JavaScript GIF encoder that runs in your browser.
Uses typed arrays and web workers to render each frame in the background, it's really fast!
Demo - http://jnordberg.github.io/gif.js/
Works in browsers supporting: Web Workers, File API and Typed Arrays
Tested in
- Google Chrome
- Firefox 17
- Safari 6
- Internet Explorer 10
- Mobile Safari iOS 6
Include gif.js found in dist/ in your page. Also make sure to have gif.worker.js in the same location.
var gif = new GIF({
workers: 2,
quality: 10
});
// add a image element
gif.addFrame(imageElement);
// or a canvas element
gif.addFrame(canvasElement, {delay: 200});
// or copy the pixels from a canvas context
gif.addFrame(ctx, {copy: true});
gif.on('finished', function(blob) {
window.open(URL.createObjectURL(blob));
});
gif.render();Options can be passed to the constructor or using the setOptions method.
| Name | Default | Description |
|---|---|---|
| repeat | 0 |
repeat count, -1 = no repeat, 0 = forever |
| quality | 10 |
pixel sample interval, lower is better |
| workers | 2 |
number of web workers to spawn |
| workerScript | gif.worker.js |
url to load worker script from |
| background | #fff |
background color where source image is transparent |
| width | null |
output image width |
| height | null |
output image height |
| transparent | null |
transparent hex color, 0x00FF00 = green |
If width or height is null image size will be deteremined by first frame added.
| Name | Default | Description |
|---|---|---|
| delay | 500 |
frame delay |
| copy | false |
copy the pixel data |
If you want to contribute, here's some stuff that would be nice to have.
- Tests
- Fallbacks and polyfills for old browsers
- Dithering!
gif.js is based on:
- Kevin Weiner's Animated gif encoder classes
- Neural-Net color quantization algorithm by Anthony Dekker
- Thibault Imbert's as3gif
The MIT License (MIT)
Copyright (c) 2013 Johan Nordberg
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.