What unused defs get removed from SVG?

Gradients, filters, and symbols that nothing references via url(#...) or use.

Will actively used gradients be kept?

Yes. Only unreferenced defs entries are deleted.

Yes. Run Remove Empty Groups alongside for a leaner tree.

FAQ

Quick answers

What unused defs get removed from SVG?: Gradients, filters, and symbols that nothing references via url(#...) or use.
Will actively used gradients be kept?: Yes. Only unreferenced defs entries are deleted.
Can I combine this with empty-group cleanup?: Yes. Run Remove Empty Groups alongside for a leaner tree.
Is unused-defs cleanup free without uploading?: Yes. Free browser tool.

Source

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React component

React Native (react-native-svg)

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