Minecraft server.properties generator and reference_

Folder name of the world. Change it to start a fresh world without deleting the old one; the server creates the folder if it is missing.

default world

Seed for a NEW world. Ignored once the world folder exists. Leave empty for a random seed.

default (empty)

World generator for a NEW world. normal is the regular overworld; flat is a superflat build world; amplified is very CPU-heavy to generate.

default minecraft:normal

JSON options for the generator (mainly superflat layers). Leave {} unless you are pasting a superflat preset.

default {}

Whether villages, strongholds, temples and so on generate in new chunks. false makes a near-empty world.

default true

Radius in blocks around spawn that only ops can build in. 0 turns it off. On a friends server it mostly just confuses people who cannot place blocks at spawn.

default 16 · recommended 0

World border radius in blocks. Lower it (e.g. 5000) to keep the world small and backups fast on survival servers.

default 29999984

Whether nether portals work. false keeps players in the overworld (and the end).

default true

Hardcore mode: difficulty is forced to hard and a dead player is banned and becomes a spectator. Cannot be undone per player without the console.

default false

Slot count shown in the server list and enforced on join. Set it to what your RAM and CPU actually handle, not a vanity number; ops can still bypass it only with a plugin.

default 20

Only players listed in whitelist.json can join. Turn it on for any private server; add people with /whitelist add <name>.

default false · recommended true

When true, players already online are kicked the moment they are removed from the whitelist (otherwise they stay until they log out).

default false · recommended true

Verify every player against Mojang's account servers. false lets anyone join under any name, including your admins' names. Only set false behind a proxy like Velocity that does the check for you.

default true · recommended true

Minutes of inactivity before a player is kicked. 0 disables it. Useful on public servers to free slots held by AFK players.

default 0

Require Mojang-signed chat keys, so chat messages are verified and reportable. Turn off only if a mod or proxy breaks chat signing.

default true

Default permission level given by /op. 1 bypasses spawn protection, 2 allows most commands, 3 allows player management (kick/ban), 4 allows /stop and everything else.

default 4

Permission level datapack functions run with. Raise it only if a datapack needs commands that level 2 cannot run.

default 2

Game mode new players start in. Existing players keep their mode unless force-gamemode is on.

default survival

Put every player back into the default gamemode on each join. Handy for build or minigame servers; annoying on survival with trusted creative ops.

default false

peaceful removes hostile mobs and hunger damage; normal is the intended experience; hard adds starvation death, tougher mobs and zombie sieges.

default easy · recommended normal

Whether players can damage each other. Arrows and potions count too. Off is safer for family servers.

default true

Whether hostile mobs spawn at all (difficulty peaceful already stops them).

default true

Whether passive animals spawn. Turning it off does not remove existing animals.

default true

Whether villagers spawn. false makes villages empty.

default true

Stops the vanilla anti-fly kick ("Flying is not enabled on this server"). Needed for creative servers and for modded servers where jetpacks and elytra-like items trigger false kicks. It does not itself give anyone flight.

default false

Allow command blocks to run. Needed for most adventure maps and redstone contraptions that use them.

default false

Hide the player list from the server-list ping. Privacy option for public servers; players still see each other in Tab.

default false

Chunks sent to each player in every direction. Cost grows with the square of the number: 10 loads 441 chunks per player, 8 loads 289, 6 loads 169. 8 looks fine on most servers; above 10 is where RAM and CPU climb fastest.

default 10 · recommended 8

Chunks around each player where mobs, crops and redstone actually tick. The biggest CPU lever in the file: 6 keeps farms and mobs working near players while halving tick work versus 10. Anything above view-distance is wasted.

default 10 · recommended 6

How far away entities are still sent to clients, as a percent of the default. Lowering to 50-80 cuts network traffic and client lag in mob farms and busy spawns.

default 100 · recommended 80

Milliseconds a single tick may take before the watchdog kills the server. -1 disables the watchdog, which modded servers usually need because big world-gen ticks would otherwise crash the server.

default 60000

Seconds after the last player leaves before the server stops ticking the world. -1 keeps ticking (needed if farms must run while nobody is online).

default 60

Write chunks to disk synchronously. Safer against corruption on crash; turning it off gives slightly smoother saves on slow disks. Leave on.

default true

Packets larger than this many bytes are compressed. 256 is a good balance; -1 disables compression (only sensible on a LAN or behind a proxy that compresses).

default 256

Cap on cascading block updates in one tick, a guard against update-suppression and lag machines. -1 removes the cap. Leave the default.

default 1000000

TCP port the server listens on. 25565 is what clients try when no port is given. On a host, the panel assigns it; do not change it there.

default 25565

Bind to one specific network interface. Leave EMPTY on almost every setup; a wrong value makes the server unreachable.

default (empty)

Message of the day shown in the server list. Supports § colour codes; the file stores non-ASCII characters as \uXXXX escapes, which this generator writes for you.

default A Minecraft Server

Enable the GameSpy4 query protocol (UDP) that server-list sites use to read player counts and plugins.

default false

UDP port for the query protocol. Usually the same number as server-port.

default 25565

Enable remote console access over TCP. Anyone with the password has full console control, and RCON is not encrypted. Only enable it if something needs it, and never expose the port publicly.

default false

TCP port for RCON.

default 25575

RCON password, stored in plain text. An empty password means RCON will not start; a weak one is a full-console backdoor. Use a long random string and never share the file with it filled in.Stored in plain text. Use a long random value and never share this file with it filled in.

default (empty)

Answer server-list pings. false makes the server show as offline in the list while still accepting joins.

default true

Kick players whose connecting IP differs from the one Mojang's auth saw, i.e. players behind VPNs/proxies. Also breaks legitimate proxy setups.

default false

Max packets per second a client may send before being kicked. 0 disables it. Rarely needed; plugins do this better.

default 0

Allow this server to accept players transferred from another server via the transfer packet. Leave false unless you run a network that uses it.

default false

Compression for world region files. deflate is smallest; lz4 is faster to read and write at the cost of disk space. Keep deflate unless disk I/O is your bottleneck.

default deflate

Write player IP addresses to the console and log files. Set false for privacy if you share logs.

default true

Direct download URL of a resource pack clients are offered on join. Must be a direct .zip link.

default (empty)

SHA-1 hash of the pack file, so clients cache it correctly and re-download when it changes. Lowercase hex.

default (empty)

Optional UUID identifying the pack (needed only if you manage several packs).

default (empty)

Disconnect players who decline the resource pack.

default false

Custom message shown in the resource pack prompt (JSON text component or plain text).

default (empty)

Comma-separated datapacks enabled when a NEW world is created. Add experimental packs here, e.g. vanilla,update_1_21.

default vanilla

Comma-separated datapacks explicitly disabled on world creation.

default (empty)

URL shown to players in the pause menu's bug-report button.

default (empty)

Show ops the output of commands run from the console.

default true

Show ops the output of commands run over RCON.

default true

Use Linux epoll for networking, which is faster. Ignored on other OSes; leave on.

default true

Expose tick timing over JMX for monitoring tools. Off unless you attach a profiler.

default false

Config for a chat text-filtering service. Empty on almost every server.

default (empty)

Version of the text-filtering config format. Leave 0.

default 0

Extra debug logging. Off.

default false