Washer is a lightweight application for the Windows operating system that resembles software magnifying glasses with the difference that it is not magnifying the text but converting the colors to greyscale. It displays a window with a see through rectangle that will turn colors in the rectangle into grey making it easier for the eye to read. The window can be dragged around on the screen with the color conversion being instantly.

The program has been designed for ease of use. It can be used right after startup and the only options available are to switch to color mode and to exit the software program. The main problem that some users might run into is the fact that the window of the program cannot be resized. It will always use the same size which looks to be in the region of 4xx to 3xx. This usually means that the user has to move the window fairly regular around on the computer monitor as most websites and applications make use of a larger area to display their information.