Free Online Screen Ruler
Free online Screen Ruler. Runs locally in your browser with zero uploads for privacy and speed.
Measurement Result
ΔX：380 px
ΔY：200 px
Width: 380 px
Height: 200 px
Distance: 429.42 px
Not calibrated: only pixel values are shown. Switch to Calibrate to convert to centimeters or inches.
Tip: Drag points A/B to measure. When A and B overlap, hitting both points moves the whole selection.
Calibration (Optional)
Align the distance between A and B to a known physical length, then enter that length in millimeters and save.
Current Distance
429.42 px
Suggestion: calibrate with a bank card width (85.6mm) or 10cm on a physical ruler. Fullscreen can improve accuracy.