User-Agent Checker
Show your browser user-agent string and related flags.
The User-Agent Checker tool provides an instant snapshot of how your web browser identifies itself to websites. Every time you visit a webpage, your browser sends a user-agent string, which is a unique identifier containing details like your operating system, browser name, version, and device type. This tool captures that exact string as seen from your current connection and breaks it down into easily understandable components and flags.
Developers frequently use the User-Agent Checker to debug website rendering issues or verify specific browser compatibility. For instance, if a website behaves differently on your machine compared to a client's, checking the user-agent string can quickly reveal discrepancies in browser versions or environments. QA testers can use it to ensure their test environments are accurately mimicking target user configurations. Even privacy-conscious individuals can gain insight into the amount of identifying information their browser voluntarily broadcasts.
The tool's output typically includes the raw user-agent string, alongside parsed elements such as OS name, OS version, browser name, browser version, engine, engine version, and various platform flags (e.g., mobile, desktop, bot). A key tip is to remember that user-agent strings can be spoofed by browser extensions, so while this tool shows your current browser's string, it doesn't guarantee a website is seeing the true default string if you have such extensions active. It simply reflects what your browser is currently sending.
How to use User-Agent Checker
Open User-Agent Checker
Simply navigate to the User-Agent Checker tool page on Tool World to begin.
View Instant Results
Your browser's current user-agent string will be automatically detected and displayed immediately upon page load.
Examine Parsed Details
Review the breakdown of your user-agent, which includes your operating system, browser name, version, and device-specific flags.
Identify Browser Signature
Use the presented data to understand how your specific browser instance is identified across the web, aiding in diagnostics or privacy awareness.
Frequently Asked Questions
What exactly is a user-agent string?
A user-agent string is a text string sent by your web browser (or any client application) to a web server as part of an HTTP request. It identifies the application, operating system, vendor, and/or version of the requesting client.
Can the User-Agent Checker detect all possible browser details?
The tool accurately displays the user-agent string your browser is currently sending. While this string contains core identification, it won't reveal deeply embedded system information or personal data not included in the standard user-agent format.
Why would my user-agent string look different from someone else's with the same browser?
Even with the same browser, differences in operating system, its version, specific browser updates, or installed extensions can alter the user-agent string. Mobile versus desktop access also generates vastly different strings.
Is it possible for a website to see a different user-agent than what this tool shows?
Yes, if you use a browser extension that specifically modifies or "spoofs" your user-agent string, then the User-Agent Checker will show the spoofed string, which is what websites would also see.
Does this tool store my user-agent string or any personal data?
No, the User-Agent Checker processes your browser's user-agent string client-side and does not store this information. Your data remains private and is not logged or transmitted to our servers.