User Agent String Parser

User Agent Parsing: Core Functions and Principles

Struggling to quickly identify a user's browser version, operating system, or device type from a messy User-Agent string? This tool is designed specifically to solve this pain point. It automatically parses the User-Agent string from HTTP request headers and breaks it down into structured key fields such as browser information, operating system details, and device type. The User-Agent is a part of the HTTP protocol, sent by the client (like a browser or crawler) to the server to identify its software environment. By parsing this specifically formatted string, our tool helps you quickly understand the technical background of your visitors.

Why Choose Our User Agent Parser?

• In-depth Parsing, Comprehensive Fields: It not only parses the browser name, version, and rendering engine but also identifies the operating system (name, version, platform), device type (desktop, mobile, tablet), CPU architecture, and over 20 other technical parameters.
• Convenient Operation, 1-Click Autofill: The page provides a "Use My UA" button that instantly fills in your current browser's User-Agent string, making it easy for developers to test and verify.
• Clear Results, Intuitive Structure: The parsed results are displayed in a clear table format, mapping fields to values one-to-one, allowing developers and technical staff to quickly review and analyze the data.

Tool Tutorial

1. Paste the User-Agent string you want to parse into the input box.
2. Click the "Parse" button, and the tool will process it immediately.
3. View the detailed browser, system, and device information in the results table below.

Frequently Asked Questions (FAQ)

Q: How accurate is the User Agent parsing?
A: The tool parses based on public User-Agent rule libraries, providing accurate identification for mainstream browsers and operating system versions. However, for highly customized, spoofed, or unconventional UA strings, the parsed results may have deviations or missing fields.

Q: Can a User-Agent retrieve IP and screen information?
A: No. The User-Agent string itself only contains software and hardware environment identifiers (such as browser, OS, and device type). It does not contain privacy or real-time information like IP addresses, screen resolutions, or geographic locations. That information must be obtained through other technical means.

Important Notes

Please ensure the User-Agent string you input is complete and correctly formatted; otherwise, it may affect the parsing results. The parsed results are for reference only. For critical scenarios like device compatibility testing, we recommend verifying with real devices. This tool does not store or upload the strings you enter, but please avoid pasting UAs containing sensitive internal identifiers in public. The tool does not support batch parsing or file uploads; it processes only one string at a time.

Technical Notes & Usage Suggestions

For web developers and data analysts, User-Agent parsing is foundational for device compatibility adaptation, traffic source analysis, and formulating anti-crawler strategies. A typical use case is: when website logs show abnormal traffic to a certain page, you can extract the corresponding User-Agent and parse it to determine if it comes from a specific crawler program (like a search engine spider). Please note that modern browser privacy modes or certain extensions may simplify or modify the User-Agent, causing the parsed device information to not perfectly match reality. For example, when the mobile Chrome browser uses "Request Desktop Site," its UA will include desktop system identifiers, making the parsed "device type" inaccurate. Therefore, when relying on UAs for critical business decisions, it is recommended to use them as a reference metric rather than the sole basis.