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ImageMinimizerWebpackPlugin

Plugin and Loader for <a href="http://webpack.js.org/">webpack</a> to optimize (compress) all images using <a href="https://github.com/imagemin/imagemin">imagemin</a>.
Do not worry about size of images, now they are always optimized/compressed.

This plugin uses imagemin to optimize your images.

Getting Started

To begin, you'll need to install image-minimizer-webpack-plugin:

$ npm install image-minimizer-webpack-plugin --save-dev

Images can be optimized in two modes:

Lossless (without loss of quality).
Lossy (with loss of quality).

Note:

imagemin-mozjpeg can be configured in lossless and lossy mode.
imagemin-svgo can be configured in lossless and lossy mode.

Explore the options to get the best result for you.

Recommended imagemin plugins for lossless optimization

npm install imagemin-gifsicle imagemin-jpegtran imagemin-optipng imagemin-svgo --save-dev

Recommended imagemin plugins for lossy optimization

npm install imagemin-gifsicle imagemin-mozjpeg imagemin-pngquant imagemin-svgo --save-dev

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: 'asset',
      },
    ],
  },
  plugins: [
    new ImageMinimizerPlugin({
      minimizerOptions: {
        // Lossless optimization with custom option
        // Feel free to experiment with options for better result for you
        plugins: [
          ['gifsicle', { interlaced: true }],
          ['jpegtran', { progressive: true }],
          ['optipng', { optimizationLevel: 5 }],
          [
            'svgo',
            {
              plugins: [
                {
                  removeViewBox: false,
                },
              ],
            },
          ],
        ],
      },
    }),
  ],
};

ℹ️ Only for 4 version of webpack: Make sure that plugin place after any plugins that add images or other assets which you want to optimized.**

ℹ️ If you want to use loader or plugin standalone see sections below, but this is not recommended.

Standalone Loader

Documentation: Using loaders

In your webpack.config.js, add the ImageMinimizerPlugin.loader and specify the asset modules options:

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: 'asset',
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              severityError: 'warning', // Ignore errors on corrupted images
              minimizerOptions: {
                plugins: ['gifsicle'],
              },
            },
          },
        ],
      },
    ],
  },
};

Standalone Plugin

Documentation: Using plugins

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: 'asset',
      },
    ],
  },
  plugins: [
    // Make sure that the plugin placed after any plugins that added images
    new ImageMinimizerPlugin({
      severityError: 'warning', // Ignore errors on corrupted images
      minimizerOptions: {
        plugins: ['gifsicle'],
      },
      // Disable `loader`
      loader: false,
    }),
  ],
};

Options

Plugin Options

Name	Type	Default	Description
`test`	`{String\/RegExp\|Array<String\|RegExp>}`	`/.(jpe?g\|png\|gif\|tif\|webp\|svg\|avif)$/i`	Test to match files against
`include`	`{String\/RegExp\|Array<String\|RegExp>}`	`undefined`	Files to `include`
`exclude`	`{String\/RegExp\|Array<String\|RegExp>}`	`undefined`	Files to `exclude`
`filter`	`{Function}`	`() => true`	Allows filtering of images for optimization
`severityError`	`{Boolean\|String}`	`'auto'`	Allows to choose how errors are displayed
`minimizerOptions`	`{Object}`	`{ plugins: [] }`	Options for `imagemin`
`loader`	`{Boolean}`	`true`	Automatically adding `imagemin-loader`
`maxConcurrency`	`{Number}`	`Math.max(1, os.cpus().length - 1)`	Maximum number of concurrency optimization processes in one time
`filename`	`{string}`	`'[path][name][ext]'`	Allows to set the filename for the generated asset. Useful for converting to a `webp`
`deleteOriginalAssets`	`{Boolean}`	`false`	Allows to delete the original asset. Useful for converting to a `webp` and remove original assets

`test`

Test to match files against.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      test: /\.(jpe?g|png|gif|svg)$/i,
    }),
  ],
};

`include`

Type: String|RegExp|Array<String|RegExp> Default: undefined

Files to include.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      include: /\/includes/,
    }),
  ],
};

`exclude`

Type: String|RegExp|Array<String|RegExp> Default: undefined

Files to exclude.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      exclude: /\/excludes/,
    }),
  ],
};

`filter`

Type: Function Default: () => true

Allows filtering of images for optimization.

