Device Info Checker (browser, OS, hardware, network)

What's collected

Browser & OS: user-agent, parsed browser/OS, language, timezone, cookies, online status. Same info any website you visit can read.

Display: screen size, viewport size, color depth, devicePixelRatio (Retina/HiDPI), prefers-color-scheme, prefers-reduced-motion. Used by sites for responsive design and accessibility.

Hardware: CPU thread count (navigator.hardwareConcurrency), device memory class (navigator.deviceMemory, in GB, ≥4 reports clipped to 8), max touch points, GPU info from WebGL, storage quota and current usage.

Network: connection effective type (slow-2g/2g/3g/4g), downlink (Mbps), and round-trip time (ms) when supported by the browser. Useful for adaptive loading.

Privacy: what websites see vs. don't

Everything shown here is information any website you visit can already access via standard JavaScript APIs. There's no special permission needed; it's all in the public navigator and screen objects. So this tool is informational, not extractive.

What websites do NOT see (and this tool cannot show): your IP address (server-side only, this tool is fully client-side), your local file system, other browser tabs' content, or anything outside the browser sandbox. Browser fingerprinting combines many of these visible fields to identify a unique browser, even without cookies — a privacy concern documented widely.

Useful for debugging

Mobile vs desktop testing: the user agent reveals what the site sees. Sometimes responsive issues come from misdetected device class.

GPU/WebGL: 'GPU (WebGL)' shows your graphics renderer. Useful when complex 3D or canvas-heavy sites perform poorly — your GPU may be the bottleneck.

Storage: storage quota tells you how much localStorage/IndexedDB/cache the site can use. Default is typically several GBs on desktop, less on mobile. If a web app is hitting 'quota exceeded', this number is why.