Many print pipelines, cutting plotters, and downstream vector editors only honor filled shapes - a stroked line with no fill can render as invisible or get dropped entirely. This parses an uploaded SVG in the browser, turns each `<line>` element into a filled polygon that matches its original stroke width and color, and downloads the result. Nothing is uploaded to a server.

When you'd use this

Preparing a line-based icon or diagram for a laser cutter, vinyl cutter, or CNC workflow that reads fill geometry but ignores or mishandles stroke-width.

Fixing an SVG for a renderer or import step that flattens or strips stroke styling, where the visible line width needs to survive as an actual filled shape instead.

What actually gets converted

Only `<line>` elements get true geometric conversion: the tool computes the perpendicular offset from the line's stroke-width and builds a four-point polygon that covers the same visual area, filled with the original stroke color.

Any other element carrying a `stroke` attribute (a path, circle, or rect, for example) is handled more simply - its stroke color is copied into `fill` and the `stroke` attribute is removed. That swaps the color over but doesn't compute real outline geometry for the shape's edges, so a thick stroke on a curved path won't come out looking the same as before.

Frequently asked questions