What Can Websites See About Your Device?
A practical guide to the browser, screen, GPU, memory, permission, and network signals a normal website can read from your device.
Websites cannot freely inspect every file or hardware part on your device, but a normal browser still exposes useful compatibility signals. These include your browser name, operating system family, screen size, language, time zone, touch support, WebGL renderer, permission states, and approximate hardware buckets such as memory or CPU cores. The device info tool shows these values in one place so you can separate real device facts from browser-provided estimates.
How to test
Open the device info page in your everyday browser. Then repeat the same page in another browser, a private window, and a mobile connection if you have one. Compare the user agent, screen, GPU, memory, storage, and permission values. Values that change between browsers usually come from the browser layer, not from a physical hardware scan.
How to read the result
Exact values are usually network or browser identity signals, such as the public IP visible to the site or the browser family reported by the user agent. Approximate values are intentionally coarse. For example, device memory is commonly reported in buckets, and storage quota is a browser-managed allowance, not a direct disk size reading.
Limitations
Modern browsers reduce precision to protect privacy. Safari, Firefox, Chrome, and Edge can report different levels of detail. Extensions and privacy modes can also change what is visible. WhatsMyDevice reports what this site can see; it does not claim that every website receives the same values in every context.
What you can do
Review site permissions, keep your browser updated, remove extensions you do not trust, and use separate profiles for sensitive browsing. If a value looks surprising, test it in another browser before assuming your device is exposing private hardware details.
FAQ
Can a website see my exact device model? Usually no. Browsers often expose a broad platform or device family, not the exact model.
Is a visible GPU name dangerous? Not by itself. It is one fingerprinting signal among many.
Why do some values show as unavailable? The browser may not support that API, or it may block the value for privacy.