DevOps & Dev Utilities

Browser & Device Inspector

See exactly what information your own browser is exposing about your device — screen, hardware, timezone, and network.

Free & unlimitedRuns in your browserNo sign-up required

This information is read from your browser's JavaScript APIs. None of it is transmitted to any server.

Browser and Device Detection APIs

Modern browsers expose a wealth of device and environment information through JavaScript APIs, enabling developers to build responsive, context-aware web applications.

Screen vs. viewport dimensions

Screen resolution (screen.width × screen.height) represents the physical display resolution, while the viewport (window.innerWidth × window.innerHeight) is the browser's content area excluding toolbars. The device pixel ratio (window.devicePixelRatio) determines how many physical pixels correspond to one CSS pixel — HiDPI/Retina screens have a ratio of 2 or higher.

Device Pixel Ratio and image sizing

On a 2× DPI display, a CSS 100px × 100px element maps to 200×200 physical pixels. Serving standard-resolution images to these displays results in blurry output. Use the <picture> element with srcset or CSS image-set() to serve the appropriate resolution image automatically.

Network Information API

The experimental Network Information API provides estimated connection speed (downlink in Mbps) and round-trip time. Applications can use this data to adaptively serve lower-quality media to users on slow connections. However, browser support varies and privacy considerations may limit availability.

Privacy and fingerprinting

Combining device information signals (screen size, timezone, language, touch points, CPU cores) creates a unique device fingerprint that can track users across browsing sessions even without cookies. Privacy-focused browsers (Tor, Brave) deliberately report common default values to reduce fingerprint uniqueness.

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How it works

Three steps, no setup

Open the page

Detection runs automatically using standard browser APIs.

Review the exposed data

Screen resolution, viewport, CPU cores, memory, and timezone are all listed.

Check your connection info

See the reported network type where your browser makes it available.

Common questions

Frequently asked questions

Is any of this sent anywhere?

No, everything shown is read directly by your own browser and displayed locally — nothing is transmitted.

Why is memory or CPU info missing?

Some of these APIs are only available in Chromium-based browsers, or may be restricted depending on your browser's privacy settings.

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DevOps & Dev Utilities

Browser & Device Inspector

Browser and Device Detection APIs

Screen vs. viewport dimensions

Device Pixel Ratio and image sizing

Network Information API

Privacy and fingerprinting

Three steps, no setup

Open the page

Review the exposed data

Check your connection info

Frequently asked questions

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Browser and Device Detection APIs

Screen vs. viewport dimensions

Device Pixel Ratio and image sizing

Network Information API

Privacy and fingerprinting