SVG Optimizer is a Node.js-based tool for optimizing SVG vector graphics files.
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.
npm -g install svgo
or
yarn global add svgo
svgo one.svg two.svg -o one.min.svg two.min.svg
Or use the --folder
/-f
flag to optimize a whole folder of SVG icons
svgo -f ./path/to/folder/with/svg/files -o ./path/to/folder/with/svg/output
See help for advanced usage
svgo --help
Some options can be configured with CLI though it may be easier to have the configuration in a separate file. SVGO automatically loads configuration from svgo.config.js
or module specified with --config
flag.
module.exports = { multipass: true, // boolean. false by default datauri: 'enc', // 'base64', 'enc' or 'unenc'. 'base64' by default js2svg: { indent: 2, // string with spaces or number of spaces. 4 by default pretty: true, // boolean, false by default }, };
SVGO has a plugin-based architecture, so almost every optimization is a separate plugin. There is a set of built-in plugins. See how to configure them:
module.exports = { plugins: [ // enable a built-in plugin by name 'prefixIds', // or by expanded version { name: 'prefixIds', }, // some plugins allow/require to pass options { name: 'prefixIds', params: { prefix: 'my-prefix', }, }, ], };
The default preset of plugins is fully overridden if the plugins
field is specified. Use preset-default
plugin to customize plugins options.
module.exports = { plugins: [ { name: 'preset-default', params: { overrides: { // customize options for plugins included in preset inlineStyles: { onlyMatchedOnce: false, }, // or disable plugins removeDoctype: false, }, }, }, // enable builtin plugin not included in default preset 'prefixIds', // enable and configure builtin plugin not included in preset { name: 'sortAttrs', params: { xmlnsOrder: 'alphabetical', }, }, ], };
Default preset includes the following list of plugins:
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, ], };
SVGO provides a few low level utilities.
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;
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);
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 |
SheetJS LLC | Fontello |
This software is released under the terms of the MIT license.
Logo by André Castillo.