Free Random User Agent Generator – Browser UA Strings

Generate random user agent strings for web testing and development. Desktop browsers, mobile devices, and bot/crawler signatures. 100% free, browser-based.

What Is a User Agent?

A user agent (UA) is a string sent by browsers to identify themselves to web servers. It contains information about the browser, operating system, and device.

User Agent Structure

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

Components:

• Mozilla/5.0 — Historical compatibility token
• Platform — OS and architecture
• Engine — Rendering engine (WebKit, Gecko)
• Browser — Name and version

Why Generate User Agents?

Web Testing: Test how sites respond to different browsers without needing multiple devices.

Web Scraping: Rotate user agents to avoid detection and rate limiting.

Responsive Testing: Verify mobile-specific features by simulating mobile browsers.

Bot Detection Testing: Test how your site handles crawler traffic.

Available Categories

Desktop Browsers

• Chrome — Windows, macOS, Linux
• Firefox — Windows, macOS, Ubuntu
• Safari — macOS only
• Edge — Windows, macOS

Mobile Devices

• Chrome Mobile — Android phones
• Safari Mobile — iPhone, iPad

Bots/Crawlers

• Googlebot — Google search crawler
• Bingbot — Microsoft search crawler
• YandexBot — Yandex search crawler
• Facebook Bot — Facebook link preview

How to Use User Agents

In HTTP Requests

fetch(url, {
  headers: {
    'User-Agent': 'Mozilla/5.0 ...'
  }
});

In Browser DevTools

1. Open DevTools (F12)
2. Go to Network Conditions
3. Uncheck "Use browser default"
4. Paste custom user agent

In Puppeteer/Playwright

await page.setUserAgent('Mozilla/5.0 ...');

Frequently Asked Questions

Are these real user agents?

Yes. These are actual user agent strings from current browser versions.

How often should I rotate user agents?

For scraping: every few requests. For testing: as needed per test case.

Can websites detect fake user agents?

Some sites use fingerprinting beyond user agents. Use agents matching your actual browser for best results.

Which user agent is best for testing?

Chrome on Windows is most common. For mobile, iOS Safari represents significant traffic.

Related Tools

• Random MAC Address — Generate MAC addresses
• Random IP Generator — Generate IP addresses
• UUID Generator — Generate unique IDs

Select a category and click Generate to create user agent strings instantly.