Browser UA Query

Tool Guide

About the Browser and Device Info UserAgent Lookup Tool

The online browser and device info UserAgent lookup tool queries and parses the current client's UserAgent string in real time, helping users understand information such as the browser name and version, operating system, and rendering engine.

This tool provides both server-side and client-side reading modes. Usually the UserAgent information read by both is consistent; if there is a difference, it may involve a proxy, CDN, or middle-layer modification.

How to Use the Online UserAgent Lookup Tool

Step 1: Automatic detection on page open—after visiting this tool's page, the system automatically collects the current device's UserAgent information with no manual operation needed.

Step 2: View the UserAgent details—the page displays the server-side read value and the client-side read value, making it easy to compare.

Step 3: Analyze browser and device information—from the read UserAgent string, you can analyze detailed information such as the browser version, operating system type, and rendering engine.

Step 4: Copy and use—supports copying the UserAgent result with one click, convenient for testing, development, logging, and other scenarios.

What Is a Browser UserAgent?

The UserAgent (UA for short) is a piece of identifying information sent by the browser to the server when visiting a website. It contains basic information such as the browser version, operating system, and device type.

Understanding and querying the UserAgent can help: websites optimize browser compatibility, adjust responsive layouts for different devices, perform security detection and anti-crawler identification, and identify proxy or spoofed device information.

Browser UA Info Lookup FAQ

Why are the UserAgents read by the server side and client side inconsistent?

Possible reasons include: proxy servers, CDN relaying, browser plugin modifications, and reverse proxy policies, which cause the UserAgent received by the server to be altered.

Can the UserAgent be forged?

Yes. Through browser plugins or developer tools, the UserAgent can be manually modified, but this tool can help identify such spoofing.

Is querying the UserAgent safe? Is data saved?

Completely safe. This tool only temporarily reads and displays the UserAgent information, and does not save or upload it, protecting user privacy.

Can it detect the UserAgent of mobile devices?

Of course. Whether it is a PC browser, Android phone, iPhone, iPad, or other mobile device, it can accurately detect and parse the UserAgent information.

Which users is this tool suitable for?

It is suitable for website developers, test engineers, network security personnel, SEO specialists, and any ordinary user who needs to understand their own browser or device information.