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HTML Canvas Fill and Stroke


Canvas Fill and Stroke

To define fill-color and outline-color for shapes/objects in canvas, we use the following properties:

Property Description
fillStyle Defines the fill-color of the object/shape
strokeStyle Defines the color of the outline of the object/shape

The fillStyle Property

The fillStyle property defines the fill-color of the object.

The fillStyle property value can be a color (colorname, RGB, HEX, HSL), a gradient or a pattern.

Example

Sorry, your browser does not support canvas.

Set the fill-color to "green" and draw a filled rectangle with the fillRect() method:

<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.fillStyle = "green";
ctx.fillRect(10,10, 100,100);
</script>
Try it Yourself »


The strokeStyle Property

The strokeStyle property defines the color of the outline.

The strokeStyle property value can be a color (colorname, RGB, HEX, HSL), a gradient or a pattern.

Example

Sorry, your browser does not support canvas.

Set the outline-color to "blue" and draw an outlined rectangle with the strokeRect() method:

<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.strokeStyle = "blue";
ctx.lineWidth = 5;
ctx.strokeRect(10,10, 100,100);
</script>
Try it Yourself »

Combining fillStyle and strokeStyle

It is perfectly legal to combine the two rectangles above.

Example

Sorry, your browser does not support canvas.
<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

// the filled rectangle
ctx.fillStyle = "green";
ctx.fillRect(10,10, 100,100);

// the outline rectangle
ctx.strokeStyle = "blue";
ctx.lineWidth = 5;
ctx.strokeRect(10,10, 100,100);
</script>
Try it Yourself »

fillStyle and strokeStyle with Alpha Channel

You can also add an alpha channel to both the fillStyle and the strokeStyle properties to create opacity.

Example

Sorry, your browser does not support canvas.

Set the opacity to 50% for both the fillStyle and strokeStyle properties:

<script>
const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

// the filled rectangle
ctx.fillStyle = "rgb(0 255 0 / 50%)";
ctx.fillRect(10,10, 100,100);

// the outline rectangle
ctx.strokeStyle = "rgb(0 0 255 / 50%)";
ctx.lineWidth = 5;
ctx.strokeRect(10,10, 100,100);
</script>
Try it Yourself »

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