Import and export
Open LTspice, KiCad, SPICE and Falstad circuits in Spice++, and export SVG, PNG, netlists, Verilog, a bill of materials and waveform data.
Use the import and export buttons in the top bar. The format is detected from the file extension, or you can choose it.
Schematic formats
| Format | Extensions | Import | Export |
|---|---|---|---|
| Spice++ document (Volt JSON) | .volt.json .json | Yes | Yes |
| SPICE netlist | .cir .net .sp .ckt .spice | Yes | Yes |
| LTspice schematic | .asc | Yes | Yes |
| KiCad 6 and later | .kicad_sch | Yes | Yes |
| Falstad / CircuitJS | text or link | Yes | No |
| SVG | .svg | No | Yes |
| PNG at 2× resolution | .png | No | Yes |
| Verilog, structural | .v | No | Yes |
| Bill of materials | .bom.csv | No | Yes |
What carries over
- Spice++ documents
- Exact round trips.
- SPICE netlists
- Keep the circuit but have no drawing, so imports are laid out automatically, with a net label on each named net.
- LTspice and KiCad
- Keep both placement and connections for every part Spice++ knows. Parts it does not know arrive as labelled placeholders with a warning rather than being dropped.
- Falstad
- Paste a circuit as text or as a falstad.com link; compressed links are decoded.
- Verilog
- Describes connectivity only, for checks in tools such as Yosys.
Waveform data
| Format | Extension | Import | Export |
|---|---|---|---|
| CSV | .csv | Yes | Yes |
| LTspice and ngspice raw | .raw | Yes | Yes |
Imported waveforms open in the waveform panel next to your own results, so you can compare a measurement or another simulator's output against Spice++.