Screen Resolution & Scaling Test

Your display information

Physical screen size cannot be measured accurately by every browser. Values shown here describe browser-reported pixels and scaling.

Direct answer

What is the Resolution & Scaling Test?

Check screen resolution, viewport dimensions, scaling, pixel ratio and display information.

✓ No installation✓ Works in compatible browsers✓ Privacy-focused testing

Practical guide

Understanding resolution, scaling and device pixel ratio

A webpage is laid out in CSS pixels, while the display may contain many more physical pixels. Device pixel ratio (DPR) describes the relationship between those coordinate systems and helps explain why a high-resolution phone or Retina-class laptop can show a relatively compact browser layout.

For a more reliable result

Compare screen dimensions with viewport dimensions to see how much space the browser actually gives the page.
Check the value again after changing browser zoom or display scaling; CSS layout dimensions can change even though the panel itself does not.
Use the estimated rendered pixel dimensions as a browser calculation, not as a guaranteed factory panel specification.
For exact native resolution, confirm the display model in system settings or manufacturer documentation.

What this test cannot confirm

Browsers intentionally abstract hardware details. This tester is most useful for web-development, scaling and display-behavior checks rather than identifying an unknown monitor model.

Why two devices with the same resolution can look different

Pixel resolution alone does not determine how large interface elements appear. A 2560×1440 laptop, for example, may use a higher operating-system scale than a desktop monitor with the same pixel count. Browser zoom, display scaling and device pixel ratio all affect the CSS viewport, so compare these values together rather than treating any single number as the complete display specification.

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Complete Screen TestRun pixels, colors, uniformity, contrast, sharpness and motion in one guided check.Dead Pixel TestInspect solid colors for dead, stuck, bright or dark pixels.Touch Screen TestCheck touch coverage, dragging continuity and dead zones.Keyboard TesterTest a full-size keyboard and confirm every key press.Mouse TesterTest buttons, wheel, movement, dragging and double-clicks.Audio TesterCheck speakers, stereo channels, tones and microphone input.Camera & WebcamTest built-in, USB, phone, tablet and compatible TV cameras.Microphone TesterView microphone levels, waveform, recording and playback.Pixel ExerciserRun full-screen rapid color cycling for suspected stuck pixels.Gradient TestInspect gradients, tonal transitions and visible banding.Brightness & ContrastCheck black levels, white saturation and contrast separation.Screen Size TestView viewport, resolution, pixel ratio and display data.Text SharpnessInspect text rendering, browser scaling and clarity.Motion & GhostingObserve motion blur, ghosting and response behavior.Resolution & ScalingCheck screen resolution, CSS pixels and scaling.Device InformationReview screen, browser, hardware and platform information.Browser CapabilityCheck which browser APIs and hardware features are supported.Network TestCheck connection status, latency and estimated download speed.GPS & LocationTest browser geolocation, accuracy, altitude and speed.Sensor TesterTest orientation, motion, acceleration and rotation sensors.Multi-Touch TesterTrack multiple touch points, pinching and rotation gestures.Screen Color ToolsOpen full-screen colors with timers, lighting presets and 4K background downloads.Response Time TestObserve ghosting, blur and pixel-transition behavior at several speeds.Stylus Drawing TestCheck pen, touch, pressure, tilt and drawing continuity in your browser.