Browser Information

A user agent (UA) string is a text identifier that your browser sends to every website you visit. It typically includes the browser name and version, the rendering engine, and the operating system. Websites use it to tailor content and detect compatibility issues.

Yes. JavaScript can read your screen resolution (via screen.width/screen.height), viewport size (via window.innerWidth/innerHeight), and even the device pixel ratio. This information is commonly used for responsive design but can also be used for fingerprinting.

Canvas fingerprinting works by asking your browser to draw a hidden image or text onto an HTML5 canvas element, then reading the pixel data. Because different devices, GPUs, and browsers render slightly differently, the resulting pixel data creates a nearly unique identifier — a “fingerprint” — without using cookies. This page computes a simple hash of that data to show you the concept.

Browser detection based on the user agent string is notoriously unreliable. Browsers can spoof their UA string, and many browsers share the same engine (e.g., Chrome, Edge, and Opera all use Blink). The information on this page is parsed from the UA string and JavaScript APIs, and should be used as a general guide rather than a definitive identification.