Screen Resolution Test

How to use

1. No Start button or device permission is required. The page reads the browser's current screen, viewport, and display-context values as soon as it loads.
2. Resize the window, rotate a supported device, move the window to another display, change browser zoom or operating-system scaling, or enter Fullscreen to compare the context the browser reports.
3. Use Refresh values after a display change when you want a fresh timestamp without reloading the page. Visual viewport scale helps describe pinch-zoom context; it is not a page-zoom percentage.
4. Use Copy report to copy the current screen, viewport, DPR, estimate, orientation, color fields, fullscreen state, and observation times for QA or support notes.

What the result means

• Screen and Available screen are browser-reported CSS-pixel dimensions. Screen describes the reported display area; Available screen reflects the browser's available area after operating-system reservations.
• Inner, client, and visual viewport values describe page geometry, not the whole display. CSS screen size and viewport size can differ because browser chrome, layout, mobile UI, and zoom change what the page can see.
• DPR is the current ratio between device pixels and CSS pixels when the browser exposes a valid value. Estimated device pixels multiply the browser-reported screen CSS dimensions by DPR and round the result; the estimate is unavailable without valid inputs and can change with page zoom or display scaling.
• Visual viewport scale is a browser-reported pinch-zoom context. Page zoom can affect DPR, while pinch zoom is represented through the visual viewport and its scale; neither field is an exact zoom-percentage meter.
• Orientation, aspect ratios, browser color depth, pixel depth, and fullscreen are context fields for comparing a browser view. Color and pixel depth are browser values, not monitor bit-depth or HDR certification.
• The report is useful for responsive QA, support tickets, and remote troubleshooting. Browser APIs do not expose reliable native panel resolution, physical size, or PPI through this page.

Limitations

• The browser-reported values and device-pixel estimate do not certify native panel resolution or physical display size.
• Browser zoom, operating-system scaling, display arrangement, privacy behavior, and browser implementation can change CSS dimensions, DPR, and event timing.
• Estimated device pixels are a screen CSS-size × DPR estimate. They do not certify native panel resolution, physical monitor size, PPI, HDR, refresh rate, or touch hardware.
• A browser may update values differently when a window moves between displays. Use Refresh values and record the observation context instead of treating one snapshot as hardware telemetry.

Troubleshooting

Screen and viewport sizes are different

This is expected: Screen describes the browser-reported display area, while viewport values describe the page area inside browser chrome and visual-viewport scaling.

The estimate changes after zooming or moving the window

Page zoom can affect DPR and display scaling can change CSS geometry. Refresh values, then compare the screen CSS dimensions, DPR, visual viewport scale, and timestamp together.

The copied report is not available

Clipboard access depends on browser permission and context. Keep the current values on screen or allow clipboard access for this page and try Copy report again; no server fallback is used.

Related tools

• Refresh Rate Test

  Estimate the refresh rate reaching this browser window from requestAnimationFrame timing. Review median frame interval, timing consistency, interruptions, and repeatable local results without treating browser Hz as panel telemetry.

• Monitor Color Test

  Inspect monitor color, grayscale neutrality, near-black and near-white separation, visual gamma references, gradients, banding, and RGB clipping with locally rendered browser patterns.

• Dead Pixel Test

  Check a monitor, laptop, phone, or tablet for dark, bright, or fixed-color pixel anomalies with nine full-screen solid-color patterns. You inspect the screen; the browser cannot diagnose physical pixels.

FAQ