A square with 1 inch width and 1 inch height is shown below.
1" x 1"
DPI is based on CSS 1" size in pixels and might be inaccurate on some operating systems, notably mobile phones. You can easily check if DPI is detected correctly by measuring the black square above with a ruler. If it is different from 1" then DPI value should be adjusted accordingly. To display a square of a different size please click on one of the buttons below.