Fix Canvas Height

The HTML canvas element, driven by JavaScript, provides a powerful platform for creating graphics dynamically in a web page. However, sometimes you may encounter issues with the canvas height that need to be resolved to ensure your graphics display correctly. In this blog post, we’ll look into how to fix canvas height in JavaScript properly.

Understanding the Canvas Element

The canvas element in HTML is a container for graphics that are drawn via scripting (usually JavaScript). The element has two size attributes: width and height, which defaults to 300 pixels wide and 150 pixels high. These attributes set the size of the canvas grid, not the actual displayed size of the canvas.

Fixing Canvas Height

There can be instances where your canvas height doesn’t adapt or fit as per your requirements. The canvas might be too small or too large for your purpose. In such cases, you need to fix your canvas height. This can be done simply by directly setting the height attribute of the canvas element, either in your HTML or your JavaScript.

Setting Canvas Height in HTML

The height of the canvas can be directly set in the HTML using the ‘height’ attribute. Here’s a simple example:

<canvas id="myCanvas" width="500" height="300">
Your browser does not support the HTML canvas tag.

In the above example, the canvas will have a width of 500 pixels and a height of 300 pixels.

Setting Canvas Height in JavaScript

To dynamically adjust the canvas height in JavaScript, you can use the ‘height’ property of the canvas element. Here is how you can do it:

let canvas = document.getElementById('myCanvas');
canvas.height = 300;

In the above snippet, we first select the canvas with the id ‘myCanvas’, and then set its height to 300 pixels using the ‘height’ property.


Fixing the height of a canvas in JavaScript or HTML is quite straightforward. It’s all about understanding the canvas element and its properties and making the appropriate adjustments. However, always remember to consider the aspect ratio of your canvas to avoid distorted drawings and keep your design responsive.