> ## Documentation Index
> Fetch the complete documentation index at: https://docs.koppar.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Free tools

> Free online KiCad tools at tools.koppar.ai: netlist to schematic, netlist to routed PCB, autorouter, DRC check, board preview, Gerber, IPC-2581 and ODB++.

The same engine that builds boards in the studio runs at [tools.koppar.ai](https://tools.koppar.ai) on files you already have. No account, no install. Upload a file and go.

| Tool | Input | What you get |
| - | - | - |
| [Netlist → Schematic](https://tools.koppar.ai/#schematic) | `.net` | A `.kicad_sch` project: real library symbols, motif-aware placement, a multipage hierarchy for larger designs, and SVG previews. |
| [Netlist → Placed & Routed PCB](https://tools.koppar.ai/#pcb) | `.net` | A full `.kicad_pcb`: board size derived from the parts, placement, routing, and a KiCad DRC report. 1, 2, 4, 6 or 8 copper layers. |
| [Auto-router](https://tools.koppar.ai/#route) | `.kicad_pcb` | The unconnected nets of a placed board routed. Existing copper is preserved by default, zones are refilled, and the result comes back DRC-checked. |
| [DRC check](https://tools.koppar.ai/#drc) | `.kicad_pcb` | KiCad's verdict: errors by type, unconnected items, and the gate errors that matter for fabrication. |
| [Board preview](https://tools.koppar.ai/#render) | `.kicad_pcb` | SVG renders: a composite view plus one image per copper layer. |
| [Gerber / IPC-2581 / ODB++ export](https://tools.koppar.ai/#export) | `.kicad_pcb` | Gerbers with Excellon drill files, IPC-2581 XML, or an ODB++ archive. |
| [Netlist stats & ERC](https://tools.koppar.ai/#netlist-stats) | `.net` | Component, net and pin counts by reference prefix, plus a heuristic electrical-rules check. Instant. |

## Limits

* Fair-use limits apply: a few heavy PCB jobs per day per visitor.
* Routing can take up to 15 minutes. Heavy jobs run in a queue; the page shows your position. Leave the tab open if you like.
* Uploads are deleted after 24 hours.

<Note>
  The tools take KiCad files. A netlist exported from another EDA package in KiCad's `.net` format works too.
</Note>


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