. You can explore and decode any of these strings below with User-Agents-X.
Enter any User-Agent string to instantly parse browser, OS, device, engine, and more.
Developers • DevOps • QA Engineers • Security Analysts • Data Analysts
The Clean User-Agent Tool You Needed.
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Includes a public encyclopedia of real User-Agent strings.