CHECKERBOARD TEST
CHOOSE SIZE
1PX is the most demanding scaling check.
2PX/4PX are easier for sharpness.
8PX/16PX help with larger displays.
PATTERN STYLE
CHOOSE STYLE
B/W gives maximum contrast.
GREY reduces eye strain.
TIP grey mode is better for longer checks.
INVERT OPTION
CHOOSE INVERT
OFF uses the normal checker order.
ON swaps light and dark squares.
KEY press I to toggle while testing.
START CHECKERBOARD
LAUNCH CONTROL
CLICK the pattern output to exit.
ESC exits overlay or fullscreen.
USES & RELATED TESTS
USES
Check monitor sharpness and pixel mapping.
Find scaling, moiré and oversharpening.
Test TV PC mode, Game mode and rendering.
TIP use browser zoom at 100%.
RELATED TESTS
HOW TO USE CHECKERBOARD TEST
BASIC USE
Choose checker size.
Choose black-white or grey style.
Press START or FULLSCREEN.
Click the screen to exit.
WHAT TO LOOK FOR
Blurred edges.
Shimmering or crawling detail.
Coloured fringes around squares.
Uneven tint in grey mode.
DEVICE TIPS & SEARCHES
DEVICE TIPS
Use browser zoom at 100%.
Use the display native resolution.
Turn off TV sharpening.
Try PC mode or Game mode.
COMMON SEARCHES
checkerboard test
monitor sharpness test
display scaling test
moire test online
SHARPNESS & SCALING GUIDE
1PX CHECKER
Most demanding pattern.
Reveals scaling instantly.
May blend on subpixel layouts.
Best at native resolution.
2PX / 4PX
Easier to inspect visually.
Useful when 1PX shimmers.
Checks edge clarity.
Good for laptop screens.
LARGE CHECKERS & GREY MODE
8PX / 16PX
Larger structure patterns.
Shows uniformity changes.
Useful for TVs and tablets.
Less harsh than 1PX.
GREY MODE
Lower contrast pattern.
Better for tint checks.
Less eye strain.
Useful on OLED panels.
MOIRÉ & SCALING
MOIRÉ
Moiré looks like waves or ripples.
It can appear when grids conflict.
It is not always panel damage.
Try different checker sizes.
SCALING
Scaling softens fine patterns.
100% zoom is important.
TV overscan can distort output.
Use native resolution.
SHARPENING & INVERT
SHARPENING
Sharpening creates halos.
Edges may look too bright.
TV processing can exaggerate grids.
Try PC or Game mode.
INVERT
Invert swaps checker polarity.
Helps compare lit pixel positions.
Useful for eye fatigue breaks.
Press I to toggle.
TROUBLESHOOTING & SAFETY
IF IT FLICKERS
Try larger checker size.
Lower display brightness.
Switch to grey mode.
Stop if uncomfortable.
FULLSCREEN ISSUES
Browsers require a user click.
START works without fullscreen.
Try FULLSCREEN after START.
ESC exits fullscreen.
OLED CARE & PRIVACY
OLED CARE
Avoid long static sessions.
Use grey mode for less stress.
Keep brightness moderate.
Do not leave pattern unattended.
PRIVACY
No file is loaded.
No upload is used.
The tool only draws CSS pattern.
Runs fully in browser.
RELATED SCREEN TOOLS
PATTERN TESTS
COLOUR TESTS
PARENT LINKS & INDEXING
PARENT LINKS
INDEXING SUMMARY
Canonical URL: /checkerboard-test/
Page purpose: checkerboard display test.
Previous: 767 Dead Pixel Test.
Next: 769 Banding Test.