Includes various bug fixes and optimizations for existing plugins.
We're also revamped the documentation for the project. You can find it on svgo.dev!

The frontend for svgo.dev is maintained in svg/svgo.dev, contributions are welcome.
What's Changed
Settings

Remove Comments, introduces preservePatterns parameter. Preserves legal comments by default, same as the previous behavior, but can now be overridden. By @SethFalco in fix(removeComments): make preserving comments a param svg/svgo#1812
Remove Description, set the removeAny parameter to false by default for accessibility. By @SethFalco in fix(removeDesc): removeAny should be disabled by default svg/svgo#1806

Bug Fixes

Remove Raster Images, removes inlined JPEG images. By @abejfehr in Add support for image/jpeg mimetype svg/svgo#1742
Cleanup IDs, correctly handle when 2 IDs have been referenced in a single attribute. By @SethFalco in fix(cleanupIds): handle when 2 ids referenced in one attr svg/svgo#1795
Cleanup IDS, correctly handle when we've encountered a reference to a node that doesn't exist. By @SethFalco in fix(cleanupIds): skip generated ids for malformed references svg/svgo#1817
Inline Styles, treat style prop keys as case-insensitive. By @SethFalco in fix(inlineStyles): case insensitive style props svg/svgo#1797
Inline Styles, remove all classes in multiclass selector. By @SethFalco in fix(inlineStyles): remove all classes in multiclass selector svg/svgo#1801
Inline Styles, ignore empty CSS blocks instead of adding empty style attribute. By @SethFalco in fix(inlineStyles): empty css block created empty attribute svg/svgo#1823
Minify Styles, removes unused class selectors when the document has no classes. By @SethFalco in fix(minifyStyles): pass empty arrays for usage svg/svgo#1800
Prefix IDs, reuse the same prefix when encountering an ID multiple times. By @SethFalco in fix(prefixIds): dynamic functions should produce same prefix for given id svg/svgo#1814
Remove Hidden Elements, stops removing non-rendering elements like masks. By @SethFalco in fix: resolve regression test for removeHiddenElems svg/svgo#1793
Reuse Paths, creates a new ID if the current one is referenced by another element. By @SethFalco in fix(reusePaths): dont reuse id if referenced in href svg/svgo#1784
Reuse Paths, removes redundant defs children after optimization. By @SethFalco in fix(reusePaths): reuse defs tag if exists and remove redundant nodes svg/svgo#1785
Reuse Paths, stops duplicating attributes into the shared definition. By @SethFalco in fix(reusePaths): pass test-regression task svg/svgo#1791
Don't crash on a null, undefined, or empty plugin. Instead, logs a warning and ignore it. By @SethFalco in What is the benefit of stripping viewBox? svg/svgo#1128

SVG Optimization

Convert Transform, omit spaces between functions. By @SethFalco in fix(convertTransform): do not add redundant space between functions svg/svgo#1802
Remove Scripts, removes callbacks (on*) and href attributes with javascript: URIs. By @cakeinpanic and @SethFalco in fix(removeScriptElement): remove link anchors with scripts svg/svgo#1807, fix(removeScriptElement): collapse a tag propertly svg/svgo#1818, feat(removeScriptElement): add all known event types svg/svgo#1819, fix: remove hrefs for unconventional namespaces svg/svgo#1820
Convert One-Stop Gradients, new plugin to convert gradients with one stop to a solid color, disabled by default. By @SethFalco in feat: convert one stop gradients plugin svg/svgo#1790

Performance

Various optimizations for path handling. By @marvinhagemeister in Speed up strongRound by avoiding string casting svg/svgo#1716 and Speed up stringifyNumber svg/svgo#1717

Chores

Revise the README. By @ADTC in Refactor README to be easier to read through svg/svgo#1731
Fix dead link to postcss-svgo in README. By @Lehoczky in chore: update postcss-svgo link svg/svgo#1770
Replace webpack loader library in README as previous was deprecated. By @tanyabouman in README: image-webpack-loader -> image-minimizer-webpack-plugin svg/svgo#1771

Metrics
Before and after using vectors from various sources, with the default preset of each respective version:



SVG
Original
v3.0.2
v3.0.3
Delta




Arch Linux Logo
8.584 KiB
4.748 KiB
4.747 KiB
⬇️ 0.001 KiB


Blobs
50.45 KiB
42.949 KiB
42.949 KiB



Isometric Madness
869.034 KiB
550.829 KiB
550.699 KiB
⬇️ 0.13 KiB


tldr-pages Banner
2.071 KiB
1.07 KiB
1.07 KiB



Wikipedia Logo
161.552 KiB
118.441 KiB
118.441 KiB




Before and after of the browser bundle of each respective version:




v3.0.2
v3.0.3
Delta




svgo.browser.js
643.5 kB
651.7 kB
⬆️ 8.2 kB