Screen Ruler - Free Online | FunToolX
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About this tool
Screen Ruler is a free online tool. Overlay a draggable ruler to measure pixels on screen.
The page displays a ruler that can be placed horizontally or vertically. Drag the ruler to the target position, align both ends of the content to be measured, and read the scale value. Supports switching in multiple units such as centimeters, millimeters, inches, and pixels. You can adjust the length and transparency of the ruler. Some versions support dual ruler mode and measure width and height at the same time.
The principle of screen length is to calculate the correspondence between pixels and the actual length based on the DPI (Pixels per Inch) of the display. The tool will read the system DPI settings or let the user calibrate manually. Due to the different DPI of different displays, calibration with a physical ruler may be required for the first time.
Suitable for measuring the size of web page elements, the actual size of pictures on the screen, or the spacing of elements in a design draft. Although not as precise as browser developer tools, it is more intuitive and faster.
The Screen Ruler tool displays a draggable ruler on the screen, supports centimeters, inches, and pixel units, and is used to measure the size of the content on the screen.