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npm · #2030 most downloaded on npm
Optimise inline SVG with PostCSS.
Last release 7 days ago
27 Sep 2026
Ships unpredictably
gaps range from 8 days to 8 months
Most releases are documented
notes for 39 of 48 stable releases
Nothing withdrawn
no release was ever pulled
11 years old
70 releases · first in 2015
fix: update postcss-calc in #1970
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.3...cssnano@9.0.4
perf: median 15% speed increase on test fixtures
Use ASCII case-insensitive matching for CSS names and grammar keywords so Unicode lookalikes are preserved, and restrict CSS whitespace normalization to the CSS whitespace set.
Aligns SVG data URI processing with WHATWG URL standards by treating the first # as the fragment delimiter. Non-conforming data URLs (such as those with malformed percent-encoding or where an unencoded # in markup truncates the SVG payload) are left untouched rather than parsed with an internal XML recovery scanner. CSS hex escapes in the URI scheme (for example d\61ta:image/svg+xml) reach the optimizer. SVG data URIs inside CSS Values 4 src(...) functions or url(...) declarations with url-modifiers are optimized while preserving modifiers and comments. Minified declarations also keep their raw value metadata in sync.
Updated dependencies:
One column per quarter.
fix: update color parsing library in #1964
fix: update color parsing library in #1964
fix: update PostCSS and selector parser
fix: update conflict detection and color conversion CSS spec conformance
fix: update PostCSS peer dependency
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.2...cssnano@9.0.3
fix: updae browserslist, mdn-data, autoprefixer
fix(postcss-svgo): better decode encoded SVG
fix: add main and types to package manifests in #1958
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.1...cssnano@9.0.2
fix: update postcss and selector parser
fix: update PostCSS peer dependency
refactor: some small performance gains in #1955
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.0...cssnano@9.0.1
Migrate to ESM and simplify config loading in #1948
Probably backward-compatible for most users. Some changes to configuration loading documented in migration guide.
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.10...cssnano@9.0.0
^22.22.3 || ^24.15.0 || >=26.0. Package subpath imports are no longer supported. See the migration documentation before upgrading.fix(postcss-merge-rules): fix invalid merging in #1893
fix(postcss-merge-rules): fix invalid merging in #1893
fix(postcss-merge-rules): use webref data to perform a merge #1897
fix(postcss-reduce-idents): do not break grid-template-areas in #1898
fix: ensure correct repository URL in published packages in #1900
fix(postcss-merge-longhand): improve longhand merging correctness in #1907
fix(postcss-merge-longhand): add a fuzzer and fix the cases it found in #1914
fix: improve selector minification in #1915
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.5...cssnano@8.0.6
fix(postcss-merge-longhand): fix issues with border merging in #1886
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.4...cssnano@8.0.5
Fix postcs-svgo encoding in #1877
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.3...cssnano@8.0.4
postcss-reduce-initial: update initial properties
packages now define an exports field in package.json. This prevents any file added to the package to automatically be exposed as a possible import. The has been done in a backward compatible way, so you should be able to import every file you did in the previous release.
types have also been regenerated with TypeScript 7.
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.2...cssnano@8.0.3
fix(postcss-svgo): encode chracters in the correct order
fix(postcss-svgo): do not roll our own URI encoding
Our own code, while producing smaller output, might end up producing the wrong encoding, since it does not encode all characters.
chore: regenerate all type definitions with TypeScript 7
chore: regenerate all type definitions with TypeScript 7
fix: update svgo, autoprefixer and postcss
fix: update PostCSS
chore: define package.json exports
chore: update dependencies
Update autoprefixer, browserslist, colordx and postcss
chore: update the postcss peer dependency
ea8e33a: chore: drop Node.js 20 support
ea8e33a: chore: drop Node.js 20 support
Node.js 20 has reached end of life.
### Patch Changes - 7e56dba: fix: update postcss
322ad33: fix: update postcss peer dependency
5674f7a: fix(postcss-svgo): update SVGO
### Minor Changes - 98dd8f6: Update to svgo 4.0
5672148: fix: update PostCSS peer dependency to version without vulnerabilities
759e16e: chore(svgo): update svgo version as svgo 3.3.0 and 3.3.1 contain unintended breaking changes
0d10597: chore: drop support for Node.js 14 and 16
enable “go to definition” via declaration maps
b1aea33: chore: update svgo to 3.2.0
18331a6: fix: update cssnano peer dependency to 8.4.31 to avoid security issue
4e272f88: Upgrade dependency svgo to v3 and increase the minimum supported node version to v14.
feature: add TypeScript type declarations
Publish untranspiled CommonJS source
All notable changes to this project will be documented in this file. See Conventional Commits for commit guidelines.
