Determine the maximum area, height, width, and custom dimensions of an HTML <canvas> element.

• 🚀 Documentation & Demo
• 🔬 Test Results

The HTML canvas element is widely supported by modern and legacy browsers, but each browser and platform combination imposes unique size limitations (see Test Results) that will render a canvas unusable when exceeded. Unfortunately, browsers do not provide a way to determine what their limitations are, nor do they provide any kind of feedback after an unusable canvas has been created. This makes working with large canvas elements a challenge, especially for applications that support a variety of browsers and platforms.

This micro-library provides the maximum area, height, and width of an HTML canvas element supported by the browser as well as the ability to test custom canvas dimensions. By collecting this information before a new canvas element is created, applications are able to reliably set canvas dimensions within the size limitations of each browser/platform.

• Determine the maximum <canvas> area, height, and width
• Test custom <canvas> dimensions
• Web worker + OffscreenCanvas support
• UMD and ES6 module available
• Lightweight (< 1k min+gzip) and dependency-free

Browser Support

Chrome 24+
Edge 12+
Firefox 26+
Safari 8+
Internet Explorer 10+

NPM

npm install canvas-size

import canvasSize from 'canvas-size';

CDN

Available on jsdelivr (below), unpkg, and other CDN services that auto-publish npm packages.

<!-- ES Module (latest v2.x.x) -->
<script
  type="module"
  src="https://cdn.jsdelivr.net/npm/canvas-size@2/dist/canvas-size.esm.min.js"
></script>

<!-- Global "canvasSize" (latest v2.x.x) -->
<script src="https://cdn.jsdelivr.net/npm/canvas-size@2"></script>

💡 Note the @ version lock in the URLs above. This prevents breaking changes in future releases from affecting your project and is therefore the safest method of loading dependencies from a CDN. When a new major version is released, you will need to manually update your CDN URLs by changing the version after the @ symbol.

See the documentation site for details.

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Thank you! 🙏🏻

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This project is licensed under the MIT License. See the LICENSE for details.

Copyright (c) John Hildenbiddle (@jhildenbiddle)