Calibration
Detecting your device…
Device not recognised. Try the Device tab to pick from our list, or use Diagonal / Credit card.
Select your device to set the exact factory PPI.
Enter your screen's diagonal size. You can find it in device specs or printed on the box.
Calculated PPI:
Place a standard credit/debit card flat on your screen. Drag the slider until the blue bar matches the card width exactly.
← ISO standard card width: 85.60 mm →
Active PPI:
Browser zoom ≠ 100%. Press Cmd+0/Ctrl+0 then recalibrate.