What shape is the mask?

A white rectangle with a centered black circle cutout.

Can I change the mask?

Yes. Edit the generated mask geometry manually.

No. It applies to the first renderable element.

Edit

Insert an editable SVG mask and apply it to artwork.

Insert an editable SVG mask and apply it to artwork.

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

Page context

SVG Mask Editor inserts an editable SVG mask and applies it to artwork.

The tool inserts a mask named svgkit-editable-mask sized from the SVG viewport and applies it to the first renderable element.

It is a mask starter, not a visual mask painting editor. Future controls can adjust mask geometry interactively.