Your browser, decoded.
Everything below is detected locally from your browser's own user agent string — no input needed.
You can paste a different user agent string here to test how it parses.
No input required.
Open the page — your user agent is detected and parsed automatically.
Open the tool
Your browser's user agent is read instantly and broken down into readable parts.
Read the breakdown
Browser, operating system, device type, engine, and more — all shown in the results panel.
Test another string
Paste any user agent string into the input to see how it parses, or tap a preset chip.
Copy if needed
Use the copy button to grab a plain-text summary of the detected details.
Three groups of detail, every check.
Each result covers your browser, your system, and your environment.
Browser data
The browser you're using, its version, the engine powering it, and the rendering mode detected.
System data
The operating system, its version, whether you're on desktop, mobile, or tablet, and the CPU architecture.
Environment
Language, screen size, device pixel ratio, and the complete user agent string sent to every site.
Questions people actually ask.
The short answers — with the long ones one tap away.
What is a user agent?+
A user agent is a short string your browser sends with every request to a website. It identifies the browser, operating system, and sometimes the device type, so servers can serve the right content or format.
What does a user agent checker do?+
A user agent checker reads the user agent string your browser sends and breaks it into human-readable parts: browser name, version, operating system, device type, engine, and more.
Can I change or fake my user agent?+
Yes. Most desktop browsers let you override the user agent from developer tools or via extensions. That's useful for testing how a site behaves for different browsers, but it does not change your IP address or hide your identity.
Does my user agent reveal personal information?+
It can reveal your browser, operating system, and sometimes device model, but it does not contain your name, email, or exact location. Combined with other signals, it can contribute to fingerprinting, so privacy tools often reduce or spoof it.
Is this user agent checker free?+
Yes, it's completely free with no sign-up. Everything is detected locally in your browser — the user agent string is not stored by StudyWithSTEM.
Why does my user agent show a different browser than I expect?+
Some browsers intentionally include strings from other browsers for compatibility (for example, Chrome includes Safari and Mozilla tokens). Our parser reads the most specific, modern tokens first to give you the most accurate result.