How to change the seed of your Minecraft server

• From a singleplayer world you like: open it and type /seed in the chat. Click the number to copy it.
• From a friend or a video: a seed is a number, sometimes a word. Words work too: Minecraft turns them into a number, and the same word always gives the same world.
• From your current server: type seed in the Console.

A seed gives the same land on the same Minecraft version. Big updates can change terrain generation, so a seed from a video made on an older version may look different on yours.

1. Open the World tab of your server.
2. In the reset card, fill in Seed for the new world. Leave it empty for a random world.
3. Click Reset world and confirm. The panel takes a full backup, deletes the overworld, the Nether and the End, and starts the server with the new seed.
4. Watch the Console while the new world is generated. It takes about a minute.

Your plugins, their settings, the whitelist and your operators stay as they are. Only the world is replaced. Want the old world back? Restore the backup from the Backups tab, as in back up and restore your server.

The Reset tab in the menu is something else: it wipes the whole server, plugins and settings included. For a new seed you only need the World tab.

Doing it yourself is useful when you want to keep the old world folder on the server, or add a data pack before the new world is made.

1. Stop the server.
2. In Files, open server.properties and set level-seed= to your seed, for example level-seed=8675309.
3. Rename the world folder, the name in level-name, which is usually world. Call it world-old, for example. On Paper and Purpur also rename world_nether and world_the_end if you see them.
4. Start the server. It finds no world under that name and generates a new one from your seed.

Changing level-seed without removing the world does nothing. The world keeps the seed it was created with, which is saved inside the world folder.

An old world folder takes up disk space. Download it, or delete it once you are sure you will not need it again.

Two more settings shape a new world. Both are in Settings under Server settings, and like the seed they only apply to land generated after the change.

• World type (level-type): normal, flat, large biomes, amplified, or a single biome.
• Generate structures: villages, temples, strongholds and the rest. Switched off, the world is bare land.

A data pack can change world generation as well. To have it in the new world from the first chunk, use the way by hand above and put the pack in place before the first start; install datapacks shows where it goes.

• Stand where the spawn should be and type /setworldspawn.
• Pre-generate the area players will use, so exploring does not cause lag: pre-generate your world.
• Set a world border if the map should have a fixed size, for example worldborder set 10000.