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What Is My User Agent? See Your Full User Agent String

What is my user agent? This free tool shows the exact user agent string your browser sends to websites and explains each part of it. It also lists the modern client hints your browser offers.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is My User Agent?

Your user agent is a line of text that your browser sends to every website to describe itself. It names the browser, its version, the rendering engine and your operating system. Servers read it to decide which version of a page to send, and analytics tools use it to count visitors by browser and device.

If you wonder “what is my user agent?”, the answer is shown above in full, ready to copy. The tool also explains what each part means, and lists the newer client hints that modern browsers offer.

How to Use This Tool

  1. Open the page. Your user agent string appears at once.
  2. Use the Copy button next to the heading to copy the string.
  3. Read the table that explains the browser, engine, system and device.
  4. Look at the client hints section for the structured details your browser can share.

Anatomy of a User Agent String

A typical Chrome string looks like Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0 Safari/537.36. Each piece has a job:

PartMeaning
Mozilla/5.0A historical prefix every browser still sends for compatibility.
(Windows NT 10.0; Win64; x64)The operating system and its architecture. NT 10.0 means Windows 10 or 11.
AppleWebKit/537.36The engine family, kept by Chrome-based browsers for historical reasons.
Chrome/130.0The real browser and its version.
Safari/537.36Another compatibility token that most browsers include.

The header is defined for the web in the MDN guide to the User-Agent header.

What People Use It For

  • Debugging. A user agent in a bug report tells developers exactly what to reproduce.
  • Testing. Developers copy strings to pretend to be another browser or a phone.
  • Logs and analytics. The string is how server logs identify browsers, bots and search engines.
  • Blocking bots. Crawlers announce themselves in the string, though anyone can fake it.

Client Hints and the Future of the String

Browsers are slowly reducing the detail in the classic string to protect privacy. Chrome now offers user agent client hints, which share the brand, platform and device type in a structured way, and share finer details only when a site asks. The tool shows the hints your browser supports.

For a plain-language summary of your setup, use the browser checker. To see the screen your browser runs on, try the screen resolution tool. To test how a server answers different browsers, request a page with the redirect checker, which can send mobile, Googlebot and Bingbot names.

Frequently Asked Questions

It is a line of text your browser sends with every request, naming the browser, its version and your operating system. Servers use it to serve the right version of a page.
It is a historical habit from the early web. Browsers copied each other so that sites would not block them, and the prefix stayed.
Yes. Browser developer tools let you pretend to be another browser or device, which is useful for testing mobile pages on a desktop.
Client hints are a newer, more structured way to share browser and device details. Chrome is reducing the detail in the old string and offering the rest through hints.

Disclaimer: results come from live requests and can change as records and servers change. We cannot guarantee that every answer matches what every visitor sees.