## SVGO [](https://npmjs.org/package/svgo) [](https://discord.gg/z8jX8NYxrE)
**SVG O**ptimizer 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
```sh
npm -g install svgo
```
or
```sh
yarn global add svgo
```
## CLI usage
```sh
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
```sh
svgo -f ./path/to/folder/with/svg/files -o ./path/to/folder/with/svg/output
```
See help for advanced usage
```sh
svgo --help
```
## Configuration
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.
```js
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](#built-in-plugins). See how to configure them:
```js
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.
```js
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:
- 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
It's also possible to specify a custom plugin:
```js
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.
```js
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.
```js
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](https://github.com/svg/svgo/blob/master/plugins/cleanupAttrs.js) | cleanup attributes from newlines, trailing, and repeating spaces | `enabled` |
| [mergeStyles](https://github.com/svg/svgo/blob/master/plugins/mergeStyles.js) | merge multiple style elements into one | `enabled` |
| [inlineStyles](https://github.com/svg/svgo/blob/master/plugins/inlineStyles.js) | move and merge styles from `