What Is My Browser
Check your browser version, OS, and user-agent string.
Check Your Exact Browser Name, Version, & User Agent String
You are chatting with a software support specialist trying to fix a bug on an online banking portal, an e-commerce website, or your company's internal dashboard. Within thirty seconds, the support agent asks: "Can you please tell me what browser and exact version number you are using?"
You know you are using "Chrome" or "Safari", but where do you find the exact multi-digit build number? Is your browser up to date? Are third-party cookies blocked? Is hardware-accelerated WebGL enabled on your graphics card?
Knowing your exact browser environment is critical for web developers debugging frontend layout bugs, IT administrators enforcing enterprise security compliance, and everyday users ensuring their system is protected against web security vulnerabilities.
Our free What Is My Browser tool scans your browser environment live, displaying your exact browser name, version, underlying operating system, full User Agent string, and feature capabilities in one clear dashboard.
Why Does Every User Agent Say "Mozilla/5.0"? (A Quirky History)
When you inspect your raw User Agent string, you will notice a bizarre mystery: whether you use Google Chrome, Microsoft Edge, or Apple Safari, the string almost certainly begins with Mozilla/5.0.
The 1990s Browser War Legacy
In the early days of the web, Netscape Navigator called its browser engine Mozilla (short for Mosaic Killer) and was the first to support advanced HTML frames. Webmasters configured their servers to send rich pages only to browsers that identified as "Mozilla", sending primitive plain text to all others.
When Microsoft released Internet Explorer, it started pretending to be Mozilla so servers wouldn't reject it. Later, when Apple built Safari and Google built Chrome, they did the exact same thing to maintain backward compatibility with old web servers!
Today, every modern browser maintains this legacy disguise in its User Agent string for universal web compatibility.
Key Browser Diagnostics Checked Live
Rendering Engine:
Detects whether your browser runs on Google Blink (Chrome/Edge/Brave), Apple WebKit (Safari), or Mozilla Gecko (Firefox).
JavaScript Status:
Verifies if the V8/SpiderMonkey JavaScript runtime is actively executing scripts.
Cookie Permissions:
Checks if session cookies and first-party storage are allowed for login states.
Screen Dimensions:
Reports viewport width and physical monitor pixel resolution for responsive debugging.
Frequently Asked Questions
How do I update my browser to the latest version?
In Google Chrome or Microsoft Edge, click the three-dot menu in the top right corner, select Help, and click About Google Chrome. The browser will automatically check for and install the latest security update. On Apple Safari, updates are bundled directly into macOS and iOS system software updates.
Why is running an outdated browser dangerous?
Cybersecurity researchers regularly discover "zero-day" vulnerabilities in browser engines that allow malicious websites to execute code on your device. Updating your browser ensures you have the latest security patches against phishing and exploits.
Can I copy my User Agent string to send to tech support?
Yes, our tool provides a convenient "Copy User Agent" button so you can paste your full technical environment string directly into support chat tickets.