See your screen resolution, browser window size, pixel density, refresh rate and the details your browser exposes about your device. Everything is read inside your browser - none of it is sent anywhere.
Screen resolution-
Browser window (viewport)-updates as you resize
Refresh ratemeasuring...
Display
Browser & system
Hardware & network
Some values (device memory, network type, battery) are only provided by Chromium-based browsers; others are hidden by Firefox and Safari for privacy, so they show "not available".