Generate User Agent Strings for Testing and Development

Our User Agent Generator helps you create user agent strings for different browsers, operating systems, and devices. Perfect for QA testing, web development, browser compatibility testing, API testing, and simulating different user environments.

What is a User Agent String?

A user agent string is a text identifier that web browsers and applications send to websites to identify themselves. It contains information about the browser, operating system, device type, and version information. Websites use this information to deliver appropriate content, detect device capabilities, and customize the user experience.

Components of a User Agent String

A typical user agent string contains:

• Browser Information: Chrome, Firefox, Safari, Edge, Opera, etc.
• Operating System: Windows, macOS, Linux, iOS, Android
• Device Type: Desktop, mobile phone, tablet
• Version Numbers: Browser version, OS version
• Engine Information: WebKit, Gecko, Blink

Supported Platforms

Desktop Operating Systems

• Windows: Chrome, Firefox, Edge, Opera, Safari
• macOS: Chrome, Firefox, Safari, Edge, Opera
• Linux: Chrome, Firefox, Edge, Opera

Mobile Operating Systems

• iOS: Safari, Chrome, Firefox (iPhone and iPad models)
• Android: Chrome, Firefox, Samsung Browser, Opera (various device models)

Common Use Cases

• QA Testing: Test how websites behave with different browsers and devices without needing physical devices
• Web Development: Debug browser-specific issues by simulating different user agents
• Browser Compatibility: Verify responsive design and feature support across different platforms
• API Testing: Simulate requests from different clients and browsers
• Web Scraping: Rotate user agents to avoid detection and rate limiting
• Analytics Testing: Test how analytics tools identify different browsers and devices
• Feature Detection: Test feature detection logic based on user agent strings

How to Use the Generator

1. Select Device Type: Choose between Desktop or Mobile
2. Choose Operating System: Select Windows, macOS, Linux (desktop) or iOS, Android (mobile)
3. Select Browser: Choose from available browsers for the selected OS
4. Device Model (Mobile Only): Optionally select a specific device model (iPhone, Samsung Galaxy, etc.)
5. Generate: Click "Generate User Agent" to create a user agent string
6. Copy & Use: Copy the generated string and use it in your browser, testing tools, or applications

Using Generated User Agents

Browser Developer Tools

• Chrome/Edge: DevTools → More Tools → Network Conditions → User agent (uncheck "Use browser default")
• Firefox: about:config → general.useragent.override
• Safari: Develop menu → User Agent → Custom

Command Line Tools

• cURL: Use -A flag: curl -A "USER_AGENT_STRING" URL
• wget: Use --user-agent flag

Programming Languages

• Python (requests): headers = {'User-Agent': 'USER_AGENT_STRING'}
• JavaScript (fetch): headers: {'User-Agent': 'USER_AGENT_STRING'}
• Node.js: Set user agent in HTTP request headers

Understanding User Agent Strings

Example Desktop User Agent:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

• Mozilla/5.0 - Legacy compatibility identifier
• Windows NT 10.0 - Operating system (Windows 10)
• Win64; x64 - Architecture (64-bit)
• AppleWebKit/537.36 - Rendering engine
• Chrome/120.0.0.0 - Browser and version

Example Mobile User Agent:

Mozilla/5.0 (iPhone; CPU iPhone OS 17_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Mobile/15E148 Safari/604.1

• iPhone - Device type
• CPU iPhone OS 17_1 - iOS version
• Mobile/15E148 - Mobile identifier
• Safari/604.1 - Browser and version

Best Practices

• Use Realistic User Agents: Our generator provides real, current user agent strings used by actual browsers
• Rotate User Agents: When web scraping, rotate between different user agents to appear more natural
• Match Device Types: Use mobile user agents when testing mobile-specific features
• Keep Updated: Browser versions change frequently - our generator includes recent versions
• Test Compatibility: Use different user agents to test cross-browser compatibility

Privacy Considerations

User agent strings can reveal information about your browser and device. When testing or developing:

• Use generated user agents for testing purposes only
• Be aware that some websites may block or limit access based on user agent strings
• For production applications, use your actual browser's user agent unless you have a specific reason to modify it

Random Generation

Use the "Generate Random" button to quickly get a random user agent string. This is useful for:

• Quick testing scenarios
• Web scraping with rotation
• Exploratory testing

Device-Specific User Agents

For mobile devices, you can select specific device models to get accurate user agent strings that match real devices:

• iOS: iPhone 15 Pro, iPhone 14, iPad Pro, etc.
• Android: Samsung Galaxy S23, Google Pixel 7, OnePlus 11, etc.

This ensures your testing accurately reflects how websites will appear on specific devices.

Privacy & Security

All user agent generation happens entirely in your browser. No user agent strings, selections, or personal information are transmitted to our servers. Your privacy is completely protected.