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Screen Test
A set of free display tests for monitors, laptops, phones, tablets and TVs. Start with the two-minute quick check, or pick a test for the problem you’re chasing.
Quick check
Two-minute screen check
Eight fullscreen patterns in a row, each with a short note telling you what to look for. Good for a new or second-hand screen.
How to use
How to use the quick check
- Clean the screen, set brightness to your usual level and turn off night mode.
- Press Start quick check. Each of the eight patterns shows a short note at the top saying what to look for.
- Move on by tapping or pressing → once you’ve checked each pattern.
- Note anything odd, then open the matching full test from the list below for a closer look.
Controls
- Tap / click
- Next pattern.
- → ←
- Next or previous pattern.
- Esc / Exit
- Stop the check.
All tests
Pick a test
- Touch Screen TestDraw, fill a coverage grid and count simultaneous touches.
- Dead Pixel TestFullscreen black, white, red, green and blue to spot faulty pixels.
- Refresh Rate TestSee the Hz your browser is drawing at, with a live frame-time graph.
- Ghosting TestMoving targets at set speeds to judge motion blur and trailing.
- Screen Color TestSolid colors, grayscale steps and gradients for uniformity and banding.
- Backlight Bleed TestDark screens for spotting light leaking from the edges of an LCD.
- Burn-In TestEven gray and color fields to reveal OLED burn-in and image retention.
Which test?
Match the test to the problem
Screen doesn’t respond in places
Use the touch screen test to map dead zones and check multi-touch.
A dot that won’t go away
The dead pixel test shows whether it is a dead, stuck or bright pixel, or just dust.
Motion looks blurry or choppy
Check the refresh rate first, then compare settings with the ghosting test.
Light at the edges in dark scenes
The backlight bleed test separates bleed from IPS glow.
Faint shapes that stay on screen
The burn-in test uses even fields that make retention visible.
Colors look uneven or banded
The screen color test has solids, grayscale steps and gradients.
Buying used?
Checking a second-hand screen
Run the quick check, then the touch test for phones and tablets and the refresh rate test for gaming monitors. Ask the seller to turn brightness up and HDR or local dimming off, and look at the screen in person rather than through photos, which hide pixel faults and exaggerate bleed.
Limits
What browser tests can and can’t do
These tests show patterns and read what your browser reports. They help you look methodically, but they can’t read your display hardware, measure response time or color accuracy, or certify a screen. For warranty claims, follow your manufacturer’s own pixel and uniformity policies.