IDs, defs, and references

Illustrator and Sketch exports often include long random IDs, duplicate definitions, and unused symbols. Cleaning these up is essential for icon sets and any SVG that uses masks, clips, or gradients referenced by id.

SVGO plugins in this topic

Remove unused defs removeUselessDefs
Removes unreferenced items in <defs> (gradients, symbols, paths) after other cleanup passes.
Round/rewrite number lists cleanupListOfValues
Rounds numbers inside space-separated lists (points, viewBox, transforms) for smaller attributes.
Replace duplicate elements with links reusePaths
Replaces duplicate path definitions with <use> references to a single definition.
Sort children of <defs> sortDefsChildren
Sorts children inside <defs> for stable output and improved compressibility.

Try it

Open SVGOMG.net, load your SVG, and toggle the plugins above in the Features panel.

SVGO plugins in this topic

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