CanvasRenderingContext2D: lineWidth property

The CanvasRenderingContext2D.lineWidth property of the Canvas 2D API sets the thickness of lines.

Note: Lines can be drawn with the stroke(), strokeRect(), and strokeText() methods.

Value

A number specifying the line width, in coordinate space units. Zero, negative, Infinity, and NaN values are ignored. This value is 1.0 by default.

Examples

Changing line width

This example draws a line and a rectangle, using a line width of 15 units.

HTML

html

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

JavaScript

js

const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

ctx.lineWidth = 15;

ctx.beginPath();
ctx.moveTo(20, 20);
ctx.lineTo(130, 130);
ctx.rect(40, 40, 70, 70);
ctx.stroke();

Result

More examples

For more examples and explanation about this property, see Applying styles and color in the Canvas Tutorial.

Specifications

Specification
HTML Standard
# dom-context-2d-linewidth-dev

Browser compatibility

BCD tables only load in the browser

See also