Does it reduce font files now?

No. It outputs the subset plan.

Which characters are included?

Characters found in SVG text nodes.

Can it update @font-face?

That is part of the planned real implementation.

Is SVG Font Subsetter free?

Yes. SVGKit tools are free to use with no account required.

Does SVG Font Subsetter upload my files?

No. The tool runs entirely in your browser, so your files never leave your device.

Will SVG Font Subsetter change how my SVG looks?

With safe defaults it should render identically. Aggressive options can subtly affect edges, so compare renders for important artwork.

Yes. Active content is stripped, which is also the safer choice for SVG from unknown sources.

Yes, but the second pass rarely finds more waste. A file that has already been optimized shrinks very little.

SVGKit

← Browse all toolsSVG Font Subsetter

SVG Font Subsetter

Optimize

Generate a font subsetting plan from text used in SVG.

SVG Font Subsetter

Generate a font subsetting plan from text used in SVG.

Result

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

Page context

Where SVG Font Subsetter fits

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

Subset plan

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

Boundary

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

SVG Font Subsetter applies rendering-safe rules and reports the byte delta so the size-versus-risk trade stays explicit.

What gets removed

Editor metadata, comments, empty and hidden elements, redundant group nesting, default attribute values, and excess decimal precision make up most SVG waste. These are the first targets because removing them rarely changes rendering.

Safety defaults

Rendering-safe options come first: the viewBox, referenced IDs, gradients, filters, and masks survive, while active content such as scripts is removed. Stronger passes exist but deserve a visual check.

How to verify nothing broke

Compare the original and the result at small and large sizes, and confirm anything CSS selectors or animation targets reference still resolves. The byte delta is reported so the size-versus-risk trade stays explicit.

Expected savings

Designer-exported files commonly shrink 20-60%. Hand-written or previously optimized files shrink far less, which is expected rather than a sign the tool missed something.

How to use

Paste SVG. Paste SVG containing text.
Generate subset. Review collected characters and subset steps.
Build subsetting. Connect the plan to a font subsetting engine later.

Frequently asked questions

Does it reduce font files now?: No. It outputs the subset plan.
Which characters are included?: Characters found in SVG text nodes.
Can it update @font-face?: That is part of the planned real implementation.
Is SVG Font Subsetter free?: Yes. SVGKit tools are free to use with no account required.
Does SVG Font Subsetter upload my files?: No. The tool runs entirely in your browser, so your files never leave your device.
Will SVG Font Subsetter change how my SVG looks?: With safe defaults it should render identically. Aggressive options can subtly affect edges, so compare renders for important artwork.
Are scripts removed?: Yes. Active content is stripped, which is also the safer choice for SVG from unknown sources.
Can I run it twice?: Yes, but the second pass rarely finds more waste. A file that has already been optimized shrinks very little.