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Measure distances on screenshots
ScreenRuler is a precise on-screen measurement tool with DPI calibration. Measure in pixels, cm, inches, or mm. Use Line, Rectangle, Circle, Diagonal, or Angle tools. Calibrate with a credit card or ruler for physical accuracy.
Click the ๐ง button next to DPI input. Place a credit card, ruler, or coin against your screen and adjust the slider until the on-screen ruler matches the physical object.
The Diagonal tool draws a line between two points and shows width, height, and diagonal distance simultaneously with dimension lines โ perfect for measuring screen elements at angles.
Yes! ScreenRuler is completely free with no signup required. Your data stays in your browser.