Return true to optimize the image, false otherwise.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      filter: (source, sourcePath) => {
        // The `source` argument is a `Buffer` of source file
        // The `sourcePath` argument is an absolute path to source
        if (source.byteLength < 8192) {
          return false;
        }

        return true;
      },
    }),
  ],
};

`severityError`

Type: Boolean|String Default: 'auto'

Allows to choose how errors are displayed.

Сan have the following values:

'auto' - emit warnings in development mode and emit errors in production mode (default behavior)
false or 'off' - suppresses errors and warnings
'warning' - emit warnings instead errors
true or 'error' - emit errors

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      severityError: 'warning',
    }),
  ],
};

`minimizerOptions`

Type: Object Default: { plugins: [] }

Options for imagemin.

More information and examples here.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minimizerOptions: {
        plugins: [
          // Name
          'gifsicle',
          // Name with options
          ['mozjpeg', { quality: 80 }],
          // Full package name
          [
            'imagemin-svgo',
            {
              plugins: [
                {
                  removeViewBox: false,
                },
              ],
            },
          ],
          [
            // Custom package name
            'nonstandard-imagemin-package-name',
            { myOptions: true },
          ],
        ],
      },
    }),
  ],
};

`loader`

Type: Boolean Default: true

Automatically adding imagemin-loader.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      loader: false,
    }),
  ],
};

`maxConcurrency`

Type: Number Default: Math.max(1, os.cpus().length - 1)

Maximum number of concurrency optimization processes in one time.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      maxConcurrency: 3,
    }),
  ],
};

`filename`

Type: String Default: '[path][name][ext]'

Allows to set the filename for the generated asset. Useful for converting to a webp.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    // Images are converted to `webp` and the original assets have been kept
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      filename: '[path][name].webp',
      minimizerOptions: {
        plugins: ['imagemin-webp'],
      },
    }),
  ],
};

`deleteOriginalAssets`

Type: Boolean Default: false

Allows to remove original assets. Useful for converting to a webp and remove original assets

i Doesn't make sense if you haven't changed the original value of the filename option

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    // Images are converted to `webp` and the original assets have been removed
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      deleteOriginalAssets: true,
      filename: '[path][name].webp',
      minimizerOptions: {
        plugins: ['imagemin-webp'],
      },
    }),
  ],
};

To generate and compress the original assets:

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    // And the original assets will be compressed
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      minimizerOptions: {
        plugins: ['pngquant'],
      },
    }),
    // Images are converted to `webp` and the original assets have been removed
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      deleteOriginalAssets: false,
      filename: '[path][name].webp',
      minimizerOptions: {
        plugins: ['imagemin-webp'],
      },
    }),
  ],
};

Loader Options

Name	Type	Default	Description
`filter`	`{Function}`	`undefined`	Allows filtering of images for optimization
`severityError`	`{Boolean\|String}`	`'auto'`	Allows to choose how errors are displayed
`minimizerOptions`	`{Object}`	`{ plugins: [] }`	Options for `imagemin`
`filename`	`{string}`	`'[path][name][ext]'`	Allows to set the filename for the generated asset. Useful for converting to a `webp`
`deleteOriginalAssets`	`{Boolean}`	`false`	Allows to delete the original asset. Useful for converting to a `webp` and remove original assets

`filter`

Type: Function Default: () => true

Allows filtering of images for optimization.

Return true to optimize the image, false otherwise.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: 'asset',
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              cache: true,
              filter: (source, sourcePath) => {
                // The `source` argument is a `Buffer` of source file
                // The `sourcePath` argument is an absolute path to source
                if (source.byteLength < 8192) {
                  return false;
                }

                return true;
              },
              minimizerOptions: {
                plugins: ['gifsicle'],
              },
            },
          },
        ],
      },
    ],
  },
};

`severityError`

Type: Boolean|String Default: 'auto'

Allows to choose how errors are displayed.

Сan have the following values:

'auto' - emit warnings in development mode and emit errors in production mode (default behavior)
false or 'off' - suppresses errors and warnings
'warning' - emit warnings instead errors
true or 'error' - emit errors

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: 'asset',
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              severityError: 'warning',
              minimizerOptions: {
                plugins: ['gifsicle'],
              },
            },
          },
        ],
      },
    ],
  },
};

`minimizerOptions`

Type: Object Default: { plugins: [] }

Options for imagemin.

