HTMLCanvasElement: height property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The HTMLCanvasElement.height property is a positive integer reflecting the height HTML attribute of the <canvas> element interpreted in CSS pixels. When the attribute is not specified, or if it is set to an invalid value, like a negative, the default value of 150 is used.

Setting the height property resets the entire rendering context to its default state. This includes clearing the canvas (backing buffer), resetting the current path, and resetting all properties like fillStyle and globalCompositeOperation. This reset occurs for all context types, and occurs even when setting height to its current value. To restore the previous content after changing the height, use CanvasRenderingContext2D.getImageData() and CanvasRenderingContext2D.putImageData(). Context properties must be separately tracked and restored.

This is one of the two properties, the other being HTMLCanvasElement.width, that controls the size of the canvas.

Value

A number.

Examples

Given this <canvas> element:

html

<canvas id="canvas" width="300" height="300"></canvas>

You can get the height of the canvas with the following code:

const canvas = document.getElementById("canvas");
console.log(canvas.height); // 300

Specifications

Specification
HTML # dom-canvas-height

Browser compatibility

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This page was last modified on ⁨Apr 10, 2025⁩ by MDN contributors.

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