Tiny Online Tools
A fabrication package rarely fails at the fab house for a subtle reason — it fails because a layer was left out of the ZIP, the drill file didn't make it in, or the board outline has a gap where two traced segments don't quite meet. This tool runs those checks before you upload anything.
Drop in a ZIP (auto-extracted) or the loose Gerber and Excellon files together. Every filename is matched to a role — copper, soldermask, silkscreen, solderpaste, outline, drill — using the same filename conventions fab houses themselves rely on. From there it checks: is copper present, is there an outline, is there a drill file, do all layers agree on units (mm vs inch mismatches are a classic source of impossible boards), are there zero-size apertures.
Two checks go further than presence alone. The outline layer's plotted geometry is traced and split into its separate shapes — the board edge plus, often, mounting-hole circles drawn on the same layer — and the largest one is checked for closure: does its last plotted point return to its first? An outline with a gap won't route or route correctly in CAM software. Every drill hit is then checked against that outline's bounding box, catching a hole placed off-board.
Be aware the drill check uses a bounding box, not the true board shape — a concave notch could hide a hole that's technically outside the real edge but inside its rectangle. That trade-off is stated plainly wherever the result appears. Nothing here replaces a fab house's own DRC, but it catches the mistakes that would otherwise come back as a rejected order days later. Everything runs in your browser; the files never leave your machine.