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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillStyle below:

CanvasRenderingContext2D: fillStyle property - Web APIs

CanvasRenderingContext2D: fillStyle property

Baseline Widely available

The CanvasRenderingContext2D.fillStyle property of the Canvas 2D API specifies the color, gradient, or pattern to use inside shapes. The default style is #000 (black).

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

Value

One of the following:

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

Examples Changing the fill color of a shape

This example applies a blue fill color to a rectangle.

HTML

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

JavaScript

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

ctx.fillStyle = "blue";
ctx.fillRect(10, 10, 100, 100);

Result Creating multiple fill colors using loops

In this example, we use two for loops to draw a grid of rectangles, each having a different fill color. To achieve this, we use the two variables i and j to generate a unique RGB color for each square, and only modify the red and green values. (The blue channel has a fixed value.) By modifying the channels, you can generate all kinds of palettes.

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

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

for (let i = 0; i < 6; i++) {
  for (let j = 0; j < 6; j++) {
    ctx.fillStyle = `rgb(
        ${Math.floor(255 - 42.5 * i)}
        ${Math.floor(255 - 42.5 * j)}
        0)`;
    ctx.fillRect(j * 25, i * 25, 25, 25);
  }
}

The result looks like this:

Specifications Browser compatibility WebKit/Blink-specific note

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

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