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LCD Screen Test

Run a free in-browser LCD screen test in under a minute. Pick a color tile - red, green, blue, black, white, or yellow - and the page paints that solid fill across the full viewport so a stuck pixel, a dead pixel, or backlight bleed stands out against a uniform field. No install, no account, no upload.

Last reviewed: 2026-05-20

Reviewed by FreetoolOnline editorial team

Property	Value
Format	Online tool, no install
Speed	Browser-side; output in seconds
Privacy	Files stay on-device
Implementing tool	https://freetoolonline.com/device-test-tools/lcd-test.html

Below the color tiles the page reports three live numbers about your display: the live viewport, the screen resolution the operating system advertises, and the native screen resolution that resolution multiplied by your device pixel ratio. Confirm the native number matches the spec sheet for your laptop or monitor before flagging a suspect dot, because on a hi-DPI panel one CSS pixel sits in front of several physical sub-pixels, and a stuck sub-pixel can hide between them. The readout refreshes on each load, so a fresh check is one reload away.

Last updated: May 29, 2026

Reviewed by the Free Tool Online editorial team · Tested in the current versions of Chrome, Firefox, Safari, and Edge before publishing. No account is needed to use any tool. Report a bug - we triage within 72 hours. · Last refreshed April 2026.

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Ten-plus years of web tooling. The freetoolonline editorial team has shipped browser-based utilities since 2015. The goal has never changed: get you to a working output fast, without an install.
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Open-source core components. The processing engines underneath (libheif, libde265, pdf-lib, terser, clean-css, ffmpeg.wasm, and others) are public and audit-able. We link to each one in its tool page's footer.
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