User Agent Parser

What is a User Agent?

A user agent is a string of text that web browsers and other client applications send to web servers to identify themselves. The user agent string contains information about the browser name, version, operating system, device type, and rendering engine. Web servers use this information to deliver content optimized for specific browsers and devices, enable browser-specific features, or collect analytics data about visitors.

User agent strings follow a specific format but can be quite complex and lengthy. Modern user agents often include compatibility tokens and version information for multiple components. For example, Chrome's user agent includes references to Safari and Mozilla for historical compatibility reasons, even though it's a distinct browser.

How to Use This User Agent Parser

1. View your current user agent: The tool automatically displays your browser's user agent string at the top of the page.
2. Parse your user agent: Click "Use Current" to analyze your own browser's user agent information.
3. Parse any user agent: Paste any user agent string into the text area and click "Parse" to analyze it.
4. View detailed results: The tool extracts and displays browser, OS, device, and engine information in an easy-to-read format.

User Agent Components

Browser: The web browser or client application name (e.g., Chrome, Firefox, Safari, Edge) along with its version number.

Operating System: The OS the browser is running on, including the version (e.g., Windows 10, macOS 14.1, Android 13, iOS 17).

Device: The type of device making the request, such as desktop, mobile phone, tablet, or specific device models for smartphones.

Engine: The rendering engine used by the browser (e.g., Blink, WebKit, Gecko) that determines how web pages are displayed.

Platform: Additional platform information that may include CPU architecture or device manufacturer details.

Why Parse User Agents?

Web development: Test how your website appears across different browsers and devices by analyzing their user agent strings. Check HTTP headers to see user agents in context.

Analytics: Understand what browsers, operating systems, and devices your visitors use to optimize your site accordingly.

Browser detection: Implement browser-specific features or workarounds by identifying the client's browser and version.

Security: Detect suspicious or outdated browsers that might pose security risks or need special handling.

Content delivery: Serve mobile-optimized or desktop-optimized content based on the detected device type.

Bot detection: Identify web crawlers, bots, and automated tools by examining their user agent signatures.

Common User Agent Patterns

Modern browsers include compatibility tokens like "Mozilla/5.0" for historical reasons. Chrome and Edge user agents contain "Safari" and "Chrome" tokens. Mobile browsers often include device model names. Bot user agents typically include identifiers like "bot", "crawler", or "spider" along with their purpose and contact information. Control bot access with our Robots.txt Generator.