Random User Agent Generator
Generate realistic user agent strings for web scraping, testing, and development — filter by browser and operating system.
How to Use the User Agent Generator
Generate realistic user agent strings for web testing and development.
- Select browser from Chrome, Firefox, Safari, Edge, Opera, or all browsers.
- Choose OS from Windows, macOS, Linux, Android, iOS, or all platforms.
- Set quantity from 1 to 50 user agent strings to generate.
- Click Generate to create random user agent strings matching your filters.
- Copy the results for use in HTTP requests, web scraping, or testing.
What is a User Agent?
A user agent string is a text identifier that web browsers and applications send to web servers with every HTTP request. It identifies the client software, operating system, device type, and rendering engine being used to access a website.
Web servers use user agent strings to deliver appropriate content — mobile-optimized pages for phones, browser-specific features, or OS-specific downloads. Developers use them for analytics, feature detection, and compatibility testing.
User agent strings typically include the browser name and version, rendering engine (like Blink or Gecko), operating system, and device information. The format varies by browser but follows general conventions established over decades of web development.
User Agent String Components
A typical user agent string contains several parts:
- Browser/Application: The client software name and version (e.g., Chrome/120.0)
- Rendering Engine: The browser's layout engine (WebKit, Blink, Gecko)
- Operating System: Platform and version (Windows 10, macOS 14, Android 13)
- Device Info: Device model and type (especially for mobile)
- Compatibility Tokens: Legacy identifiers for backward compatibility
Example User Agents by Browser
| Browser | Platform | Example String |
|---|---|---|
| Chrome | Windows | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 |
| Firefox | Linux | Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0 |
| Safari | macOS | Mozilla/5.0 (Macintosh; Intel Mac OS X 14_2) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Safari/605.1.15 |
| Chrome | Android | Mozilla/5.0 (Linux; Android 13; Pixel 7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36 |
Common Use Cases
Web Scraping: Rotate user agents to mimic different browsers and avoid detection when scraping websites at scale.
Automated Testing: Test how websites respond to different browsers and platforms without maintaining multiple physical devices.
API Development: Test user agent parsing, device detection, and browser-specific logic in web applications.
Analytics Testing: Verify that analytics platforms correctly identify browsers, operating systems, and devices.
Feature Detection: Test progressive enhancement and browser capability detection without manual testing across all platforms.
User Agent Best Practices
Respect robots.txt: When using user agents for web scraping, always check and follow the website's robots.txt file and terms of service.
Use realistic strings: Our generator creates realistic, current user agents. Fake or outdated strings may be blocked by servers.
Rotate agents: For scraping, rotate between different user agents to distribute requests and avoid patterns that trigger anti-bot systems.
Match your traffic: If testing, use user agents that match your actual user base demographics for accurate results.
Don't rely on UA alone: Modern feature detection (like Modernizr) is more reliable than user agent sniffing for determining browser capabilities.