Startup parameters

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Navigation: Main>Modding>Startup parametersPage updated: Version 40.43

Project Zomboid has customisable startup parameters, as either JVM arguments or game arguments. This can be used to override "vmArgs" in the .json file. JVM arguments must end with a --, even if there are no game arguments.

Create shortcut
  1. Navigate to the game folder
  2. Create a shortcut of the executable file (ProjectZomboid32.exe/ProjectZomboid64.exe)
  3. Add the appropriate Jvm arguments in the "Target:" line
    Example: C:\ProjectZomboid64.exe -Xmx1024m -Xms1024m -- -nosteam
Steam application
  1. Choose the game shortcut in Steam Library
  2. Right-click the game
  3. Select "Properties"
  4. Hit "Set launch options..."

Game arguments

Client & Server

Arguments Description Example
-nosteam Disables Steam integration on client/server.
-cachedir=<path> Sets the path for the game data cache dir. -cachedir="C:\Zomboid"
-modfolders Option to control where mods are loaded from. Any of the 3 keywords may be left out and may appear in any order. -modfolders workshop,steam,mods
-debug Launches the game in debug mode.


Arguments Description Example
+connect <ip:port> Server address to connect, when joining a server using Steam. +connect
+password <password> Server password to connect, when joining a server using Steam. +password ServersPassword
-debugtranslation Writes possible translation issues to homedir "/Zomboid/translationProblems.txt"
-safemode Launches the game with reduced resolution and disables some graphical effects to reduce strain on lower-end graphics cards.
-nosound Disables the game audio


Arguments Description Example
-adminpassword Option to bypasses the enter-a-password prompt when creating a server. -adminpassword YourPasswdXYZ
-servername You can choose a different servername by using this option when starting the server. -servername MySecondServer
-ip <ip> Option to handle multiple network cards. Example: -ip
-port <port> Option which overrides the .ini option "DefaultPort". -port 16261
-udpport <port> Option which overrides the .ini option "UDPPort". -port 16262
-steamvac <true/false> Option to enable/disable VAC on Steam servers. On the server command-line use -steamvac true/false. In the server's INI file, use SteamVAC=true/false.
-steamport1 <port>
-steamport2 <port>
Steam servers require two additional ports to function (I'm guessing they are both UDP ports, but you may need TCP as well). These are in addition to the DefaultPort= setting. These can be specified in two ways: In the server's INI file as SteamPort1= and SteamPort2=. Using command-line options -steamport1 and -steamport2.

JVM arguments

Client & Server

Arguments Description Example
-Xmx Maximum amount of Memory.
(1024m=1Gig, 2048m=2Gig, 4096m=4Gig)
-Xms Initial/Minimum Memory allocation.
(1024m=1Gig, 2048m=2Gig, 4096m=4Gig)
-Dzomboid.steam=<boolean> Disables/enables Steam integration on client/server.
(0=disabled, 1=enabled)
-Duser.home=<path> overwrites the "/Zomboid" homedir to whatever path you want. -Duser.home=C:\Zomboid
-Dsoftreset option to perform a Soft Reset
-Ddebug enables debugging


Arguments Description Example
-Dorg.sqlite.lib.path=<path> Windows users: When the Server starts, a temporary sqlite file will be created in "TEMP", however it will not be deleted after stopping the Server. A way to avoid this is by adding a JVM option -Dorg.sqlite.lib.path=natives and put a copy of the .dll called sqlitejdbc.dll in the server's natives/ directory. It will then use that one instead of extracting the .dll from the .jar file every time. -Dorg.sqlite.lib.path=natives