How to Use This Tool
Your own browser's user-agent string is detected and displayed automatically the moment the page loads, so you can see what a website sees when you visit it. To inspect a different user-agent — say, one pulled from server logs or an analytics report — paste it into the input box and click "Parse." The tool breaks it down into readable fields: browser name and version, rendering engine, operating system, and device type (desktop, mobile, or tablet). This is useful for developers debugging why a site renders differently for certain visitors, QA testers verifying device-specific behavior, and anyone reviewing server logs who needs to quickly identify what's really behind a raw user-agent string without memorizing the format.
Frequently Asked Questions
What is a User-Agent string?
A User-Agent string is a line of text that a web browser sends to a web server, identifying the browser type, version, operating system, and device being used.
What is a User-Agent parser used for?
A User-Agent parser breaks down the complex User-Agent string into readable data, helping developers analyze web traffic, optimize layouts for specific devices, and troubleshoot compatibility issues.
Can a User-Agent string be spoofed?
Yes, users and bots can easily modify or 'spoof' their User-Agent strings to masquerade as a different browser or device for testing, privacy, or malicious purposes.
What data can be extracted from a User-Agent?
Typical data extracted includes the browser name and version, rendering engine, operating system, device type (mobile, tablet, desktop), and sometimes CPU architecture.
Why does a website need to know my device and browser?
Websites use this information to serve the most compatible version of their site, ensure features function correctly, and gather analytics on their user base.