What is my User Agent

What is My User Agent? Free User Agent Viewer and Browser Detector

This free online tool instantly displays your browser's user agent string along with detailed information about your device, operating system, browser version, viewport size, and technical specifications. All detection happens directly in your browser for complete privacy.

What is a user agent?

A user agent is a string of text that your web browser sends to every website you visit. It identifies your browser type, version, operating system, and device. Web servers use this information to deliver content optimized for your specific setup. For example, a user agent string might reveal you're using Chrome 120 on macOS 14.6, allowing websites to serve appropriate styles and functionality.

How do I check my user agent?

You can check your user agent by visiting this page. The tool automatically detects and displays your complete user agent string along with parsed information about your browser, operating system, and device type. No manual input is required—the information is captured and displayed instantly when you load the page.

What is my browser user agent string?

Your browser user agent string is displayed at the top of this page. It's a technical identifier that contains encoded information about your browser (Chrome, Firefox, Safari, Edge, Opera), browser version, operating system (Windows, macOS, Linux, iOS, Android), and rendering engine. Web developers use this string to ensure compatibility and optimize user experience.

How to find user agent in Chrome, Firefox, or Safari?

Instead of manually checking browser settings or developer tools, you can simply visit this user agent checker tool. It works across all browsers including Chrome, Firefox, Safari, Microsoft Edge, and Opera. The tool automatically reads your navigator.userAgent value and displays it in an easy-to-read format with additional parsed details.

What information does a user agent reveal?

A user agent string reveals your browser name and version, operating system and version, device type (desktop, mobile, tablet), and rendering engine. Our tool goes beyond just showing the raw string—it also displays your current viewport size, screen resolution, color depth, pixel ratio, touch support status, language settings, timezone, and whether cookies are enabled.

Why do websites need my user agent?

Websites use user agent information to deliver content that works properly on your device. This includes serving mobile-optimized layouts to smartphones, ensuring JavaScript compatibility with your browser version, and providing appropriate download links for your operating system. It's a critical part of responsive web design and cross-browser compatibility.

What is a user agent parser?

A user agent parser is a tool that reads the raw user agent string and extracts meaningful information from it. This tool acts as a user agent parser by analyzing the string and identifying your specific browser, browser version, operating system, and device type. It converts the cryptic encoded string into human-readable details.

How to detect mobile vs desktop user agents?

Our tool automatically detects whether you're on a mobile device, tablet, or desktop computer by analyzing patterns in your user agent string. Mobile user agents typically contain keywords like "Mobile," "Android," or "iPhone," while tablet user agents include "iPad" or "Tablet." The tool displays your device type clearly in the results.

What is my viewport size and screen resolution?

The tool displays both your viewport size (the visible area of your browser window) and your screen resolution (your display's total pixel dimensions). The viewport size updates in real-time as you resize your browser window, making it useful for testing responsive designs. These measurements help web developers ensure their layouts work across different screen sizes.

What is navigator.userAgent?

The navigator.userAgent property is a JavaScript API that returns the user agent string of your browser. Web developers use this property to detect browser capabilities and optimize their code accordingly. This tool reads the navigator.userAgent value and presents it in an organized, readable format with additional context.

How do I test different user agents?

While this tool shows your actual user agent, web developers often need to test how their sites appear with different user agents. Most modern browsers include developer tools (F12) with device emulation features that allow you to spoof different user agents for testing purposes. This tool helps you verify what user agent your browser is currently reporting.

What browser am I using?

This tool identifies your browser by parsing your user agent string. It detects all major browsers including Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge, and Opera, along with their specific version numbers. The browser name is displayed prominently with a badge for quick identification.

Does my user agent change?

Your user agent string typically changes when you update your browser or operating system, as these updates modify the version numbers in the string. It can also change if you switch browsers or devices. The viewport and screen resolution values shown by this tool update dynamically when you resize your browser window or change display settings.