Command Line Switches

The following table summarizes the command line switches understood by the LTspice executable, ltspice.exe:

Flag	Description
-alt	Set solver to Alternate. Note that this can be overriden by the netlist.
-ascii	Use ASCII .raw files. Seriously degrades program performance.
-b	Run in batch mode. E.g. "ltspice.exe -b deck.cir" will leave the data in file deck.raw
-big	Start as a maximized window.
-encrypt	Encrypt a model library. For 3rd parties wishing to allow people to use libraries without revealing implementation details. Not used by Analog Devices models.
-FastAccess	Batch conversion of a binary .raw file to Fast Access format.
-FixUpSchematicFonts	Convert the font size field of very old user-authored schematic text to the modern default.
-FixUpSymbolFonts	Convert the font size field of very old user-authored symbols to the modern default. See Changelog.txt for application hints.
-ini <path>	Specify an .ini file to use other than %APPDATA%\LTspice.ini
-I<path>	Specify a path to insert in the symbol and file search paths. Must be the last specified option. No space between "-I" and <path> is allowed.
-max	Synonym for -big
-netlist	Batch conversion of a schematic to a netlist.
-norm	Set solver to Normal. Note that this can be overriden by the netlist.
-PCBnetlist	Batch conversion of a schematic to a PCB format netlist.
-Run	Start simulating the schematic opened on the command line without pressing the Run button.
-sync	Update component libraries
-version	Print LTspice version.

In addition to the above command line switches, LTspice accepts two environmental variables. If PASTE_OMEGA is set, the UNICODE capital omega symbol, Ω, is pasted on the clipboard instead of "Ohm." If the environmental variable CAPITAL_KILO is set, LTspice understands you prefer an upper case metric multiplier for all multipliers greater than 1, not just those greater than 1000.