Frequently Asked Questions
What is a User-Agent string?
A User-Agent (UA) string is a text identifier that browsers send to websites, containing information about the browser name, version, operating system, and rendering engine.
Why do websites need my browser information?
Websites use browser info to serve compatible content, fix layout issues, and provide security. This tool lets you see exactly what information your browser reveals.
Can websites detect my real location?
Websites can detect your approximate location via IP geolocation or the Geolocation API (which requires your permission). They cannot get exact GPS without permission.
What is WebGL and why does it matter?
WebGL is a JavaScript API for rendering 3D graphics in the browser. Its information (renderer, vendor) can be used for browser fingerprinting.
What is browser fingerprinting?
Browser fingerprinting combines multiple browser properties (screen size, fonts, WebGL, etc.) to create a unique identifier. It's used for tracking without cookies.
How accurate is the OS detection?
OS detection parses the User-Agent string. It's generally accurate but can be spoofed or inaccurate for uncommon browsers and spoofed UAs.
What does device pixel ratio mean?
Device pixel ratio (DPR) is the ratio of physical pixels to CSS pixels. DPR of 2 means 4 physical pixels (2×2) per CSS pixel, common on Retina/HiDPI screens.
Is my data sent to any server?
No. All detection happens locally in your browser using JavaScript APIs. No data is transmitted to any server.