Category · 6 tools

Display Diagnostics

Free display diagnostic tools. Test for dead pixels, backlight bleed, OLED burn-in and panel uniformity before your return window closes.

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Monitor Test

Guided six-step monitor test. Check for dead pixels, stuck pixels, sub-pixel faults and uneven backlighting, then get a plain summary. Free, no install.

Finds

Dead pixels, stuck pixels, subpixel faults and uneven backlighting, in six guided steps.

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Or test one thing at a time

Dead Pixel TestFree dead pixel test for any monitor, laptop, phone or TV. Cycle through solid colours full screen and find dead or stuck pixels in under a minute.FindsPixels that stay dark or stuck on one colour, by cycling full-screen solid fields.
Backlight Bleed TestDark roomFree backlight bleed test. A pure black full screen in a dark room reveals corner glow and edge light leaks before your return window closes.FindsCorner glow and edge light leaks, on a pure black field.
Uniformity TestFree screen uniformity test using a grid of grey patches. Spot brightness falloff, tint drift and clouding across your panel in a few seconds.FindsBrightness falloff, tint drift and clouding, across a grid of grey patches.
OLED Burn-In TestFree OLED burn-in test for TVs, monitors and phones. Solid colour fields expose image retention and uneven pixel wear that normal use hides.FindsImage retention and uneven pixel wear that normal use hides.

Then, if you found something

Stuck Pixel FixerFlashesFree stuck pixel fixer that flashes colours rapidly to unstick a trapped subpixel. Shows a photosensitivity warning you must accept before it runs.FindsFrees a subpixel stuck on one colour by flashing a bounded region at it.

Read first

Pillar guideHow to Test a Monitor in 6 StepsThe written pillar for the diagnostics cluster. A complete testing sequence covering dead pixels, uniformity, backlight bleed, burn-in and colour, in the order a technician would run them.