How to change the world type to flat in Minecraft

A flat (superflat) world is ideal for creative builds, testing, or redstone projects. You can set your server to generate a flat world by updating server.properties.

Changing the world type does not affect already generated terrain. To use a flat world, you must generate a new world.

Before you start

Back up your world if you want to keep it.
Make sure you can edit server.properties in your hosting panel.

Set the world type to flat

Stop your Minecraft server.
Open the server.properties file.
Set level-type to minecraft:flat.

Example:

level-type=minecraft:flat

Save the file.

Generate a new flat world

To apply the new world type, you need a new world. Choose one of these options:

Delete the current world folder and start the server.
Change level-name to a new world name and start the server.

When the server starts, it will generate a new flat world.

FAQ

Can I customize flat world layers?

Vanilla servers only allow the default flat preset. To customize layers, use a custom generator-settings value or a plugin that supports presets.

The world is not flat

This usually means the server kept using the old world. Make sure you generated a new world by deleting the world folder or changing level-name.