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Prevent crash when input contains relative URL
Note: Version bump only for package postcss-svgo
Note: Version bump only for package postcss-svgo
Note: Version bump only for package postcss-svgo
Note: Version bump only for package postcss-svgo
js-yaml (#736) (7241049)postcss version is 8.2.1Nothing published for this version
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postcss-merge-longhand incorrect minification of border (border-*) declarations.
postcss-merge-longhand incorrect minification of border (border-*) declarations.postcss-merge-longhand don't explode declarations with custom properties.
postcss-merge-longhand don't explode declarations with custom properties.postcss-colormin now better transform to hsl.browserslist version incompatibility with caniuse-api
browserslist version incompatibility with caniuse-apiWe dropped support for Node 4, now requiring at least Node 6.9.
border-spacing property.U to lowercase for IE <= 11 and Edge <= 15.a { border-style:dotted; border-style:var(--variable) }) correctly.border property with invalid border width value correctly.:-ms-input-placeholder and ::-ms-input-placeholder selectors correctly.all property correctly.url function.data and *-extension:// URLs correctly.all for IE.Includes the new release candidate for postcss-selector-parser 3.
@media \0screen\,screen\9 {} hacks
(thanks to @evilebottnawi).resolveConfig for a Root node without a source property
(thanks to @darthmaim).Since version 4 has been in-development for some time, we thought it would be best to release an alpha version so that we could catch any issues befor
Since version 4 has been in-development for some time, we thought it would be best to release an alpha version so that we could catch any issues before the actual release.
cssnano & its plugins have been upgraded to PostCSS 6.x. Please ensure that for optimal results that you use cssnano with a PostCSS 6 compatible runner & that any other plugins are also using PostCSS 6.
cssnano is now essentially a preset loader and does not contain any built-in
transforms (instead, it delegates to cssnano-preset-default by default).
Due to the new architecture, it's not possible to exclude asynchronous
transforms and run it synchronously, unlike in 3.x. Any transforms that
were "core" modules have now been extracted out into separate packages.
Because of the new preset system, cssnano will not accept any transformation options; these must be set in the preset. The option names remain mostly the same, except some cases where "core" modules have been extracted out:
core is now normalizeWhitespace.reduceBackgroundRepeat is now normalizeRepeatStyle.reduceDisplayValues is now normalizeDisplayValues.reducePositions is now normalizePositions.reduceTimingFunctions is now normalizeTimingFunctions.styleCache is now rawCache.When excluding transforms, we now have an exclude option (in 3.x this was
named disable). Similarly, the safe option was removed; the defaults
are now much less aggressive.
By default, the following transforms are no longer applied to any input CSS. You may see an increased output file size as a result:
autoprefixerpostcss-discard-unusedpostcss-merge-identspostcss-reduce-identspostcss-zindexNote that you can load cssnano-preset-advanced instead which does contain
these transforms.
We no longer detect previous plugins to silently exclude our own, and now
consider this to be an anti-pattern. So postcss-filter-plugins was removed.
We also changed some options to make the default transforms safer:
postcss-minify-font-values: removeAfterKeyword set to false from true.postcss-normalize-url: stripWWW set to false from true.cssnano now does not accept the sourcemap shortcut option; please refer
to the PostCSS documentation on sourcemaps. The quickstart.js file included
with this module will give you a good starting point.
cssnano.process is no longer a custom method; we use the built-in process
method exposed on each PostCSS plugin. The new signature is
cssnano.process(css, postcssOpts, cssnanoOpts), in 3.x it was
cssnano.process(css, cssnanoOpts).
We dropped support for Node 0.12, now requiring at least Node 4.
Finally, cssnano is now developed as a monorepo, due to the fact that some
transforms have a lot of grey area/overlap. Due to this, some modules have
been refactored to delegate responsibility to others, such that duplication
of functionality is minimized. For instance, postcss-colormin will no
longer compress whitespace or compress numbers, as those are handled by
postcss-normalize-whitespace & postcss-convert-values respectively.
clone behaviour. In cases where some utility
has been used by several plugins it is now a separate package, reducing
cssnano's footprint.postcss-colormin &
postcss-reduce-initial were enhanced with different behaviour depending
on which browsers are passed. And now, the footprint for the caniuse-db
dependency is much smaller thanks to caniuse-lite - 7 times smaller as
of this writing. This makes cssnano much faster to download from npm!Nothing published for this version
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