Screen Ruler - Free Online | ToolXHub

The page displays a ruler that can be placed horizontally or vertically. Drag the ruler to the target position, align the 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 both width and height.

The principle of screen length is to calculate the correspondence between pixels and actual length based on the DPI (number of pixels per inch) of the display. The tool will read the system DPI settings or allow the user to manually calibrate it. Due to the different DPI of different displays, calibration using a physical ruler for the first time may be necessary.

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 development tools, it is more intuitive and faster.

The Screen Ruler tool displays a draggable ruler on the screen, supporting centimeters, inches, and pixel units, and is used to measure the size of content on the screen.