Web/API/CanvasRenderingContext2D/strokeStyle

The CanvasRenderingContext2D.strokeStyle property of the Canvas 2D API specifies the color, gradient, or pattern to use for the strokes (outlines) around shapes. The default is #000 (black).

For more examples of stroke and fill styles, see Applying styles and color in the Canvas tutorial.

Syntax

ctx.strokeStyle = color;
ctx.strokeStyle = gradient;
ctx.strokeStyle = pattern;

Options

color: A DOMString parsed as CSS <color> value.
gradient: A CanvasGradient object (a linear or radial gradient).
pattern: A CanvasPattern object (a repeating image).

Examples

Changing the stroke color of a shape

This example applies a blue stroke color to a rectangle.

HTML

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

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

ctx.strokeStyle = 'blue';
ctx.strokeRect(10, 10, 100, 100);

Result

Creating multiple stroke colors using loops

In this example, we use two for loops and the arc() method to draw a grid of circles, each having a different stroke color. To achieve this, we use the two variables i and j to generate a unique RGB color for each circle, and only modify the green and blue values. (The red channel has a fixed value.)

<canvas id="canvas" width="150" height="150"></canvas>

var ctx = document.getElementById('canvas').getContext('2d');

for (let i = 0; i < 6; i++) {
  for (let j = 0; j < 6; j++) {
    ctx.strokeStyle = `rgb(
        0,
        ${Math.floor(255 - 42.5 * i)},
        ${Math.floor(255 - 42.5 * j)})`;
    ctx.beginPath();
    ctx.arc(12.5 + j * 25, 12.5 + i * 25, 10, 0, Math.PI * 2, true);
    ctx.stroke();
  }
}

The result looks like this:

Screenshot	Live sample
[[File:../../../../../../media.prod.mdn.mozit.cloud/attachments/2012/07/09/253/c4e071f91f9aa7e0d29ff8696d37a27c/Canvas_strokestyle.png\|class=internal]]

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'CanvasRenderingContext2D.strokeStyle' in that specification.	Living Standard

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`strokeStyle`	Chrome Full support Yes	Edge Full support 12	Firefox Full support 1.5	IE Full support Yes	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 4	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes

Legend

Full support: Full support

WebKit/Blink-specific note

In WebKit- and Blink-based browsers, the non-standard and deprecated method ctx.setStrokeColor() is implemented in addition to this property.

setStrokeColor(color, optional alpha);
setStrokeColor(grayLevel, optional alpha);
setStrokeColor(r, g, b, a);
setStrokeColor(c, m, y, k, a);