How to choose world size, difficulty and seed on your Terraria server

Set World Size, Difficulty and World Seed in Settings, Game Settings before the world is created. The server uses them only when it makes a new world: on the first start, or when World Name names a world that does not exist yet. They never change a world you already have.

Set the options

1. Open your server in the panel and click the Settings tab, then Game Settings.
2. Set the options below. Each one saves when you leave the field.
3. If the server already has a world, also change World Name to a new name, so a new world is made. Your current world stays on disk. See How to start a new world on your Terraria server.
4. Restart the server. The Console shows the world being generated, then the ready line.

The options

• A large world takes longer to generate and uses more disk. Big modded worlds on tModLoader take a few minutes.
• A seed gives the same world every time. Leave it empty for a new random one.
• On Terraria Vanilla the seed can use plain letters, numbers, spaces and punctuation, but no accented letters, emoji, double quotes or backslashes.
• Difficulty 3 makes a Journey world, which only Journey characters can join: How to set up Journey mode on your Terraria server.
• Special seeds: How to make a Skyblock or special seed world on your Terraria server.

Good to know

• On Terraria Vanilla and tModLoader there is no world evil setting: the game picks one.
• tModLoader has no seed setting in the panel.
• To read the seed of the world that is running, type seed in the Console (Terraria Vanilla).
• I changed a setting and nothing happened? The world already existed: Terraria server problems and fixes.