Macrofab does this for their web tool, from their Github I guess they merge gerber-to-svg with this SVG Stacker:
https://github.com/MacroFab/SVG-Stacker
We use gerber-to-svg (it is the best we've ever worked with) server-side, but we use svg-stacker to generate images for the cases where we need them (thumbnails, printouts, etc.)
On the front-end, we use html5 canvas rather than a pre-stacked SVG.
We use gerber-to-svg (it is the best we've ever worked with) server-side, but we use svg-stacker to generate images for the cases where we need them (thumbnails, printouts, etc.)
On the front-end, we use html5 canvas rather than a pre-stacked SVG.