GEARCHECK LABUse a steady grid, central circle and four labelled corners to inspect stretching or cropped edges. This is useful when a television or external monitor applies a picture-size or overscan setting.
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The circle should look round if the output is displayed without unequal horizontal or vertical stretching. Equal CSS grid spacing should look square on a normally mapped output. Missing corner markers can suggest cropping, but you must first rule out a browser window or fullscreen issue. The dimensions shown describe CSS-pixel space available to the page; they are not a direct reading of the panel’s physical pixel count.
An embedded 16:9 pattern is deliberately letterboxed or sized inside a web page and is not itself evidence of an incorrect monitor ratio. Browser fullscreen, operating-system scaling, display mirroring and video adapters can alter the available area. This tool cannot change a television’s overscan setting or certify panel geometry. Compare a native-resolution desktop and manufacturer picture controls before deciding that hardware is faulty.
It is constrained by the chosen aspect ratio and page layout. Use fullscreen to inspect the page’s available output area, then compare the display’s own picture-size controls.
Diagnostic data is processed locally in this tab and is not intentionally sent to analytics. Network tools send only their test probes and temporary payloads to GearCheck Lab’s speed-test server. Media and device access starts only after your explicit action and any required browser permission. Downloaded results stay on your device.
Read the privacy policy and testing methodology. If something fails, report the tool URL and visible message.