SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files.

SVG files, especially those exported from vector editors, usually contain a lot of redundant information. This includes editor metadata, comments, hidden elements, default or suboptimal values, and other stuff that can be safely removed or converted without impacting rendering.

You can install SVGO globally through npm, yarn, or pnpm. Alternatively, drop the global flag (global/-g) to use it in your Node.js project.

# npm
npm install -g svgo

# yarn
yarn global add svgo

# pnpm
pnpm add -g svgo

Process single files:

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

Process a directory of files recursively with -r/--recursive and -f/--folder:

svgo -rf path/to/directory_with_svgs -o path/to/output_directory

Help for advanced usage:

svgo --help

SVGO has a plugin architecture. You can read more about all plugins in Plugins | SVGO Documentation, and the default plugins in Preset Default | SVGO Documentation.

SVGO reads the configuration from svgo.config.mjs or the --config path/to/config.mjs command-line option. Some other parameters can be configured though command-line options too.

svgo.config.mjs

export default {
  multipass: false, // boolean
  datauri: 'base64', // 'base64'|'enc'|'unenc'
  js2svg: {
    indent: 4, // number
    pretty: false, // boolean
  },
  plugins: [
    'preset-default', // built-in plugins enabled by default
    'prefixIds', // enable built-in plugins by name

    // enable built-in plugins with an object to configure plugins
    {
      name: 'prefixIds',
      params: {
        prefix: 'uwu',
      },
    },
  ],
};

Instead of configuring SVGO from scratch, you can tweak the default preset to suit your needs by configuring or disabling the respective plugin.

svgo.config.mjs

export default {
  plugins: [
    {
      name: 'preset-default',
      params: {
        overrides: {
          // disable a default plugin
          cleanupIds: false,

          // customize the params of a default plugin
          inlineStyles: {
            onlyMatchedOnce: false,
          },
        },
      },
    },
  ],
};

You can find a list of the default plugins in the order they run in Preset Default | SVGO Documentation.

You can also specify custom plugins:

svgo.config.mjs

import importedPlugin from './imported-plugin';

export default {
  plugins: [
    // plugin imported from another JavaScript file
    importedPlugin,

    // plugin defined inline
    {
      name: 'customPlugin',
      params: {
        paramName: 'paramValue',
      },
      fn: (ast, params, info) => {},
    },
  ],
};

SVGO provides a few low level utilities.

The core of SVGO is optimize function.

import { optimize } from 'svgo';

const result = optimize(svgString, {
  path: 'path-to.svg', // recommended
  multipass: true, // all other config fields are available here
});

const optimizedSvgString = result.data;

If you write a tool on top of SVGO you may want to resolve the svgo.config.mjs file.

import { loadConfig } from 'svgo';

const config = await loadConfig();

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

const config = await loadConfig(configFile, cwd);

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

Logo by André Castillo.