Nodejs-based tool for optimizing SVG vector graphics files

1.3.0  •  Updated 9 months ago  •  by svg  •  MIT License

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SVG Optimizer is a Nodejs-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.

What it can do

SVGO has a plugin-based architecture, so almost every optimization is a separate plugin.

Today we have:

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

Want to know how it works and how to write your own plugin? Of course you want to. (동작방법)


$ [sudo] npm install -g svgo



  svgo [OPTIONS] [ARGS]

  -h, --help : Help
  -v, --version : Version
  -i INPUT, --input=INPUT : Input file, "-" for STDIN
  -s STRING, --string=STRING : Input SVG data string
  -f FOLDER, --folder=FOLDER : Input folder, optimize and rewrite all *.svg files
  -o OUTPUT, --output=OUTPUT : Output file or folder (by default the same as the input), "-" for STDOUT
  -p PRECISION, --precision=PRECISION : Set number of digits in the fractional part, overrides plugins params
  --config=CONFIG : Config file or JSON string to extend or replace default
  --disable=PLUGIN : Disable plugin by name, "--disable=PLUGIN1,PLUGIN2" for multiple plugins
  --enable=PLUGIN : Enable plugin by name, "--enable=PLUGIN3,PLUGIN4" for multiple plugins
  --datauri=DATAURI : Output as Data URI string (base64, URI encoded or unencoded)
  --multipass : Pass over SVGs multiple times to ensure all optimizations are applied
  --pretty : Make SVG pretty printed
  --indent=INDENT : Indent number when pretty printing SVGs
  -r, --recursive : Use with '-f'. Optimizes *.svg files in folders recursively.
  -q, --quiet : Only output error messages, not regular status messages
  --show-plugins : Show available plugins and exit

  INPUT : Alias to --input
  • with files:

    $ svgo test.svg


    $ svgo *.svg
    $ svgo test.svg -o test.min.svg
    $ svgo test.svg other.svg third.svg
    $ svgo test.svg other.svg third.svg -o test.min.svg -o other.min.svg -o third.min.svg
  • with STDIN / STDOUT:

    $ cat test.svg | svgo -i - -o - > test.min.svg
  • with folder

    $ svgo -f ../path/to/folder/with/svg/files


    $ svgo -f ../path/to/folder/with/svg/files -o ../path/to/folder/with/svg/output
    $ svgo *.svg -o ../path/to/folder/with/svg/output
  • with strings:

    $ svgo -s '<svg version="1.1">test</svg>' -o test.min.svg

    or even with Data URI base64:

    $ svgo -s 'data:image/svg+xml;base64,...' -o test.min.svg
  • with SVGZ:

    from .svgz to .svg:

    $ gunzip -c test.svgz | svgo -i - -o test.min.svg

    from .svg to .svgz:

    $ svgo test.svg -o - | gzip -cfq9 > test.svgz

Other Ways to Use SVGO


SheetJS LLC Fontello


License and Copyright

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

Logo by Yegor Bolshakov.


Weekly Downloads



Last ver 9 months ago
Created 8 years ago
Last commit 4 months ago
3 days between commits


Node version: 12.6.0
404.3K unpacked


MIT License
OSI Approved
0 vulnerabilities


157 contributors
Maintainer, 374 commits, 180 merges, 2 PRs
Kir Belevich
409 commits
Kir Belevich
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