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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,
        },
      },
    },
  ],
};

Default preset includes the following list of plugins:

  • removeDoctype
  • removeXMLProcInst
  • removeComments
  • removeMetadata
  • removeEditorsNSData
  • cleanupAttrs
  • mergeStyles
  • inlineStyles
  • minifyStyles
  • cleanupIDs
  • removeUselessDefs
  • cleanupNumericValues
  • convertColors
  • removeUnknownsAndDefaults
  • removeNonInheritableGroupAttrs
  • removeUselessStrokeAndFill
  • removeViewBox
  • cleanupEnableBackground
  • removeHiddenElems
  • removeEmptyText
  • convertShapeToPath
  • convertEllipseToCircle
  • moveElemsAttrsToGroup
  • moveGroupAttrsToElems
  • collapseGroups
  • convertPathData
  • convertTransform
  • removeEmptyAttrs
  • removeEmptyContainers
  • mergePaths
  • removeUnusedNS
  • sortDefsChildren
  • removeTitle
  • removeDesc

Custom plugin

It's also possible to specify a custom plugin:

const anotherCustomPlugin = require('./another-custom-plugin.js');
module.exports = {
  plugins: [
    {
      name: 'customPluginName',
      type: 'perItem', // 'perItem', 'perItemReverse' or 'full'
      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);

Built-in plugins

Plugin Description Default
cleanupAttrs cleanup attributes from newlines, trailing, and repeating spaces enabled
mergeStyles merge multiple style elements into one enabled
inlineStyles move and merge styles from <style> elements to element style attributes enabled
removeDoctype remove doctype declaration enabled
removeXMLProcInst remove XML processing instructions enabled
removeComments remove comments enabled
removeMetadata remove <metadata> enabled
removeTitle remove <title> enabled
removeDesc remove <desc> enabled
removeUselessDefs remove elements of <defs> without id enabled
removeXMLNS removes the xmlns attribute (for inline SVG) disabled
removeEditorsNSData remove editors namespaces, elements, and attributes enabled
removeEmptyAttrs remove empty attributes enabled
removeHiddenElems remove hidden elements enabled
removeEmptyText remove empty Text elements enabled
removeEmptyContainers remove empty Container elements enabled
removeViewBox remove viewBox attribute when possible enabled
cleanupEnableBackground remove or cleanup enable-background attribute when possible enabled
minifyStyles minify <style> elements content with CSSO enabled
convertStyleToAttrs convert styles into attributes disabled
convertColors convert colors (from rgb() to #rrggbb, from #rrggbb to #rgb) enabled
convertPathData convert Path data to relative or absolute (whichever is shorter), convert one segment to another, trim useless delimiters, smart rounding, and much more enabled
convertTransform collapse multiple transforms into one, convert matrices to the short aliases, and much more enabled
removeUnknownsAndDefaults remove unknown elements content and attributes, remove attributes with default values enabled
removeNonInheritableGroupAttrs remove non-inheritable group's "presentation" attributes enabled
removeUselessStrokeAndFill remove useless stroke and fill attributes enabled
removeUnusedNS remove unused namespaces declaration enabled
prefixIds prefix IDs and classes with the SVG filename or an arbitrary string disabled
cleanupIDs remove unused and minify used IDs enabled
cleanupNumericValues round numeric values to the fixed precision, remove default px units enabled
cleanupListOfValues round numeric values in attributes that take a list of numbers (like viewBox or enable-background) disabled
moveElemsAttrsToGroup move elements' attributes to their enclosing group enabled
moveGroupAttrsToElems move some group attributes to the contained elements enabled
collapseGroups collapse useless groups enabled
removeRasterImages remove raster images disabled
mergePaths merge multiple Paths into one enabled
convertShapeToPath convert some basic shapes to <path> enabled
convertEllipseToCircle convert non-eccentric <ellipse> to <circle> enabled
sortAttrs sort element attributes for epic readability disabled
sortDefsChildren sort children of <defs> in order to improve compression enabled
removeDimensions remove width/height and add viewBox if it's missing (opposite to removeViewBox, disable it first) disabled
removeAttrs remove attributes by pattern disabled
removeAttributesBySelector removes attributes of elements that match a CSS selector disabled
removeElementsByAttr remove arbitrary elements by ID or className disabled
addClassesToSVGElement add classnames to an outer <svg> element disabled
addAttributesToSVGElement adds attributes to an outer <svg> element disabled
removeOffCanvasPaths removes elements that are drawn outside of the viewbox disabled
removeStyleElement remove <style> elements disabled
removeScriptElement remove <script> elements disabled
reusePaths Find duplicated elements and replace them with links disabled

Other Ways to Use SVGO

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License and Copyright

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

Logo by André Castillo.