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User-Agent Parser

· Last updated：2025-09-25

Parse and analyze User-Agent strings to extract browser, operating system, device, and engine information

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Written by the Elysia Tools team
Parse31
Parser23

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Development
Input types
text, checkbox
Output type
html
Sample coverage
4
API ready
Yes

Overview

The User-Agent Parser decodes complex browser identification strings into readable components, allowing you to instantly identify the browser, operating system, device type, and rendering engine associated with a specific request.

When to use

  • When you need to troubleshoot why a website layout or feature appears differently across devices.
  • When you are manually testing how your web application identifies specific browsers or mobile devices.
  • When you need to confirm the exact version of a browser or OS being reported by a client.

How it works

  1. 1Paste the raw User-Agent string into the 'User-Agent String' field.
  2. 2Toggle 'Detailed Output' if you require granular information about the rendering engine or specific version numbers.
  3. 3Submit the form to process the string.
  4. 4Review the generated HTML output to verify the extracted device, OS, and browser details.

Use cases

  • Validating that your web server's logging or analytics logic is correctly capturing client information.
  • Comparing User-Agent strings from different browsers to understand how they distinguish themselves to servers.
  • Quickly checking if a specific browser version is correctly identified by your application's detection logic.

Compare alternatives

  • Provides similar parsing capabilities but returns results in JSON format instead of HTML.

Who it's for

Best for

  • Identifying the browser and operating system from a raw User-Agent string
  • Debugging web compatibility issues by inspecting device and engine details
  • Quickly verifying what information a client browser is sending to your server

Not ideal for

  • Bulk processing of thousands of log files
  • Real-time bot traffic filtering or blocking

Edge cases & common failures

  • Obfuscated or custom User-Agent strings

    Highly modified or non-standard strings may result in incomplete or generic identification.

  • Empty or malformed input

    Empty input is rejected by validation. Non-standard or truncated strings return Unknown/default fields instead of throwing.

API & automation

  • Batch jobs

    Call POST https://api.elysiatools.com/en/api/tools/user-agent-parser with your input and get the same result without opening the page — copy-paste curl, fetch and Python examples are on the tool's docs page.

  • AI agents

    Hand an AI agent the machine-readable spec at /ai/en/tools/user-agent-parser.md or connect it through the MCP config on the docs page, and it can call this tool for you.

  • Pipelines & scheduled jobs

    Pipe input straight from a script with the fetch or Python example on the docs page and run the same job on a schedule.

· General API documentation · AI-readable spec (.md)

Examples

1. Identifying a Chrome Browser Session

Background

A developer is investigating a rendering issue reported by a user on a Windows machine.

Problem

The developer needs to confirm the exact browser version and OS reported by the user's browser.

How to use

Paste the user's User-Agent string into the input field and run the parser.

userAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36, detailedOutput: true

Outcome

The tool returns a breakdown confirming the user is on Windows 10 using Chrome 119, allowing the developer to replicate the environment.

FAQ

What information does this tool extract?

It extracts the browser name and version, operating system, device type, and rendering engine.

What is the difference between standard and detailed output?

Detailed Output adds the rendering engine name and version. It does not expose additional build metadata that is absent from the User-Agent string.

Can I parse multiple User-Agent strings at once?

No, this tool is designed to parse one User-Agent string at a time.

Does it detect bots?

Yes. Common bot, crawler, and HTTP-client tokens such as Googlebot, bingbot, curl, wget, python, and java are flagged as bots.

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