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User Agent Parser

Parse and decode User Agent strings to identify browser, OS, device, and engine details.

Developer Tools Runs locally No data sent
browser OS device parser
User Agent String
Note: UA string parsing is heuristic-based. Spoofed or custom User Agents may not be identified correctly. All processing happens entirely in your browser —no data is sent to any server.

What is User Agent Parser?

User Agent Parser reads browser user-agent strings and extracts details such as browser family, rendering engine, operating system, device type, and bot signals. It is useful for support, analytics review, log inspection, and quick browser environment checks.

How to Use User Agent Parser

  1. Paste the user-agent string into the input area.
  2. Review the detected browser, OS, engine, and device fields.
  3. Check whether the parser flags the string as a bot or crawler.
  4. Copy the results into your debugging notes, ticket, or report.

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Understand User Agent Parser ▾
Example
Input UA: Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15...
Output →Browser: Safari 17, OS: iOS 17, Device: Mobile, Engine: WebKit
Common Use Cases
  • Identify browser, OS, and device details from copied UA strings
  • Inspect crawler and bot user agents during analytics or SEO debugging
  • Compare how different devices are reported in server logs
  • Check whether a support ticket contains a spoofed or unexpected UA string
Why Use This Tool
  • Useful for support tickets, analytics checks, and log review.
  • Helps distinguish browsers, engines, devices, and crawler traffic quickly.
  • Runs locally so pasted UA strings are not uploaded anywhere.
Frequently Asked Questions
Can User-Agent strings be trusted?

No —they can be spoofed by any client. Use UA parsing for analytics and soft detection, not for security decisions.

Does it detect bots?

Yes —common crawler bots (Googlebot, Bingbot, AhrefsBot, etc.) are flagged automatically.

What does User Agent Parser Online —Detect Browser, OS & Device do?

User Agent Parser Online —Detect Browser, OS & Device runs entirely in your browser and helps you complete this task without uploading data to a server.

Is User Agent Parser Online —Detect Browser, OS & Device free to use?

Yes. This tool is free to use and does not require sign-up.