Online Screen Test — Dead Pixels · Solid Color Fullscreen · Free
Swipe left / right to switch colors
Dead pixel check in 3 steps
Go fullscreen
Pick a color from the palette, press F or the button — the solid color fills the entire screen.
Check color by color
Cycle 12 colors with ← →. Look for stuck bright pixels on black, and dark pixels on white.
Judge by the standard
ISO 13406-2 Class II allows 2 bright + 2 dark pixels; ≥1 bright pixel usually qualifies for a 7-day return.
Beyond testing — from detection to verdict
8-Step Test Wizard
- Chains dead pixel → backlight → greyscale → gamut → refresh → ghosting → black level → verdict
- Built-in criteria per step: ≥1 bright pixel = return, ≥3 dark = return, IPS Glow ≠ bleed
- Finish a professional acceptance check in 20 minutes
One-Click PDF Report
- Wizard results + screen parameters compiled into a PDF with verdicts and return basis
- Generated locally in your browser — data never leaves the device
- One file for returns, second-hand deals, and records
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What we help you find
Bright / Dark / Stuck Pixels
Manufacturing defects; ≥1 bright pixel is valid return basis (ISO 13406-2 and brand policies compared on the dead pixel page).
Backlight Bleed vs IPS Glow
Corners that brighten with viewing angle are Glow (normal); fixed white patches are bleed (returnable).
Burn-in & Image Retention
OLED burn-in is permanent; temporary retention recovers. Solid-color rotation catches it early.
Fake High Refresh / Fake HDR
Unenabled high refresh, bad cables, "HDR-compatible" without local dimming — prove it with real data.