Configure server.properties
server.properties is a plain text file with one key=value pair per line, read by the Java Edition server on startup. Every key has a fixed type (boolean, number, text, or a set of options), and getting the type wrong makes the server fall back to that key's default.
Dropping both keys together from 10 to 6 shrinks the loaded area on each axis (from 21×21 to 13×13 chunks around the player), the file's most direct performance knob.
The value gets clamped to the ceiling of 32, the maximum the Java server accepts; nothing above that gets written.
The tool generates 48 keys in total, always in this per-group order (general, world, players, performance, network, resource pack), with a comment header on the first two lines.
It lives in your server's root folder, next to server.jar. It is created automatically the first time the server starts. Stop the server before replacing the file and restart to apply the changes.
view-distance controls how many chunks the server renders for the player to see; simulation-distance controls how far mobs move and redstone works. Since Java Edition 1.18 they are separate keys, and simulation-distance is usually set equal to or lower than view-distance to save processing.
Because it disables the session check against Mojang/Microsoft: any client can connect claiming any username, without proving ownership of that account. It is only safe behind a proxy that already performs that authentication before forwarding the connection.
difficulty only accepts `peaceful`, `easy`, `normal` or `hard`; any other text gets rejected and the key falls back to the `easy` default, the same behavior applies to gamemode with its 4 options.
Yes for most keys: the file is read only at startup, so changes to view-distance, difficulty or max-players require restarting the server process to take effect.
#Minecraft server properties
#Generated by jkit.tools
motd=A Minecraft Server
gamemode=survival
force-gamemode=false
difficulty=easy
hardcore=false
pvp=true
enable-command-block=false
function-permission-level=2
op-permission-level=4
level-name=world
level-seed=
level-type=minecraft:normal
generate-structures=true
allow-nether=true
spawn-monsters=true
spawn-protection=16
max-world-size=29999984
max-players=20
online-mode=true
white-list=false
enforce-whitelist=false
allow-flight=false
player-idle-timeout=0
enforce-secure-profile=true
hide-online-players=false
view-distance=10
simulation-distance=10
max-tick-time=60000
entity-broadcast-range-percentage=100
network-compression-threshold=256
use-native-transport=true
sync-chunk-writes=true
server-port=25565
server-ip=
enable-status=true
enable-rcon=false
rcon.port=25575
rcon.password=
prevent-proxy-connections=false
enable-query=false
query.port=25565
broadcast-console-to-ops=true
broadcast-rcon-to-ops=true
rate-limit=0
resource-pack=
resource-pack-sha1=
resource-pack-prompt=
require-resource-pack=false
The file is generated locally in the browser; nothing is sent to servers.