chijete / crafyimagecompressjs

In-browser javascript image compression library (GIF, JPG, PNG, WEBP)

CrafyImageCompressJS

In-browser javascript image compression and resizing library with support for static images (JPG, PNG, WEBP) and animated GIFs, with and without transparency.

• Resize image with maximum width and maximum height.
• Compress image quality to reduce size.

Principal class CrafyImageCompressJS it's inside CrafyImageCompressJS.js file.

Installation

Download CrafyImageCompressJS.js and gif.worker.js (more info in Class Reference section).

  <script src="./CrafyImageCompressJS.js"></script>

Class Reference

Create new instance of class.

  new CrafyImageCompressJS(image, image_type)

Parameter	Type	Description
image	blob	Required. Image Blob (PNG, JPG, WEBP, GIF)
image_type	string	Required. Image mime type (example: "image/png")
gifjs_workerScript_url	string	Optional. gif.js workerScript URL (link to gif.worker.js file)

Returns: true.

Compress the image.

  compressImage(quality, maxWidth, maxHeight)

Parameter	Type	Description
quality	float	Required. Target quality from 0 to 1 (0 is lower quality and 1 is better quality, example: 0.6).
maxWidth	float	Optional. Result image maximum width in pixels.
maxHeight	float	Optional. Result image maximum height in pixels.
maxWidthForGIF	float	Optional. Result image maximum width in pixels (only for GIFs).
maxHeightForGIF	float	Optional. Result image maximum height in pixels (only for GIFs).

Returns: Blob Image ("image/gif" for GIF input, "image/webp" for everyone else).