Screen Size & DPI Tester — Funthos Tools

Measurements

Device Pixel Ratio

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Color Depth

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Screen (CSS px)

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Viewport (CSS px)

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Estimated Refresh

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Zoom (est.)

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px / mm

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px / inch

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PPI (device)

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Physical Width

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Physical Height

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Diagonal

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Ruler accuracy improves after calibration.

Not calibrated

Calibration is saved to this browser only.

Shortcuts: F toggle fullscreen • ←/→ switch pattern • Esc exit

100×100 CSS px square → device px

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100×100

Use patterns to find dead pixels (solid colors), check uniformity (gray/gradient), and sharpness (checker/lines).