User Agent Generator

Developer

Generate realistic browser and bot user agent strings for testing web applications and APIs.

browserFirefoxmacOS
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0
mobileChromeAndroid
Mozilla/5.0 (Linux; Android 14; SM-S918B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36
botLinkedInN/A
LinkedInBot/1.0 (compatible; Mozilla/5.0; Apache-HttpClient +http://www.linkedin.com)
botSlackN/A
Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)
browserFirefoxLinux
Mozilla/5.0 (X11; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0

Your Current User Agent

Cloudflare-Workers

What is This Tool?

A user agent generator creates realistic browser User-Agent strings for Chrome, Firefox, Safari, Edge, and mobile browsers. Customize OS, browser version, and device type to generate authentic UA strings for testing, web scraping, and cross-browser development.

User-Agent strings identify the client to web servers: browser name/version, rendering engine, OS, and device type. Modern UA strings are notoriously complex due to legacy compatibility — Chrome's UA includes "Mozilla/5.0", "AppleWebKit", "Safari", and "Chrome" for historical reasons.

Common Use Cases

Cross-Browser Testing

Generate UA strings to test how your server or CDN responds to different browsers, versions, and devices.

Web Scraping

Rotate realistic User-Agent strings to avoid detection when scraping websites for legitimate data collection.

Bot Detection Testing

Test your bot detection and WAF rules by generating various UA strings including known bot signatures.

Analytics Debugging

Reproduce specific browser/device combinations to debug analytics tracking, device detection, and responsive serving.

Frequently Asked Questions

Why are User-Agent strings so complex?

Legacy compatibility. Every browser includes identifiers from older browsers to avoid being blocked by sites that check for specific UA substrings.

Is User-Agent being deprecated?

Chrome is reducing UA string information (User-Agent Reduction). Client Hints (Sec-CH-UA) is the proposed replacement for detailed client information.

Can I detect mobile vs desktop from UA?

Yes, but it's increasingly unreliable. Look for "Mobile", "Android", "iPhone" in the UA string. Prefer responsive design over UA-based serving.