img-scalr

A lightweight, zero-dependents javascript utility for scaling images at the client before upload using Canvas API.

Installation

npm install img-scalr
# or
yarn add img-scalr

Usage

import ImgScalr from 'img-scalr'

const dataURL = await ImgScalr.scale(
    imgFile,
    { width: 400, height: 400 },
    ImgScalr.DataURL,
    'image/png'
  )

API

scale(imageFile, targetSize, resultType, mimeType) : Promise<String|Blob>

scales imageFile proportionally with respect to targetSize.

• imageFile - Image file object to scale.
• targetSize - target width and height. Output image will not exceed these bounds
• resultType - (Optional) desired return type. Defaults to DataURL if not specified.
  • ResultType.DataURL - Returns an image that you can use as source to another canvas or an HTML Element.
  • ResultType.Blob - returns a Blob object representing the image; this file may be cached on the disk or stored in memory at the discretion of the user agent.
• mimeType - (Optional) A DOMString indicating the image format. If not specified, the image type is image/png. The created image is in a resolution of 96dpi.

Browser Support

Should work in all browsers that supports canvas