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React Native Image Resizer

A React Native module that can create scaled versions of local images (also supports the assets library on iOS). |react-native| react-native-image-resizer| | --- | --- | | ≤ 0.60 | 1.1.0 | | 0.61 | 1.2.0 |

Setup

Install the package:

React Native >= 0.60

yarn add react-native-image-resizer
cd ios && pod install

React Native <= 0.59

yarn add react-native-image-resizer
react-native link react-native-image-resizer

Android

Note: on latest versions of React Native, you may have an error during the Gradle build on Android (com.android.dex.DexException: Multiple dex files define Landroid/support/v7/appcompat/R$anim). Run cd android && ./gradlew clean to fix this.

Manual linking

Manual link information for Android: Link

Usage example

import ImageResizer from 'react-native-image-resizer';

ImageResizer.createResizedImage(path, maxWidth, maxHeight, compressFormat, quality, rotation, outputPath)
  .then(response => {
    // response.uri is the URI of the new image that can now be displayed, uploaded...
    // response.path is the path of the new image
    // response.name is the name of the new image with the extension
    // response.size is the size of the new image
  })
  .catch(err => {
    // Oops, something went wrong. Check that the filename is correct and
    // inspect err to get more details.
  });

Sample app

A basic, sample app is available in the example folder. It uses the module to resize a photo from the Camera Roll.

API

createResizedImage(
  path,
  maxWidth,
  maxHeight,
  compressFormat,
  quality,
  rotation = 0,
  outputPath,
  keepMeta = false,
  options = {}
); // Returns a Promise

The promise resolves with an object containing: path, uri, name, size (bytes), width (pixels), and height of the new file. The URI can be used directly as the source of an <Image> component.

Option	Description
path	Path of image file, or a base64 encoded image string prefixed with 'data:image/imagetype' where `imagetype` is jpeg or png.
width	Width to resize to (see `mode` for more details)
height	Height to resize to (see `mode` for more details)
compressFormat	Can be either JPEG, PNG or WEBP (android only).
quality	A number between 0 and 100. Used for the JPEG compression.
rotation	Rotation to apply to the image, in degrees, for android. On iOS, rotation is limited (and rounded) to multiples of 90 degrees.
outputPath	The resized image path. If null, resized image will be stored in cache folder. To set outputPath make sure to add option for rotation too (if no rotation is needed, just set it to 0).
keepMeta	If `true`, will attempt to preserve all file metadata/exif info, except the orientation value since the resizing also does rotation correction to the original image. Defaults to `false`, which means all metadata is lost. Note: This can only be `true` for `JPEG` images which are loaded from the file system (not Web).
options.mode	Similar to react-native Image's resizeMode: either `contain` (the default), `cover`, or `stretch`. `contain` will fit the image within `width` and `height`, preserving its ratio. `cover` preserves the aspect ratio, and makes sure the image is at least `width` wide or `height` tall. `stretch` will resize the image to exactly `width` and `height`.
options.onlyScaleDown	If `true`, will never enlarge the image, and will only make it smaller.

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