모니터 선명도 테스트
1픽셀 그리드, 텍스트 샘플, RGB 서브픽셀 자. 브라우저에서 바로 실행되며 다운로드나 가입이 필요 없습니다. 결과를 즉시 확인하고 관련 하드웨어 테스트로 이동할 수 있습니다. KeyboardTester.click is free, mobile friendly, and built for quick diagnostics.
Lagom-style sharpness patterns
Each block is a 1px alternating black/white grid drawn at the device pixel ratio. On a correctly-scaled monitor with neutral sharpness, every block should look like a uniform mid-grey at arm's length. Visible banding, moire, or shimmer means OS scaling, monitor over-sharpening, or a non-native resolution is interfering with pixel-perfect rendering.
Text clarity at 8 sizes × 3 fonts
Read each block. Small text should remain crisp, not fuzzy. The same paragraph is rendered in serif, sans, and monospace at 12-64 px so you can compare hinting, stem thickness, and grayscale anti-aliasing.
Color fringing detection
Look at the edges of each character. If you see thin red, green, or blue halos along letter strokes, that is chromatic aberration from sub-pixel anti-aliasing on a non-RGB-stripe panel (e.g. RWBG, BGR, OLED PenTile). Black-on-white and white-on-black often render with different sub-pixel hinting.
16px black on white
The quick brown fox jumps over the lazy dog. 0123456789
Sharpness
16px white on black
The quick brown fox jumps over the lazy dog. 0123456789
Sharpness
Aa Bb 0123
Aa Bb 0123
Sub-pixel layout ruler
A 1px wide repeating pattern of pure red, green, blue, and black columns. Lean in close (or use a phone camera macro). On a standard RGB-stripe LCD you should see a clean R-G-B-K stripe; on a BGR panel the order reverses; OLEDs with PenTile arrangement will look mottled. This tells you the pixel layout your monitor uses for sub-pixel anti-aliasing.
Denser RGB+black:
Solid R/G/B reference (helps identify a stuck pixel within a column):
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