PCB net tracer

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Layers

Nets

Drop a board hereOpen a board
.kicad_pcb — nets are read straight out of the file, with real net names and pad references.

Gerber .zip (or the loose files) — Gerbers carry no netlist, so connectivity is recovered from the copper geometry and stitched between layers through the drill file.

Whichever you pick is detected automatically. Everything runs in the browser; a board you open from disk is never uploaded.
or load one from a URL
Paste a GitHub file page and it is read from raw.githubusercontent.com. The same thing works from the address bar as ?url=…, so a link to a board is a link to it already open — repeat ?url= for a loose set of Gerbers.
Reading board…