The Canvas element is part of HTML5 and allows scripting languages to dynamically render bitmap images. With JavaScript, it is possible to draw on this element, with common applications including graphics and text rendering, image processing, game development, and animation creation.

Each device's hardware and browser environment are unique, such as graphics cards, operating systems, and browser versions, resulting in different Canvas hash values.

In the SupLogin client, selecting "Random" allows each browser on the same computer to generate a unique Canvas. Selecting "Close" will have each browser use the computer's default Canvas settings.