Does it change visible artwork?

No. It only updates namespace attributes on the root SVG.

Should inline SVG always include xmlns?

Inline browser SVG can render without it, but standalone SVG files should include the namespace.

Only when xlink:href references are detected.

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Add the standard SVG namespace to root markup and preserve xlink references when needed.

Add the standard SVG namespace to root markup and preserve xlink references when needed.

Choose an SVG file, paste SVG markup, or load the sample to begin.

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SVG Namespace Normalizer adds the standard xmlns attribute to SVG root markup and preserves xlink references when needed.

The tool sets xmlns="http://www.w3.org/2000/svg" on the root element and adds xmlns:xlink when xlink:href references are present.

Namespaces make standalone SVG files more portable across browsers, XML tooling, image pipelines, and build systems.