The CanvasRenderingContext2D.fillRect() method of the Canvas 2D API draws a rectangle that is filled according to the current fillStyle.

This method draws directly to the canvas without modifying the current path, so any subsequent fill() or stroke() calls will have no effect on it.


void ctx.fillRect(x, y, width, height);

The fillRect() method draws a filled rectangle whose starting point is at (x, y) and whose size is specified by width and height. The fill style is determined by the current fillStyle attribute.


The x-axis coordinate of the rectangle's starting point.
The y-axis coordinate of the rectangle's starting point.
The rectangle's width. Positive values are to the right, and negative to the left.
The rectangle's height. Positive values are down, and negative are up.


A simple filled rectangle

This example draws a filled green rectangle using the fillRect() method.


<canvas id="canvas"></canvas>


The rectangle's top-left corner is at (20, 10). It has a width of 150 and a height of 100.

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.fillStyle = 'green';
ctx.fillRect(20, 10, 150, 100);


Filling the whole canvas

This code snippet fills the entire canvas with a rectangle. This is often useful for creating a background, on top of which other things may then be drawn. To achieve this, the dimensions of the rectangle are set to equal the <canvas> element's width and height attributes.

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.fillRect(0, 0, canvas.width, canvas.height);


Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.fillRect' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
fillRectChrome Full support 1Edge Full support 12Firefox Full support 1.5IE Full support 9Opera Full support 9Safari Full support 2WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0


Full support  
Full support

See also