How to change the opacity (alpha, transparency) of an element in a canvas element with JavaScript?

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Sometimes, we want to change the opacity (alpha, transparency) of an element in a canvas element with JavaScript.

In this article, we’ll look at how to change the opacity (alpha, transparency) of an element in a canvas element with JavaScript.

How to change the opacity (alpha, transparency) of an element in a canvas element with JavaScript?

To change the opacity (alpha, transparency) of an element in a canvas element with JavaScript, we set the fillStyle of the canvas.

For instance, we write

ctx.fillStyle = "rgba(255, 255, 255, 0.5)";

to set the fillStyle of the canvas to the baackground color with the transparency value.

Conclusion

To change the opacity (alpha, transparency) of an element in a canvas element with JavaScript, we set the fillStyle of the canvas.

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