JSPM

SVGO

SVG Optimizer is a Node.js-based tool for optimizing SVG vector graphics files.

Why?

SVG files, especially those exported from various editors, usually contain a lot of redundant and useless information. This can include editor metadata, comments, hidden elements, default or non-optimal values and other stuff that can be safely removed or converted without affecting the SVG rendering result.

Installation

Via npm:

npm -g install svgo

Via yarn:

yarn global add svgo

CLI usage

Processing single files:

svgo one.svg two.svg -o one.min.svg two.min.svg

Processing directory of svg files, recursively using -f, --folder:

svgo -f ./path/to/folder/with/svg/files -o ./path/to/folder/with/svg/output

Help for advanced usage:

svgo --help

Configuration

SVGO has a plugin-based architecture, separate plugins allows various xml svg optimizations. See built-in plugins. SVGO automatically loads configuration from svgo.config.js or from --config ./path/myconfig.js. Some general options can be configured via CLI.

// svgo.config.js
module.exports = {
  multipass: true, // boolean. false by default
  datauri: 'enc', // 'base64' (default), 'enc' or 'unenc'.
  js2svg: {
    indent: 2, // string with spaces or number of spaces. 4 by default
    pretty: true, // boolean, false by default
  },
  plugins: [
    // set of built-in plugins enabled by default
    'preset-default',

    // enable built-in plugins by name
    'prefixIds',

    // or by expanded notation which allows to configure plugin
    {
      name: 'sortAttrs',
      params: {
        xmlnsOrder: 'alphabetical',
      },
    },
  ],
};

Default preset

When extending default configuration specify preset-default plugin to enable optimisations. Each plugin of default preset can be disabled or configured with "overrides" param.

module.exports = {
  plugins: [
    {
      name: 'preset-default',
      params: {
        overrides: {
          // customize default plugin options
          inlineStyles: {
            onlyMatchedOnce: false,
          },

          // or disable plugins
          removeDoctype: false,
        },
      },
    },
  ],
};

The default preset includes plugins marked with 'Yes' in the plugin list below.

Custom plugin

It's also possible to specify a custom plugin:

const anotherCustomPlugin = require('./another-custom-plugin.js');
module.exports = {
  plugins: [
    {
      name: 'customPluginName',
      params: {
        optionName: 'optionValue',
      },
      fn: (ast, params, info) => {},
    },
    anotherCustomPlugin,
  ],
};

API usage

SVGO provides a few low level utilities.

optimize

The core of SVGO is optimize function.

const { optimize } = require('svgo');
const result = optimize(svgString, {
  // optional but recommended field
  path: 'path-to.svg',
  // all config fields are also available here
  multipass: true,
});
const optimizedSvgString = result.data;

loadConfig

If you write a tool on top of SVGO you might need a way to load SVGO config.

const { loadConfig } = require('svgo');
const config = await loadConfig();

You can also specify a relative or absolute path and customize the current working directory.

const config = await loadConfig(configFile, cwd);

Troubleshooting

SVG won't scale when CSS is applied on it.

Observed Problem: I'm using my SVG files on a website. It looks like the rendered SVG doesn't scale when the dimensions are altered using CSS.

Possible Solution: Try disabling removeViewBox in the configuration. See issue #1128 for details and discussion.

Built-in plugins

Other ways to use SVGO

Donors

SheetJS LLC	Fontello

License and Copyright

This software is released under the terms of the MIT license.

Logo by André Castillo.