Does it reduce font files now?

No. It outputs the subset plan.

Which characters are included?

Characters found in SVG text nodes.

That is part of the planned real implementation.

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Generate a font subsetting plan from text used in SVG.

Generate a font subsetting plan from text used in SVG.

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

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SVG Font Subsetter generates a font subsetting plan from text used in SVG.

The tool collects text content, derives unique characters, and lists the steps for retaining only required glyphs.

It does not rewrite font files yet. Real subsetting needs source font binaries and a subsetting engine.