Options for imagemin

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: 'asset',
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              severityError: 'warning',
              minimizerOptions: {
                plugins: [
                  ['gifsicle', { interlaced: true, optimizationLevel: 3 }],
                ],
              },
            },
          },
        ],
      },
    ],
  },
};

`filename`

Type: String Default: '[path][name][ext]'

Allows to set the filename for the generated asset. Useful for converting to a webp.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif)$/i,
        use: [
          {
            test: /\.(jpe?g|png|gif|svg)$/i,
            type: 'asset',
          },
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              filename: '[path][name].webp',
              minimizerOptions: {
                plugins: ['imagemin-webp'],
              },
            },
          },
        ],
      },
    ],
  },
};

`deleteOriginalAssets`

Type: Boolean Default: false

Allows to keep the original asset. Useful for converting to a webp and remove original assets.

i Doesn't make sense if you haven't changed the original value of the filename option

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        test: /\.(png)$/i,
        use: [
          {
            test: /\.(jpe?g|png|gif|svg)$/i,
            type: 'asset',
          },
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              // PNG images are converted to WEBP, and the originals will keep
              deleteOriginalAssets: false,
              filename: '[path][name].webp',
              minimizerOptions: {
                plugins: ['imagemin-webp'],
              },
            },
          },
        ],
      },
    ],
  },
};

Additional API

`normalizeConfig(config)`

The function normalizes configuration (converts plugins names and options to Functions) for using in imagemin package directly.

const imagemin = require('imagemin');
const { normalizeConfig } = require('image-minimizer-webpack-plugin');
const imageminConfig = normalizeConfig({
  plugins: [
    'jpegtran',
    [
      'pngquant',
      {
        quality: [0.6, 0.8],
      },
    ],
  ],
});

/*
  console.log(imageminConfig);
  =>
  {
    plugins: [Function, Function],
    pluginsMeta: [
      { name: "imagemin-jpegtran", version: "x.x.x", options: {} },
      { name: "imagemin-pngquant", version: "x.x.x", options: { quality: [0.6, 0.8] }
    ]
  }
*/

(async () => {
  const files = await imagemin(['images/*.{jpg,png}'], {
    destination: 'build/images',
    plugins: imageminConfig.plugins,
  });

  console.log(files);
  // => [{data: <Buffer 89 50 4e …>, path: 'build/images/foo.jpg'}, …]
})();

Examples

Optimize images based on size

You can use difference options (like progressive/interlaced and etc) based on image size (example - don't do progressive transformation for small images).

What is progressive image? Answer here.

webpack.config.js

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  minimizer: [
    new ImageMinimizerPlugin({
      // Only apply this one to files equal to or over 8192 bytes
      filter: (source) => {
        if (source.byteLength >= 8192) {
          return true;
        }

        return false;
      },
      minimizerOptions: {
        plugins: [['jpegtran', { progressive: true }]],
      },
    }),
    new ImageMinimizerPlugin({
      // Only apply this one to files under 8192
      filter: (source) => {
        if (source.byteLength < 8192) {
          return true;
        }

        return false;
      },
      minimizerOptions: {
        plugins: [['jpegtran', { progressive: false }]],
      },
    }),
  ],
};

Optimize and transform images to `webp`

const ImageMinimizerPlugin = require('image-minimizer-webpack-plugin');

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minimizerOptions: {
        plugins: ['pngquant'],
      },
    }),
    new ImageMinimizerPlugin({
      deleteOriginalAssets: false,
      filename: '[path][name].webp',
      minimizerOptions: {
        plugins: ['imagemin-webp'],
      },
    }),
  ],
};

Contributing

Please take a moment to read our contributing guidelines if you haven't yet done so.

CONTRIBUTING

License

MIT

« Previous

IgnorePlugin

Internal webpack plugins

ImageMinimizerWebpackPlugin

Getting Started

Standalone Loader

Standalone Plugin

Options

Plugin Options

test

include

exclude

filter

severityError

minimizerOptions

loader

maxConcurrency

filename

deleteOriginalAssets

Loader Options

filter

severityError

minimizerOptions

filename

deleteOriginalAssets

Additional API

normalizeConfig(config)

Examples

Optimize images based on size

Optimize and transform images to webp

Contributing

License

`test`

`include`

`exclude`

`filter`

`severityError`

`minimizerOptions`

`loader`

`maxConcurrency`

`filename`

`deleteOriginalAssets`

`filter`

`severityError`

`minimizerOptions`

`filename`

`deleteOriginalAssets`

`normalizeConfig(config)`

Optimize and transform images to `webp`