User agent parser

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Parse user-agent strings online with this User-Agent parser tool. Instantly detect browser type, version, operating system, device model, and platform details from any HTTP User-Agent string. Common long-tail use cases include user agent parser online, detect browser from user agent string, and analyze user agent for OS and device info.

What is a User-Agent?

A User-Agent is a string sent by browsers, apps, or bots in the HTTP request header that identifies the client software and device. For example: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36. Parsing user agents helps determine the visitor’s environment and optimize experiences.

Why use a User-Agent Parser?

  • Browser detection: Identify if the client is Chrome, Firefox, Safari, or Edge.
  • OS insights: Recognize Windows, macOS, Linux, iOS, Android, and more.
  • Device type: Distinguish desktop, mobile, tablet, or bot traffic.
  • Analytics & logs: Enrich server logs or analytics reports with client details.
  • Debugging: Troubleshoot compatibility issues based on client environments.

How to use the User-Agent Parser

  1. Paste a User-Agent string from logs, browsers, or API requests.
  2. Run the parser to analyze the string.
  3. View results: browser name/version, operating system, device model, rendering engine, and platform type.

Who should use it?

  • Developers debugging browser compatibility issues.
  • Marketers & analysts understanding traffic by device and OS.
  • System admins reviewing server logs to identify bots or suspicious traffic.
  • QA teams verifying how apps behave across environments.

Examples

Desktop browser

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
Result: Chrome 120.0 – Windows 10 – Desktop

Mobile browser

User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X)
Result: Safari – iOS 17 – Mobile

Bot traffic

User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Result: Googlebot – Crawler – Bot

Best practices

  • Don’t rely solely on User-Agent detection—combine with feature detection for accuracy.
  • Watch for spoofing: Some bots disguise themselves as real browsers.
  • Update parser databases: Keep signatures current for new browsers and OS versions.
  • Use in analytics: Segment reports by device, OS, and browser for better targeting.

FAQ

Can User-Agent parsing detect exact device models?

Yes—for many smartphones and tablets, but accuracy depends on the User-Agent string provided by the client.

Is User-Agent parsing reliable?

Mostly, but some bots and privacy tools modify or mask their User-Agent. Use as a helpful signal, not absolute truth.

What’s the difference between User-Agent and client hints?

User-Agent Client Hints is a newer standard that replaces long UA strings with structured headers. Parsers still support legacy UA strings until full adoption.

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