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User-Agent Parser

Developer Tools

Browser/OS/device · bot detection

Quick Answer

User-Agent Parser: Browser/OS/device · bot detection. User-Agent Parser uses standard developer formulas to compute accurate results instantly.

User-Agent
Identified as
Chrome 126
Windows 10 / 11 · Desktop
BrowserChrome 126.0.0.0
OSWindows 10 / 11
DeviceDesktop
BotNo

Parsing steps

  1. 1Browser: matched token → Chrome 126.0.0.0
  2. 2OS: Windows 10 / 11
  3. 3Device class: Desktop
UA parsing is token-matching, not truth: browsers deliberately lie (every modern UA starts with "Mozilla/5.0" for historical compatibility, and Chrome now freezes parts of the string under User-Agent Reduction). Order matters — Edge contains "Chrome", Chrome contains "Safari", so checks must run most-specific first. For production use, prefer the User-Agent Client Hints API (navigator.userAgentData) on Chromium, and a maintained library like ua-parser-js for exhaustive coverage.

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How to Use

  1. Paste or type content: drop code/text into the User-Agent Parser or fill the parameters.
  2. Choose mode/options: switch format, rules or processing as needed.
  3. Live output: results appear instantly — nothing is submitted, data stays in your browser.
  4. One-click copy: copy the output straight into your development environment.

Key Points

  • User-Agent Parser is a free online developer tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Browser/OS/device · bot detection.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

User-Agent Parser formula

User-Agent Parser uses standard developer formulas to compute accurate results instantly.

FAQ

How do I use the User-Agent Parser?
Open the page and fill in the input fields — results update automatically. Browser/OS/device · bot detection.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. User-Agent Parser[EB/OL]. https://www.yijiansuan.com/en/c/dev/ua-parser

Results provided by this tool are for reference only and do not constitute professional advice.