WhatMyIP.site

Your User Agent String

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System & Engine Analysis

Operating System: Detecting...
Browser Family: Detecting...
Browser Engine: Detecting...
Screen Dimensions: Detecting...
Primary Language: Detecting...
Cookies Enabled: Detecting...

What Is a User Agent?

A user agent is a small piece of data sent by your web browser when accessing a website or application. It identifies the type of browser, device, operating system, and browser version. This information helps websites ensure optimal performance and compatibility, and allows developers to customize their sites based on user agent data.

A browser's user agent string (UA) helps identify which browser is being used, what version, and on which operating system. When feature detection APIs are not available, use the UA to customize behavior or content to specific browser versions.

Common uses of user agent analysis:

  • User experience testing: Verify how websites render across different viewports and layout engines to maintain high-quality designs.
  • Browser compatibility testing: Ensure scripts and styles execute correctly across various legacy and modern browser versions.
  • Website personalization tools: Tailor content, language settings, and interface components based on the client's detected OS or device.
  • Browser security software: Cross-reference user agents to audit outdated software versions and identify malicious crawler bots.

Frequently Asked Questions

A user agent string is a text header transmitted by your browser to web servers. It contains details about your browser name, rendering engine, OS version, and client device.

It allows web servers to deliver optimized layouts (like mobile-friendly designs) and helps developers detect browser compatibility issues.

Yes. Developers can change the user agent string using browser developer tools or browser extensions to test how websites look on other platforms and devices.

No. A user agent only broadcasts technical specifications about your browser and device. It does not contain personal information like your name, email, or street address.